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        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>John Werner</PersonNm>
        <TitleTxt>Segment Alternate</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Phil Williams</PersonNm>
        <TitleTxt>Segment Alternate</TitleTxt>
        <AverageHoursPerWeekRt>1.50</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>HB Doggett</PersonNm>
        <TitleTxt>Director; President and CEO</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>625522</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>60653</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Sallie P Day</PersonNm>
        <TitleTxt>VP Governance, Risk &amp; Compliance &amp; COO</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>244230</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>59773</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Jerome Dreyer</PersonNm>
        <TitleTxt>Senior VP and CIO</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>313030</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>60285</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Theresa Gage</PersonNm>
        <TitleTxt>VP External Affairs &amp; Corporate Communication</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>200026</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>36460</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Bradley C Jones</PersonNm>
        <TitleTxt>SVP and COO</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>244562</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>55068</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Vickie Leady</PersonNm>
        <TitleTxt>Asst. GC and Asst. Corp. Sec.</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>180091</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>42071</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>William Magness</PersonNm>
        <TitleTxt>General Counsel, Senior VP of Governance Risk &amp; Co</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>542249</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>62807</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Charles B Manning</PersonNm>
        <TitleTxt>COO &amp; Executive Advisor</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>310255</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>32069</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Kenneth McIntyre</PersonNm>
        <TitleTxt>VP Grid Planning and Operations</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>111314</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>19117</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Kenan Ogleman</PersonNm>
        <TitleTxt>VP Commercial Operations</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>52355</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>8877</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Michael Petterson</PersonNm>
        <TitleTxt>VP and CFO</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>242322</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>56883</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Dwayne Rickerson</PersonNm>
        <TitleTxt>VP Grid Planning and Operations</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>193799</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>49567</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Diane M Williams</PersonNm>
        <TitleTxt>VP Human Resources</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>245438</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>54348</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Stephen Daniels</PersonNm>
        <TitleTxt>Director Application Services</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <KeyEmployeeInd>X</KeyEmployeeInd>
        <ReportableCompFromOrgAmt>204637</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>44704</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Bryan Hanley</PersonNm>
        <TitleTxt>Director Information Technology Architecture</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <KeyEmployeeInd>X</KeyEmployeeInd>
        <ReportableCompFromOrgAmt>191626</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>48286</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Mark Ruane</PersonNm>
        <TitleTxt>Director Market Credit</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <KeyEmployeeInd>X</KeyEmployeeInd>
        <ReportableCompFromOrgAmt>242657</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>43052</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Dan Woodfin</PersonNm>
        <TitleTxt>Director System Operations</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <KeyEmployeeInd>X</KeyEmployeeInd>
        <ReportableCompFromOrgAmt>192616</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>49390</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>James Brenton</PersonNm>
        <TitleTxt>Principal Regional Security</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>203562</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>30100</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>David Forfia</PersonNm>
        <TitleTxt>Director IT Architecture</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>213916</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>54555</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Chad Seely</PersonNm>
        <TitleTxt>Assistant General Counsel</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>216027</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>50214</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Jeychander Tamby</PersonNm>
        <TitleTxt>Chief of Staff</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>281839</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>64033</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>William Wullenjohn</PersonNm>
        <TitleTxt>Director Internal Audit</TitleTxt>
        <AverageHoursPerWeekRt>45.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>274603</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>52205</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>5966281</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>1034517</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>406</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Allegis Group Services Inc</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>7301 Parkway Drive</AddressLine1Txt>
            <CityNm>Hanover</CityNm>
            <StateAbbreviationCd>MD</StateAbbreviationCd>
            <ZIPCd>21076</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Contingent Workforce</ServicesDesc>
        <CompensationAmt>5262319</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Potomac Economics Ltd</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>9990 Fairfax Blvd Suite 560</AddressLine1Txt>
            <CityNm>Fairfax</CityNm>
            <StateAbbreviationCd>VA</StateAbbreviationCd>
            <ZIPCd>22030</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Independent mkt monitor</ServicesDesc>
        <CompensationAmt>3658333</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Siemens Industry Inc</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>10900 Wayzata Blvd</AddressLine1Txt>
            <CityNm>Minnetonka</CityNm>
            <StateAbbreviationCd>MN</StateAbbreviationCd>
            <ZIPCd>55305</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>IT Consulting</ServicesDesc>
        <CompensationAmt>1831402</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>ABB Inc</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1601 Industrial Blvd</AddressLine1Txt>
            <CityNm>Sugarland</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>774782579</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>IT Consulting</ServicesDesc>
        <CompensationAmt>1674109</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Alstom Grid Inc</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 88808</AddressLine1Txt>
            <CityNm>Chicago</CityNm>
            <StateAbbreviationCd>IL</StateAbbreviationCd>
            <ZIPCd>606951808</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>It Consulting</ServicesDesc>
        <CompensationAmt>1156118</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>16</CntrctRcvdGreaterThan100KCnt>
      <ProgramServiceRevenueGrp>
        <Desc>Electric Reliability Program Serv</Desc>
        <BusinessCd>221000</BusinessCd>
        <TotalRevenueColumnAmt>148444075</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>148444075</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>Municipal Service Program Revenue</Desc>
        <BusinessCd>221000</BusinessCd>
        <TotalRevenueColumnAmt>32242891</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>32242891</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>Membership Dues</Desc>
        <BusinessCd>221000</BusinessCd>
        <TotalRevenueColumnAmt>324100</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>324100</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>181011066</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>39725</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>39271</RelatedOrExemptFuncIncomeAmt>
        <ExclusionAmt>454</ExclusionAmt>
      </InvestmentIncomeGrp>
      <GrossAmountSalesAssetsGrp>
        <OtherAmt>314974</OtherAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <OtherAmt>0</OtherAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <OtherAmt>314974</OtherAmt>
      </GainOrLossGrp>
      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>314974</TotalRevenueColumnAmt>
        <ExclusionAmt>314974</ExclusionAmt>
      </NetGainOrLossInvestmentsGrp>
      <OtherRevenueMiscGrp>
        <Desc>Non-Operating Income</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>49345</TotalRevenueColumnAmt>
        <ExclusionAmt>49345</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>49345</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>181415110</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>181050337</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>364773</ExclusionAmt>
      </TotalRevenueGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>5559741</TotalAmt>
        <ProgramServicesAmt>2983546</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2576195</ManagementAndGeneralAmt>
      </CompCurrentOfcrDirectorsGrp>
      <OtherSalariesAndWagesGrp>
        <TotalAmt>66941781</TotalAmt>
        <ProgramServicesAmt>56844498</ProgramServicesAmt>
        <ManagementAndGeneralAmt>10097283</ManagementAndGeneralAmt>
      </OtherSalariesAndWagesGrp>
      <PensionPlanContributionsGrp>
        <TotalAmt>9779056</TotalAmt>
        <ProgramServicesAmt>8455012</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1324044</ManagementAndGeneralAmt>
      </PensionPlanContributionsGrp>
      <OtherEmployeeBenefitsGrp>
        <TotalAmt>10862307</TotalAmt>
        <ProgramServicesAmt>8969681</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1892626</ManagementAndGeneralAmt>
      </OtherEmployeeBenefitsGrp>
      <PayrollTaxesGrp>
        <TotalAmt>6103878</TotalAmt>
        <ProgramServicesAmt>5358074</ProgramServicesAmt>
        <ManagementAndGeneralAmt>745804</ManagementAndGeneralAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>291966</TotalAmt>
        <ManagementAndGeneralAmt>291966</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>269000</TotalAmt>
        <ManagementAndGeneralAmt>269000</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>9245538</TotalAmt>
        <ProgramServicesAmt>8633103</ProgramServicesAmt>
        <ManagementAndGeneralAmt>612435</ManagementAndGeneralAmt>
      </FeesForServicesOtherGrp>
      <OfficeExpensesGrp>
        <TotalAmt>1240485</TotalAmt>
        <ProgramServicesAmt>707669</ProgramServicesAmt>
        <ManagementAndGeneralAmt>532816</ManagementAndGeneralAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>3326483</TotalAmt>
        <ProgramServicesAmt>3289854</ProgramServicesAmt>
        <ManagementAndGeneralAmt>36629</ManagementAndGeneralAmt>
      </InformationTechnologyGrp>
      <OccupancyGrp>
        <TotalAmt>5461020</TotalAmt>
        <ManagementAndGeneralAmt>5461020</ManagementAndGeneralAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>1164970</TotalAmt>
        <ProgramServicesAmt>765956</ProgramServicesAmt>
        <ManagementAndGeneralAmt>399014</ManagementAndGeneralAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>1370218</TotalAmt>
        <ProgramServicesAmt>961524</ProgramServicesAmt>
        <ManagementAndGeneralAmt>408694</ManagementAndGeneralAmt>
      </ConferencesMeetingsGrp>
      <InterestGrp>
        <TotalAmt>1807259</TotalAmt>
        <ManagementAndGeneralAmt>1807259</ManagementAndGeneralAmt>
      </InterestGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>21916982</TotalAmt>
        <ProgramServicesAmt>17314416</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4602566</ManagementAndGeneralAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>1947933</TotalAmt>
        <ProgramServicesAmt>1947933</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>Hardware and Software E</Desc>
        <TotalAmt>19778675</TotalAmt>
        <ProgramServicesAmt>19498331</ProgramServicesAmt>
        <ManagementAndGeneralAmt>280344</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Reliability Organizatio</Desc>
        <TotalAmt>14703597</TotalAmt>
        <ManagementAndGeneralAmt>14703597</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>Dues and Subscriptions</Desc>
        <TotalAmt>1678814</TotalAmt>
        <ProgramServicesAmt>1236259</ProgramServicesAmt>
        <ManagementAndGeneralAmt>442555</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>All other expenses</Desc>
        <TotalAmt>55748</TotalAmt>
        <ProgramServicesAmt>1804</ProgramServicesAmt>
        <ManagementAndGeneralAmt>53944</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>183505451</TotalAmt>
        <ProgramServicesAmt>136967660</ProgramServicesAmt>
        <ManagementAndGeneralAmt>46537791</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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      <CashNonInterestBearingGrp>
        <BOYAmt>527770</BOYAmt>
        <EOYAmt>889457</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
        <BOYAmt>723285159</BOYAmt>
        <EOYAmt>670012393</EOYAmt>
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      <AccountsReceivableGrp>
        <BOYAmt>5534224</BOYAmt>
        <EOYAmt>4638209</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>16295860</BOYAmt>
        <EOYAmt>17032368</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>853214360</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>734739634</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>147401842</BOYAmt>
        <EOYAmt>118474726</EOYAmt>
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      <OtherAssetsTotalGrp>
        <BOYAmt>243885</BOYAmt>
        <EOYAmt>220970</EOYAmt>
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      <TotalAssetsGrp>
        <BOYAmt>893288740</BOYAmt>
        <EOYAmt>811268123</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>12703915</BOYAmt>
        <EOYAmt>12196762</EOYAmt>
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      <DeferredRevenueGrp>
        <BOYAmt>4177524</BOYAmt>
        <EOYAmt>3865794</EOYAmt>
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      <EscrowAccountLiabilityGrp>
        <BOYAmt>352818678</BOYAmt>
        <EOYAmt>356687553</EOYAmt>
      </EscrowAccountLiabilityGrp>
      <MortgNotesPyblScrdInvstPropGrp>
        <BOYAmt>71000000</BOYAmt>
        <EOYAmt>67000000</EOYAmt>
      </MortgNotesPyblScrdInvstPropGrp>
      <OtherLiabilitiesGrp>
        <BOYAmt>442967934</BOYAmt>
        <EOYAmt>363900645</EOYAmt>
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      <TotalLiabilitiesGrp>
        <BOYAmt>883668051</BOYAmt>
        <EOYAmt>803650754</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsSFAS117Ind>X</OrganizationFollowsSFAS117Ind>
      <UnrestrictedNetAssetsGrp>
        <BOYAmt>9620689</BOYAmt>
        <EOYAmt>7617369</EOYAmt>
      </UnrestrictedNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>9620689</BOYAmt>
        <EOYAmt>7617369</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>893288740</BOYAmt>
        <EOYAmt>811268123</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>-2090341</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>87021</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <AgentTrusteeEtcInd>0</AgentTrusteeEtcInd>
      <InclEscrowCustodialAcctLiabInd>1</InclEscrowCustodialAcctLiabInd>
      <ExplanationProvidedInd>X</ExplanationProvidedInd>
      <LandGrp>
        <OtherCostOrOtherBasisAmt>947096</OtherCostOrOtherBasisAmt>
        <BookValueAmt>947096</BookValueAmt>
      </LandGrp>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>82397479</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>30706127</DepreciationAmt>
        <BookValueAmt>51691352</BookValueAmt>
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      <LeaseholdImprovementsGrp>
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        <DepreciationAmt>8151853</DepreciationAmt>
        <BookValueAmt>19604</BookValueAmt>
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      <EquipmentGrp>
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        <DepreciationAmt>104089142</DepreciationAmt>
        <BookValueAmt>15067647</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>642541539</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>591792512</DepreciationAmt>
        <BookValueAmt>50749027</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>118474726</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>CRRAH/QSE Security Deposits</Desc>
        <Amt>363548754</Amt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>Accr. Post Ret. Benefit Obligation</Desc>
        <Amt>320293</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Deferred Rent Costts</Desc>
        <Amt>31598</Amt>
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      <TotalLiabilityAmt>363900645</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueSubtotalAmt>181415110</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
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      <ExpensesNotRptFinclStmtAmt>87021</ExpensesNotRptFinclStmtAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IV, Line 2b:</FormAndLineReferenceDesc>
        <ExplanationTxt>ERCOT IS THE CENTRAL COUNTERPARTY FOR ALL TRANSACTIONS SETTLED BY ERCOT PURSUANT TO ERCOT PROTOCOLS AND IS DEEMED TO BE THE SOLE BUYER TO EACH SELLER, AND THE SOLE SELLER TO EACH BUYER, OF ALL ENERGY, ANCILLARY SERVICES, RELIABILITY UNIT COMMITMENTS (RUCS), EMERGENCY RESPONSE SERVICE (ERS), AND OTHER PRODUCTS OR SERVICES FOR WHICH ERCOT MAY PAY OR CHARGE A MARKET PARTICIPANT, EXPECT FOR THOSE PRODUCTS OR SERVICES PROCURED THROUGH BILATERAL TRANSACTIONS BETWEEN MARKET PARTICIPANTS AND THOSE PRODUCTS OR SERVICES THAT ARE SELF-ARRANGED BY MARKET PARTICIPANTS. ERCOT PERFORMS SETTLEMENTS FOR ALL TRANSACTIONS SUBJECT TO THE FINANCIAL SETTLEMENT PROCESS IN ACCORDANCE WITH ERCOT PROTOCOLS. THE SETTLEMENT PROCESS IS USED TO RESOLVE FINANCIAL OBLIGATIONS FOR MARKET SERVICES PROCURED THROUGH ERCOT FOR REGISTERED MARKET PARTICIPANTS. ADDITIONALLY, AS REQUIRED BY ERCOT PROTOCOLS, ERCOT EXECUTES AUCTIONS FOR CONGESTION REVENUE RIGHTS MONTHLY AND ANNUALLY AND DISTRIBUTES PROCEEDS FROM THESE AUCTIONS TO MARKET PARTICIPANTS AS REQUIRED BY ERCOT PROTOCOLS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>ERCOT IS EXEMPT FROM FEDERAL INCOME TAX UNDER SECTION 501(A) OF THE INTERNAL REVENUE CODE AS AN ORGANIZATION DESCRIBED IN SECTION 501(C)(4). THE COMPANY IS ALSO EXEMPT FROM STATE INCOME TAXES. ACCORDINGLY, NO PROVISION FOR INCOME TAXES OR UNCERTAIN TAX POSITIONS HAS BEEN REFLECTED IN THE FINANCIAL STATEMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 4b - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Deferred Pension Costs 87,021.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <IndependentConsultantInd>X</IndependentConsultantInd>
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
      <WrittenEmploymentContractInd>X</WrittenEmploymentContractInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>1</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>HB Doggett</PersonNm>
        <TitleTxt>Director; President and CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>625522</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>35800</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>24853</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>686175</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Sallie P Day</PersonNm>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
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        <DeferredCompensationFlngOrgAmt>35844</DeferredCompensationFlngOrgAmt>
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        <TotalCompensationFilingOrgAmt>304003</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Jerome Dreyer</PersonNm>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>38840</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>21445</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>373315</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Theresa Gage</PersonNm>
        <TitleTxt>VP External Affairs &amp; Corporate Comm</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>29000</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>7460</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>236486</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Bradley C Jones</PersonNm>
        <TitleTxt>SVP and COO</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>36100</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>18968</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Vickie Leady</PersonNm>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>26524</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>15547</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>222162</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>William Magness</PersonNm>
        <TitleTxt>General Counsel, Senior VP of Govern</TitleTxt>
        <BaseCompensationFilingOrgAmt>395173</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>147076</BonusFilingOrganizationAmount>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>37990</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>24817</NontaxableBenefitsFilingOrgAmt>
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        <TotalCompensationFilingOrgAmt>605056</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Charles B Manning</PersonNm>
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        <NontaxableBenefitsFilingOrgAmt>6618</NontaxableBenefitsFilingOrgAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Michael Petterson</PersonNm>
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        <TotalCompensationFilingOrgAmt>299205</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Dwayne Rickerson</PersonNm>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>28208</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>21359</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>243366</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Diane M Williams</PersonNm>
        <TitleTxt>VP Human Resources</TitleTxt>
        <BaseCompensationFilingOrgAmt>245438</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>36018</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>18330</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>299786</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Stephen Daniels</PersonNm>
        <TitleTxt>Director Application Services</TitleTxt>
        <BaseCompensationFilingOrgAmt>204637</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>20797</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>23907</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>249341</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Bryan Hanley</PersonNm>
        <TitleTxt>Director Information Technology Arch</TitleTxt>
        <BaseCompensationFilingOrgAmt>191626</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>28150</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>20136</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>239912</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Mark Ruane</PersonNm>
        <TitleTxt>Director Market Credit</TitleTxt>
        <BaseCompensationFilingOrgAmt>242657</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>35503</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>7549</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>285709</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Dan Woodfin</PersonNm>
        <TitleTxt>Director System Operations</TitleTxt>
        <BaseCompensationFilingOrgAmt>192616</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>28016</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>21374</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>242006</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>James Brenton</PersonNm>
        <TitleTxt>Principal Regional Security</TitleTxt>
        <BaseCompensationFilingOrgAmt>203562</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>28711</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>1389</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>233662</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>David Forfia</PersonNm>
        <TitleTxt>Director IT Architecture</TitleTxt>
        <BaseCompensationFilingOrgAmt>213916</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>31599</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>22956</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>268471</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Chad Seely</PersonNm>
        <TitleTxt>Assistant General Counsel</TitleTxt>
        <BaseCompensationFilingOrgAmt>216027</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>23171</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>27043</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>266241</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Jeychander Tamby</PersonNm>
        <TitleTxt>Chief of Staff</TitleTxt>
        <BaseCompensationFilingOrgAmt>281839</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>39266</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>24767</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>345872</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>William Wullenjohn</PersonNm>
        <TitleTxt>Director Internal Audit</TitleTxt>
        <BaseCompensationFilingOrgAmt>193966</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>80637</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>28446</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>23759</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>326808</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 4a</FormAndLineReferenceDesc>
        <ExplanationTxt>Pursuant to an agreement with ERCOT, Charles Manning received a severance payment of $149,972, William Wullenjohn received a severance payment of $80,637, and Kenneth McIntyre received a severance payment of $24,958 in 2015.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleL documentId="RetDoc1042800001">
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <BusinessName>
            <BusinessNameLine1Txt>Brazos Electric Power Cooperative</BusinessNameLine1Txt>
          </BusinessName>
        </NameOfInterested>
        <RelationshipDescriptionTxt>See Part V Below</RelationshipDescriptionTxt>
        <TransactionAmt>203016569</TransactionAmt>
        <TransactionDesc>See Part V Below</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <BusinessName>
            <BusinessNameLine1Txt>South Texas Electric Cooperative</BusinessNameLine1Txt>
          </BusinessName>
        </NameOfInterested>
        <RelationshipDescriptionTxt>See Part V Below</RelationshipDescriptionTxt>
        <TransactionAmt>54022817</TransactionAmt>
        <TransactionDesc>See Part V Below</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <BusinessName>
            <BusinessNameLine1Txt>American Electric Power</BusinessNameLine1Txt>
          </BusinessName>
        </NameOfInterested>
        <RelationshipDescriptionTxt>See Part V Below</RelationshipDescriptionTxt>
        <TransactionAmt>244819</TransactionAmt>
        <TransactionDesc>See Part V Below</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule L, Part IV - (1)(b)</FormAndLineReferenceDesc>
        <ExplanationTxt>CLIFTON KARNEI WAS A 2015 BOARD MEMBER OF ERCOT (COOPERATIVE MARKET SEGMET DIRECTOR) AND ALSO AN OFFICER OF BRAZOS ELECTRIC POWER COOPERATIVE, INC. (1)(D) PAYMENT OF GOVERNMENTALLY-APPROVED TARIFF, ANCILLARY SERVICE FEES, AND MEMBERSHIP FEES. (2)(B) MIKE KEZAR WAS A 2015 BOARD MEMBER OF ERCOT (COOPERATIVE MARKET SEGMENT ALTERNATE) AND ALSO THE GENERAL MANAGER OF SOUTH TEXAS ELECTRIC COOPERATIVE, INC. (2)(D) PAYMENT OF GOVERNMENTALLY-APPROVED TARIFF, ANCILLARY FEES, AND MEMBERSHIP FEES. (3)(B) WADE SMITH WAS A 2015 BOARD MEMBER OF ERCOT (INVESTOR-OWNED UTILITY MARKET SEGMENT ALTERNATE) AND ALSO PRESIDENT AND COO OF AEP TEXAS. (3)(D) PAYMENT OF GOVERNMENTALLY-APPROVED TARIFF, ANCILLARY SERVICE FEES, AND MEMBERSHIP FEES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I, LINE 1</FormAndLineReferenceDesc>
        <ExplanationTxt>ELECTRIC RELIABILITY COUNCIL OF TEXAS, INC. (ERCOT) LESSENS THE BURDENS OF GOVERNMENT, SERVES THE PUBLIC INTEREST BY, AND FULFILLS ITS STATUTORY OBLIGATION BY: (I) ENSURING OPEN ACCESS TO TRANSMISSION AND DISTRIBUTION SYSTEMS; (II) MAINTAINING SYSTEM RELIABILITY AND OPERATIONS; (III) ENABLING RETAIL CHOICE; OPERATING FAIR AND COMPETITIVE WHOLESALE MARKETS; (IV) MAINTAINING THE RENEWABLE ENERGY CREDITS REGISTRY; AND (V) PROVIDING LEADERSHIP AND INDEPENDENT EXPERTISE TO IMPROVE SYSTEM RELIABILITY AND MARKET EFFICIENCY. ERCOT MANAGES THE FLOW OF ELECTRIC POWER TO 24 MILLION TEXAS CUSTOMERS - REPRESENTING ABOUT 90 PERCENT OF THE STATE'S ELECTRIC LOAD. AS THE INDEPENDENT SYSTEM OPERATOR FOR THE REGION, ERCOT SCHEDULES POWER ON AN ELECTRIC GRID THAT CONNECTS MORE THAN 43,000 MILES OF TRANSMISSION LINES AND 550 GENERATION UNITS. ERCOT ALSO PERFORMS FINANCIAL SETTLEMENT FOR THE COMPETITIVE WHOLESALE BULK-POWER MARKET AND ADMINISTERS RETAIL SWITCHING FOR 7 MILLION PREMISES IN COMPETITIVE CHOICE AREAS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 1</FormAndLineReferenceDesc>
        <ExplanationTxt>PURSUANT TO SECTION 39.151 OF THE TEXAS PUBLIC UTILITY REGULATORY ACT, THE ERCOT BOARD OF DIRECTORS IS COMPOSED OF SIXTEEN MEMBERS. FIFTEEN OF THE MEMBERS HAVE VOTING RIGHTS; THE CHAIR OF THE PUBLIC UTILITY COMMISSION OF TEXAS IS AN EX-OFFICIO NON-VOTING MEMBER. SIX OF THE VOTING DIRECTORS REPRESENT SEGMENTS OF INDUSTRY IN THE ERCOT ELECTRICITY MARKET; EACH SUCH "MARKET SEGMENT DIRECTOR" HAS AN ELECTED ALTERNATE (SEGMENT ALTERNATE) WHO CAN ATTEND MEETINGS IN THE ABSENCE OF THE MARKET SEGMENT DIRECTOR AND VOTE ON THE ABSENT MARKET SEGMENT DIRECTOR'S BEHALF IN THE EVENT THAT SUCH MARKET SEGMENT DIRECTOR CANNOT ATTEND A BOARD MEETING. THREE OF THE OTHER VOTING DIRECTORS REPRESENT SUBSEGMENTS OF A SEVENTH SEGMENT (I.E., THE CONSUMER SEGMENT), BUT THEY DO NOT HAVE ANY RESPECTIVE SEGMENT ALTERNATES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>AS OF DECEMBER 31, 2015, ERCOT'S MEMBERHIP INCLUDED 293 VOTING AND NON-VOTING MEMBERS. ERCOT MEMBERS MAY BE CORPORATE MEMBERS, ASSOCIATE MEMBERS, OR ADJUNCT MEMBERS. CORPORATE MEMBERS HAVE THE RIGHT TO VOTE ON ALL MATTERS SUBMITTED TO THE GENERAL MEMBERSHIP [SUCH AS ELECTION OF DIRECTORS, ELECTION OF TECHNICAL ADVISORY COMMITTEE (TAC) REPRESENTATIVES, AND AMENDMENTS TO THE ARTICLES OF INCORPORATION AND BYLAWS]. CORPORATE MEMBERS QUALIFY IN ONE OF SEVEN SEGMENTS: COOPERATIVE; INDEPENDENT GENERATOR; INDEPENDENT POWER MARKETER; INDEPENDENT RETAIL ELECTRIC PROVIDER; INVESTOR OWNED UTILITY; MUNICIPAL (I.E. A MUNICIPAL-OWNED UTILITY OR A RIVER AUTHORITY); OR CONSUMER (WHICH HAS SUBSEGMENTS INCLUDING COMMERCIAL, INDUSTRIAL, AND RESIDENTIAL). ASSOCIATE AND ADJUNCT MEMBERS DO NOT HAVE THE RIGHT TO VOTE ON ANY MATTER SUBMITTED TO THE GENERAL MEMBERSHIP, AND ADJUNCT MEMBERS DO NOT HAVE THE RIGHT TO BE ELECTED OR APPOINTED TO THE ERCOT BOARD, TAC, OR ANY SUBCOMMITTEE OF THE BOARD OR TAC.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>THIRTEEN OF THE FIFTEEN VOTING MEMBERS OF THE ERCOT BOARD OF DIRECTORS ARE ELECTED, OR APPOINTED IN LIMITED CIRCUMSTANCES, BY THE CORPORATE MEMBERS OR A PORTION OF SUCH CORPORATE MEMBERS. WITH RESPECT TO EACH OF THE SIX MARKET SEGMENT DIRECTORS WHO DO NOT REPRESENT THE CONSUMER SUBSEGMENTS, ONLY THE CORPORATE MEMBERS OF THE MEMBERSHIP SEGMENT REPRESENTED BY THE MARKET SEGMENT DIRECTOR ARE ALLOWED TO ELECT THE DIRECTOR AND THE SEGMENT ALTERNATE FOR THAT SEAT. THERE ARE THREE CONSUMER DIRECTORS, OF WHICH: (I) ONE IS THE PUBLIC COUNSEL, AN EX OFFICIO VOTING MEMBER OF THE BOARD WHO IS DESIGNATED TO REPRESENT THE RESIDENTIAL CONSUMERS AND SMALL COMMERCIAL CONSUMERS; (II) ONE IS ELECTED OR APPOINTED BY THE LARGE COMMERCIAL CONSUMER CORPORATE MEMBERS; AND (III) ONE IS ELECTED BY THE CORPORATE MEMBERS OF THE INDUSTRIAL CONSUMER SUBSEGMENT. THE MEMBERSHIP VOTES BY SEGMENT TO ELECT THE FIVE UNAFFILIATED VOTING DIRECTORS. THE REMAINING VOTING DIRECTOR IS THE CHIEF EXECUTIVE OFFICER OF ERCOT, WHO IS AN EX OFFICIO VOTING MEMBER OF THE BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>AS A MATTER OF STATE LAW OR ITS GOVERNING DOCUMENTS, CERTAIN MATERIAL MATTERS MUST BE SUBMITTED TO THE VOTING MEMBERS OF ERCOT FOR THEIR APPROVAL, INCLUDING AMENDMENTS TO THE ARTICLES OF INCORPORATION AND THE BYLAWS. DECISIONS OF THE ERCOT BOARD ARE GENERALLY APPEALABLE TO THE PUBLIC UTILITY COMMISSION OF TEXAS, AN AGENCY OF THE STATE OF TEXAS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11</FormAndLineReferenceDesc>
        <ExplanationTxt>THE 2015 FORM 990 WAS PREPARED INITIALLY BY THE FINANCE DEPARTMENT OF ERCOT. IT WAS REVIEWED BY ERCOT OFFICERS AS WELL AS INTERNAL LEGAL COUNSEL, AND THEN SUBMITTED FOR REVIEW BY ERCOT'S INDEPENDENT AUDITORS. THE FORM 990 WAS PROVIDED TO THE BOARD OF DIRECTORS IN ADVANCE OF, AND FOR ITS CONSIDERATION AND INPUT AT ITS MEETING ON JUNE 14, 2016. THE FINAL VERSION OF THE 2015 FORM 990, INCORPORATING THE COMMENTS OF ALL FOREGOING, WAS THEN FILED WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH DIRECTOR AND SEGMENT ALTERNATE ANNUALLY MUST EXECUTE AN ETHICS AGREEMENT FOR DIRECTORS AND SEGMENT ALTERNATES, AND EACH EMPLOYEE ANNUALLY MUST ATTEND INTERNAL TRAINING SESSIONS AND EXECUTE AN EMPLOYEE ETHICS AGREEMENT. PURSUANT TO EACH ETHICS AGREEMENT, A SIGNATORY HAS AN AFFIRMATIVE DUTY TO DISCLOSE ANY ACTUAL OR POTENTIAL CONFLICTS OF INTEREST OF THE SIGNATORY (AND HIS OR HER EMPLOYER, IN THE CASE OF DIRECTORS OR SEGMENT ALTERNATIVES), AND ALSO MUST DISCLOSE ALL PERSONAL RELATIONSHIPS WITH ERCOT VENDORS, INCLUDING BUSINESS OR DIRECT OR INDIRECT OWNERSHIP INTERESTS. ANY CONFLICT OF INTEREST ISSUE INVOLVING A DIRECTOR OR SEGMENT ALTERNATE IS REFERRED TO THE ERCOT GENERAL COUNSEL WHO, IN CONSULTATION WITH THE BOARD CHAIR AND OUTSIDE LEGAL COUNSEL, IF AND WHEN NECESSARY, MAKES A LEGAL DETERMINATION AS TO WHETHER A CONFLICT EXISTS AND, IF SO, A RECOMMENDATION AS TO HOW IT MAY BE RESOLVED. ANY CONFLICT AND ITS RESOLUTION ARE REPORTED TO BOTH THE HUMAN RESOURCE &amp; GOVERNANCE (HR&amp;G) COMMITTEE OF THE BOARD AND THE FULL BOARD OF DIRECTORS. ANY OBJECTION TO THE RECOMMENDATION IS RESOLVED BY THE HR&amp;G COMMITTEE OR THE FULL BOARD. ANY ERCOT EMPLOYEE CONFLICTS ARE EVALUATED BY THE ERCOT LEGAL STAFF, AND THE LEGAL STAFF MAKES A RECOMMENDATION TO RESOLVE THE CONFLICT OF INTEREST. IF THE ERCOT LEGAL STAFF RECOMMENDS A RESOLUTION THAT IS OBJECTIONABLE TO THE MANAGER/DIRECTOR/OFFICER OF THE CONFLICTED EMPLOYEE, THE LEGAL DECISION IS REFERRED TO THE CHIEF EXECUTIVE OFFICER AND ULTIMATELY TO THE BOARD'S HR&amp;G COMMITTEE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>IN DETERMINING COMPENSATION FOR THE CHIEF EXECUTIVE OFFICER, ERCOT FOLLOWS A PROCEDURE WHICH ENSURES THAT (I) COMPENSATION IS, IN ADVANCE, RECOMMENDED BY THE HR&amp;G COMMITTEE OF THE BOARD OF DIRECTORS AND APPROVED BY THE BOARD ITSELF, (II) THE BOARD AND THE HR&amp;G COMMITTEE OBTAINS AND RELIES UPON APPROPRIATE DATA FOR COMPARABILITY, (III) THE BOARD AND THE HR&amp;G COMMITTEE EACH ADEQUATELY DOCUMENTS THE BASIS FOR ITS RESPECTIVE DETERMINATION, AND (IV) THE CEO COMPENSATION IS SUBJECT TO REVIEW AND APPROVAL BY THE PUBLIC UTILITY COMMISSION OF TEXAS. IN PRACTICE, THE HR&amp;G COMMITTEE OF THE BOARD OF DIRECTORS REVIEWS PROPOSED CHANGES TO CHIEF EXECUTIVE OFFICER COMPENSATION AND SUBMITS RECOMMENDATIONS TO THE BOARD FOR ITS APPROVAL BY ALL UNINTERESTED MEMBERS OF THE BOARD OF DIRECTORS (THAT IS, ALL BOARD MEMBERS EXCEPT THE CHIEF EXECUTIVE OFFICER WHO IS REQUIRED TO ABSTAIN FROM SUCH VOTE). AS PART OF ITS REVIEW, THE HR&amp;G COMMITTEE CAN REQUEST INFORMATION FROM INDEPENDENT COMPENSATION CONSULTANTS, AND IT RECEIVES INFORMATION ANNUALLY IN REGARDS TO THE COMPENSATION LEVELS OF SIMILAR ORGANIZATIONS FROM PUBLICLY-AVAILABLE INFORMATION CONTAINED IN FORMS 990 AND OTHER SOURCES. ADDITIONALLY, COMPENSATION SURVEYS/STUDIES ARE PERFORMED, AS NEEDED, TO PROVIDE INSIGHT INTO THE ELEMENTS OF COMPENSATION. THE HR&amp;G COMMITTEE RECOMMENDATIONS ARE DISCUSSED WITH AND SUBMITTED TO THE BOARD OF DIRECTORS FOR ITS CONSIDERATION AND APPROVAL. A REVIEW OF THE CHIEF EXECUTIVE OFFICER'S COMPENSATION IS PERFORMED ANNUALLY EXCEPT IN THOSE LIMITED INSTANCES IN WHICH THE COMPENSATION HAS BEEN DETERMINED PURSUANT TO THE PROVISIONS OF AN EMPLOYMENT AGREEMENT FOR A TERM EXCEEDING A YEAR BETWEEN ERCOT AND THE CHIEF EXECUTIVE OFFICER, WHICH HAS BEEN APPROVED BY THE BOARD OF DIRECTORS, AND ALL DECISIONS REGARDING THE CHIEF EXECUTIVE OFFICER'S COMPENSATION ARE DOCUMENTED AND MAINTAINED. FURTHERMORE, THE PUBLIC UTILITY COMMISSION OF TEXAS SUBSTANTIVE RULES RELATED TO ERCOT GOVERNANCE REQUIRES THAT CHIEF EXECUTIVE OFFICER COMPENSATION IS SUBJECT TO THE REVIEW AND APPROVAL OF THE PUBLIC UTILITY COMMISSION OF TEXAS. 15(B) IN DETERMINING COMPENSATION FOR OFFICERS OTHER THAN THE CHIEF EXECUTIVE OFFICER, ERCOT FOLLOWS A PROCEDURE WHICH ENSURES THAT (I) COMPENSATION IS FULLY DISCLOSED IN ADVANCE TO THE HR&amp;G COMMITTEE OF THE BOARD OF DIRECTORS, (II) THE HR&amp;G COMMITTEE OBTAINS AND RELIES UPON APPROPRIATE DATA FOR COMPARABILITY, AND (III) THE HR&amp;G COMMITTEE ADEQUATELY DOCUMENTS THE BASIS FOR ITS DETERMINATION. THE CHIEF EXECUTIVE OFFICER REPORTS PROPOSED OFFICER PAY AMOUNTS TO THE HR&amp;G COMMITTEE FOR REVIEW AND COMMENT BEFORE ANY MERIT INCREASE IS FINALIZED. KEY EMPLOYEE COMPENSATION IS REVIEWED AND DETERMINED BY THEIR APPROPRIATE OFFICER. FOR REVIEW OF OFFICER AND KEY EMPLOYEE COMPENSATION, ERCOT USES MERIT RATINGS AND DATA OBTAINED RELATING TO COMPARABLE COMPENSATION OF SIMILARLY QUALIFIED PERSONS IN COMPARABLE POSITIONS AT COMPARABLE ORGANIZATIONS, INCLUDING COMPENSATION SURVEYS AND FORMS 990. THE HR&amp;G COMMITTEE CAN REQUEST INFORMATION FROM INDEPENDENT COMPENSATION CONSULTANTS. OFFICER AND KEY EMPLOYEE COMPENSATION IS REVIEWED ANNUALLY, AND ALL DECISIONS REGARDING OFFICER AND KEY EMPLOYEE COMPENSATION ARE DOCUMENTED AND MAINTAINED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ERCOT's governing documents, conflict of interest policy, and audited financial statements are available to the public through the ERCOT website (www.ercot.com).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, line 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>Deferred pension costs 87,021.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>