SOUTHERN CALIFORNIA EDISON COMPANY

UNITED STATES OF AMERICA BEFORE THE FEDERAL ENERGY REGULATORY COMMISSION Southern California Edison Company ) Docket No. ER18- -000 SOUTHERN CALIFORNIA EDISON COMPANY ANNUAL UPDATE FILING OF THE TRANSMISSION ACCESS CHARGE BALANCING ACCOUNT ADJUSTMENT MARCH 2018

Karen Koyano Principal Manager FERC Rates & Compliance March 28, 2018 Ms. Kimberly D. Bose, Secretary Federal Energy Regulatory Commission 888 First Street, N.E. Washington, DC 20426 Dear Ms. Bose: Pursuant to Section 35.13 of the Federal Energy Regulatory Commission's ( Commission ) Regulations under the Federal Power Act (18 CFR 35.13), Southern California Edison Company ( SCE ) tenders for filing revisions to its Transmission Owner Tariff ("TO Tariff"), FERC Electric Tariff, Volume No. 6, to update the Transmission Access Charge Balancing Account Adjustment ( TACBAA ) Rate to be effective June 1, 2018. The documents submitted with this filing consist of this letter of transmittal and all attachments hereto; a revised Appendix III to the TO Tariff reflecting the revised TACBAA Rate proposed in this filing in both clean and redline formats; the Prepared Direct Testimony of Robert Mindess; the relevant Statements required under the Commission s Regulations; and workpapers supporting the rate revision proposed herein. I. DESCRIPTION OF TACBAA REVISION The TO Tariff specifies, among other things, the rates and charges for transmission access over the California Independent System Operator Corporation ("CAISO") Controlled Grid. 1 One such rate and charge is the TACBAA Rate. The TACBAA is a ratemaking mechanism designed to ensure that the cost-shift amounts billed by the ISO to SCE under the ISO s Transmission Access Charge ( TAC ) structure will be recovered from SCE s End-Use Customers. Section 5.6 of the TO Tariff describes the items to be included in the Transmission 1 Capitalized terms that have not been expressly defined herein have the same meaning as given to them in SCE s TO Tariff. P.O. Box 800 2244 Walnut Grove Ave. Rosemead, CA 91770

Ms. Kimberly D. Bose, Secretary Federal Energy Regulatory Commission Page 2 March 28, 2018 Access Charge Balancing Account ( TACBA ) and sets forth the procedure for revising the TACBAA Rate on an annual basis to be effective on June 1. The TACBAA Rate is based on the balance in the TACBA as of the end of February prior to the commencement of the June billing cycle and a forecast of the net annual TAC billings by the CAISO. The revised TACBAA Rate applicable to SCE s End-Use Customers effective June 1, 2018 is negative $0.00033 per kilowatt-hour. This revision represents a smaller negative rate from the current negative $0.00100 per kilowatt-hour TACBAA Rate in effect, thereby reducing the overall credit to customers. This increase in the TACBAA Rate is primarily due to a larger forecast of ISO TAC billings relative to last year. SCE s proposed increase to the TACBAA Rate is described in the Prepared Testimony included with this filing. II. REVENUE INCREASE The forecast annualized transmission revenue increase resulting from the implementation of the revised TACBAA Rate by retail rate group effective June 1, 2018 is shown in the table below. The increase to the TACBAA Rate does not affect any wholesale customers under SCE s TO Tariff. TACBAA Rate Revenue Change ($) Domestic $18,382,514 Lighting, Small & Medium Power $18,724,512 Large Power $15,272,564 Agricultural & Pumping $2,163,925 Street Lighting $486,538 Total $55,030,052 The revenue forecast by month is set forth in Statements BG and BH.

Ms. Kimberly D. Bose, Secretary Federal Energy Regulatory Commission Page 3 March 28, 2018 III. REQUESTED ACTION AND EFFECTIVE DATE SCE respectfully requests that the revised TACBAA Rate proposed herein be accepted and made effective on June 1, 2018. IV. OTHER FILING REQUIREMENTS No expenses or costs included in the rates tendered herein have been alleged or judged in any administrative or judicial proceeding to be illegal, duplicative or unnecessary costs that are demonstrably the product of discriminatory employment practices. SCE believes that the information contained in this filing provides a sufficient basis upon which to accept this filing; however, to the extent necessary, SCE further requests that the Commission waive its filing requirements contained in Part 35 of its regulations to the extent necessary in order to permit this filing to be made effective as requested. SCE believes this filing conforms to any rule of general applicability and to any Commission order specifically applicable to SCE, and has made copies of this letter and all enclosures available for public inspection in SCE's principal office located in Rosemead, California. SCE has mailed copies of this filing to the California Public Utilities Commission and the CAISO.

FEDERAL ENERGY REGULATORY COMMISSION MAILING LIST ANNUAL TACBAA UPDATE FILING NAME Arocles Aguilar General Counsel California Public Utilities Commission ADDRESS 505 Van Ness Avenue San Francisco, California 94102 Arocles.Aguilar@cpuc.ca.gov Anthony Ivancovich Deputy General Counsel - Regulatory California Independent System Operator Corporation 250 Outcropping Way Folsom, California 95630 aivancovich@caiso.com

REVISIONS TO TRANSMISSION OWNER TARIFF (IN CLEAN FORMAT)

APPENDIX III TRANSMISSION RATES FOR END-USE SERVICE Base transmission rates for service to End-Use Customers shall be determined pursuant to the formula rate in Appendix IX. SCE shall post the base transmission rates applicable to each End-User rate schedule on its website: www.sce.com. In addition, the following transmission rates shall apply to service provided to End-Use Customers: A TRBAA Rate of ($0.00144)/kWh shall apply to all End-User rate schedules A TACBAA Rate of ($0.00033)/kWh shall apply to all End-User rate schedules Tariff Record Proposed Effective Date: 06/01/2018 Version Number: 16.0.0 Option Code: A

REVISIONS TO TRANSMISSION OWNER TARIFF (IN REDLINE FORMAT)

APPENDIX III TRANSMISSION RATES FOR END-USE SERVICE Base transmission rates for service to End-Use Customers shall be determined pursuant to the formula rate in Appendix IX. SCE shall post the base transmission rates applicable to each End-User rate schedule on its website: www.sce.com. In addition, the following transmission rates shall apply to service provided to End-Use Customers: A TRBAA Rate of ($0.00144)/kWh shall apply to all End-User rate schedules A TACBAA Rate of ($0.00033100)/kWh shall apply to all End-User rate schedules 061/01/2018 165.0.0 Tariff Record Proposed Effective Date: Version Number: Option Code: A

UNITED STATES OF AMERICA BEFORE THE FEDERAL ENERGY REGULATORY COMMISSION Southern California Edison Company ) Docket No. ER18- -000 PREPARED DIRECT TESTIMONY OF ROBERT MINDESS ON BEHALF OF SOUTHERN CALIFORNIA EDISON COMPANY MARCH 2018

Southern California Edison Company Docket No. ER18- -000 Exhibit No. SCE-1 Page 1 UNITED STATES OF AMERICA BEFORE THE FEDERAL ENERGY REGULATORY COMMISSION Southern California Edison Company ) Docket No. ER18- -000 PREPARED DIRECT TESTIMONY OF ROBERT MINDESS ON BEHALF OF SOUTHERN CALIFORNIA EDISON COMPANY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 QUALIFICATIONS Q. Please state your name and business address for the record. A. My name is Robert Mindess, and my business address is 8631 Rush Street, Rosemead, California 91770-3714. Q. Briefly describe your present responsibilities at the Southern California Edison Company ( SCE or Company ). A. I am a Senior Advisor, Rates in the FERC Rates and Regulation Division of the Regulatory Affairs Department. My primary responsibilities include developing costs and rates for services that are under the jurisdiction of the Federal Energy Regulatory Commission ( FERC ). Q. Briefly describe your educational and professional background. A. I received a Bachelor of Arts Degree in biology from the University of Colorado at Boulder, Colorado, and a Juris Doctor Degree from the Whittier College School of Law in Los Angeles, California. I have been a

Southern California Edison Company Docket No. ER18- -000 Exhibit No. SCE-1 Page 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 member of the California and Washington D.C. bars since 1993. I have been employed at SCE since 2007 in various positions, including Contract Manager and Project Manager, and have been in my present role since April 22, 2013. Q. Have you testified before the Commission previously? A. Yes. I have submitted testimony in SCE s most recent transmission rate case proceeding (Docket No. ER18-169). PURPOSE OF TESTIMONY Q. What is the purpose of your testimony in this proceeding? A. The purpose of my testimony is to present SCE s Transmission Access Charge Balancing Account Adjustment ( TACBAA ) Rate proposed to become effective June 1, 2018. Q. What is the TACBAA? A. The TACBAA is a ratemaking mechanism, set forth in Section 5.6 of SCE s Transmission Owner Tariff ( TO Tariff ), that ensures that the difference between the billings to SCE by the California Independent System Operator Corporation ( CAISO ) under the CAISO s Transmission Access Charge ( TAC ) rate methodology and revenues recovered from SCE s End-Use Customers ( Net Cost-Shift ) is recovered from End-Use Customers. The Net Cost-Shift is caused by the CAISO billing SCE at its TAC rate which includes all Transmission Revenue Requirements ( TRR )

Southern California Edison Company Docket No. ER18- -000 Exhibit No. SCE-1 Page 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 of all Participating Transmission Owners ( Participating TOs ). Whereas SCE s charges to SCE s End-Use Customers is based only on its utility specific rate. Q. How does the TACBAA mechanism operate? A. An integral part of the TACBAA is the Transmission Access Charge Balancing Account ( TACBA ). The TACBA tracks the difference, including interest, between the Net Cost-Shift billings from the CAISO and the revenues received by SCE from End-Use Customers through the assessment of the TACBAA Rate. Under the TO Tariff, the TACBAA Rate is to be updated annually to reflect the accrued balance in SCE s TACBA as of the end of February prior to the commencement of the June billing cycle, plus a forecast of the annual Net Cost-Shift billings by the CAISO to SCE. This mechanism is required because the Net Cost-Shift amount is very difficult to accurately forecast over time, as it is impossible to predict when new Participating TOs will decide to join the CAISO and to estimate the level of their TRRs. The Net Cost-Shift amount billed to SCE by the CAISO under the TAC also can fluctuate greatly due to changing TRRs and changes to the Gross Load of the present Participating TOs. Q. Please describe SCE s proposed TACBAA Rate for 2018/2019. A. As shown in Statement BL and Appendix III of the revised TO Tariff, SCE proposes a TACBAA Rate of negative $0.00033 per kwh effective June 1,

Southern California Edison Company Docket No. ER18- -000 Exhibit No. SCE-1 Page 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 2018. This rate is an increase from the currently-effective TACBAA Rate of negative $0.00100 per kwh. This proposed rate was developed by combining the TACBA over-collection balance of negative $58.599 million as of February 28, 2018, the current annualized Net Cost-Shift forecast amount of positive $31.23 million, plus an adjustment for franchise fees and uncollectible accounts expense of negative $0.32 million, and dividing that sum by SCE s Gross Load at the meter for the twelve-month period ended February 28, 2018. Q. How did you develop the Net Cost-Shift forecast for 2018? A. I utilized the difference in SCE s high voltage utility specific rate and the CAISO s latest TAC rate 1 (posted on the CAISO s website), multiplied by SCE s estimated gross load. Q. Does this conclude your testimony? A. Yes. 1 A copy of the CAISO s calculation is included in the workpapers for this filing.

COST OF SERVICE STATEMENTS AH, BD, BG, BH, BK, AND BL

Statement AH Page 1 of 1 Southern California Edison Company Operation and Maintenance Expenses (Transmission Access Charge Billings)* Period II June 2018 through May 2019 Line No. Month Net TAC Billing 1 June $2,602,659 2 July $2,602,659 3 August $2,602,659 4 September $2,602,659 5 October $2,602,659 6 November $2,602,659 7 December $2,602,659 8 January $2,602,659 9 February $2,602,659 10 March $2,602,659 11 April $2,602,659 12 May $2,602,659 13 14 SubTotal $31,231,903 15 * Net Transmission Access Charges are recorded in Account 566.

Statement BD Page 1 of 1 Southern California Edison Company Allocation Energy and Supporting Data Period II June 2018 through May 2019 Monthly Energy Use by End-Use Customer Group (MWh)* Lighting, Small Agricultural Street Line No. Month Domestic & Medium Power Large Power & Pumping Lighting Total 1 June 2,452,037 2,279,124 1,882,194 200,508 63,923 6,877,785 2 July 1,875,531 1,930,011 1,661,396 163,789 59,844 5,690,571 3 August 2,095,665 2,201,447 1,855,309 201,042 62,401 6,415,863 4 September 1,888,645 2,142,446 1,791,151 227,881 59,863 6,109,985 5 October 2,055,212 2,312,296 1,927,979 281,670 59,908 6,637,066 6 November 2,160,926 2,349,257 1,928,019 324,318 58,319 6,820,839 7 December 2,689,407 2,529,463 1,945,412 361,938 57,900 7,584,120 8 January 3,075,310 2,833,233 2,204,027 396,242 59,216 8,568,028 9 February 2,642,807 2,406,508 1,859,257 323,397 57,579 7,289,549 10 March 2,452,239 2,612,062 2,067,701 312,809 61,801 7,506,612 11 April 1,940,632 2,211,677 1,874,321 235,007 61,816 6,323,454 12 May 2,108,177 2,139,508 1,798,106 201,136 63,606 6,310,534 13 14 Total 27,436,588 27,947,032 22,794,871 3,229,738 726,177 82,134,406 15 16 * Monthly Energy use at meter.

Statement BG Page 1 of 1 Southern California Edison Company Statement of Proposed Rate Revenues* Period II June 2018 through May 2019 Monthly TACBAA Revenue by End-Use Customer Group Lighting, Small Agricultural Street Total Line No. Month Domestic & Medium Power Large Power & Pumping Lighting TACBAA 1 June ($809,172) ($752,111) ($621,124) ($66,167) ($21,095) ($2,269,669) 2 July ($618,925) ($636,904) ($548,261) ($54,050) ($19,749) ($1,877,888) 3 August ($691,569) ($726,478) ($612,252) ($66,344) ($20,592) ($2,117,235) 4 September ($623,253) ($707,007) ($591,080) ($75,201) ($19,755) ($2,016,295) 5 October ($678,220) ($763,058) ($636,233) ($92,951) ($19,770) ($2,190,232) 6 November ($713,106) ($775,255) ($636,246) ($107,025) ($19,245) ($2,250,877) 7 December ($887,504) ($834,723) ($641,986) ($119,440) ($19,107) ($2,502,760) 8 January ($1,014,852) ($934,967) ($727,329) ($130,760) ($19,541) ($2,827,449) 9 February ($872,126) ($794,148) ($613,555) ($106,721) ($19,001) ($2,405,551) 10 March ($809,239) ($861,980) ($682,341) ($103,227) ($20,394) ($2,477,182) 11 April ($640,409) ($729,853) ($618,526) ($77,552) ($20,399) ($2,086,740) 12 May ($695,698) ($706,038) ($593,375) ($66,375) ($20,990) ($2,082,476) 13 14 Total ($9,054,074) ($9,222,521) ($7,522,307) ($1,065,814) ($239,638) ($27,104,354) * The proposed TACBAA Rate is -0.00033 $/kwh

Statement BH Page 1 of 1 Southern California Edison Company Statement of Present Rate Revenues* Period II June 2018 through May 2019 Monthly TACBAA Revenue by End-Use Customer Group Lighting, Small Agricultural Street Total Line No. Month Domestic & Medium Power Large Power & Pumping Lighting TACBAA 1 June ($2,452,037) ($2,279,124) ($1,882,194) ($200,508) ($63,923) ($6,877,785) 2 July ($1,875,531) ($1,930,011) ($1,661,396) ($163,789) ($59,844) ($5,690,571) 3 August ($2,095,665) ($2,201,447) ($1,855,309) ($201,042) ($62,401) ($6,415,863) 4 September ($1,888,645) ($2,142,446) ($1,791,151) ($227,881) ($59,863) ($6,109,985) 5 October ($2,055,212) ($2,312,296) ($1,927,979) ($281,670) ($59,908) ($6,637,066) 6 November ($2,160,926) ($2,349,257) ($1,928,019) ($324,318) ($58,319) ($6,820,839) 7 December ($2,689,407) ($2,529,463) ($1,945,412) ($361,938) ($57,900) ($7,584,120) 8 January ($3,075,310) ($2,833,233) ($2,204,027) ($396,242) ($59,216) ($8,568,028) 9 February ($2,642,807) ($2,406,508) ($1,859,257) ($323,397) ($57,579) ($7,289,549) 10 March ($2,452,239) ($2,612,062) ($2,067,701) ($312,809) ($61,801) ($7,506,612) 11 April ($1,940,632) ($2,211,677) ($1,874,321) ($235,007) ($61,816) ($6,323,454) 12 May ($2,108,177) ($2,139,508) ($1,798,106) ($201,136) ($63,606) ($6,310,534) 13 14 Total ($27,436,588) ($27,947,032) ($22,794,871) ($3,229,738) ($726,177) ($82,134,406) * The currently effective TACBAA Rate is -0.001 $/kwh

Statement BK Page 1 of 1 Southern California Edison Company Electric Utility Cost of Service Calculation of Revised Transmission Access Charge Balancing Account Adjustment Effective June 1, 2018 Period II June 2018 through May 2019 Line No. Description Total 1 Balance in TACBA on February 28, 2018 ($58,599,073) 2 Including Interest 3 4 Forecast ISO TAC Billings $31,231,903 5 6 Revised TACBAA Before Franchise Fees and ($27,367,170) 7 Uncollectable Accounts 8 9 Adjustment for Franchise Fees and ($317,733) 10 Uncollectable Accounts at 1.161% 11 12 Revised TACBAA For End-Use Customers ($27,684,903)

Southern California Edison Company Rate Design Information Transmission Access Charge Balancing Account Adjustment Rate Period II Effective June 1, 2018 Purpose: The purpose of the TACBAA Rate is to flow-through to End-Use Customers the Transmission Access Charge cost shift billed by the California Independent System Operator Statement BL Page 1 of 1 Line No. Description Total 1 Revised TACBAA For End-Use Customers ($27,684,903) 2 Effective June 1, 2018 3 4 Gross Load (kwh) 84,936,893,000 5 Twelve-months ended February 2018 6 7 TACBAA Rate for End Use Customers ($/kwh) ($0.00033) 8 (Line 1/Line 4)

WORKPAPERS

WORKPAPERS TABLE OF CONTENTS Statement AH 1 Statement BD 7 Statement BK 9 Statement BL 12

March 1, 2018 TAC Rates Based on Filed Annual TRR/TRBA and Load Data TAC Components: Filed HV Utility Filed Annual Gross Specific Rate TAC Rate TAC Amount Annual TRR ($) Load (MWH) ($/MWH) ($/MWH) ($) [1] [2] [3] = [1] / [2] [4] = total [1]/ total [2] [5] = [2] x [4] PG&E $ 617,032,124 87,216,119 7.0747 11.7828 $ 1,027,648,059 SCE $ 1,005,965,642 88,026,785 11.4279 11.7828 $ 1,037,199,956 SDG&E $ 509,378,580 20,283,944 25.1124 11.7828 $ 239,001,184 Anaheim $ 30,169,629 2,507,620 12.0312 11.7828 $ 29,546,727 Azusa $ 1,211,542 257,416 4.7066 11.7828 $ 3,033,075 Banning $ 899,991 144,652 6.2218 11.7828 $ 1,704,402 Pasadena $ 15,107,418 1,120,049 13.4882 11.7828 $ 13,197,287 Riverside $ 33,944,568 2,180,985 15.5639 11.7828 $ 25,698,059 Vernon $ 2,877,221 1,154,492 2.4922 11.7828 $ 13,603,121 DATC Path 15 $ 25,450,327 - - 11.7828 $ - Startrans IO $ 3,291,090 - - 11.7828 $ - Trans Bay Cable $ 124,718,938 - - 11.7828 $ - Citizens Sunrise $ 11,344,183 - - 11.7828 $ - Colton $ 1,476,021 372,179 3.9659 11.7828 $ 4,385,302 VEA $ - 544,970-11.7828 $ 6,421,260 GWT $ 18,571,159 CAISO Total $ 2,401,438,433 203,809,211 11.7828 $ 2,401,438,433 SCE Calculation of Forecast TAC Billings HV Utility Specific Rate ($/MWH) 11.4279 TAC Rate ($/MWH) 11.7828 Difference ($/MWH) 0.3548 Gross Load (MWH) 88,026,785 (at ISO Grid Level) Forecast TAC Billings (Difference x Gross Load) 31,231,903 2

March 01, 2018 TAC Rates Based on Filed Annual TRR/TRBA and Load Data TAC Components: Filed HV Annual Utility Filed Gross Specific TAC TAC Annual TRR Load Rate Rate Amount ($) (MWh) ($/MWH) ($/MWH) ($) [1] [2] [3] [4] [5] = [1] / [2] = total [1]/total [2] = ([2]) * [4] PG&E $ 617,032,124 87,216,119 $ 7.0747 $ 11.7828 $ 1,027,648,059 SCE $ 1,005,965,642 88,026,785 $ 11.4279 $ 11.7828 $ 1,037,199,955 SDG&E $ 509,378,580 20,283,944 $ 25.1124 $ 11.7828 $ 239,001,184 Anaheim $ 30,169,629 2,507,620 $ 12.0312 $ 11.7828 $ 29,546,727 Azusa $ 1,211,542 257,416 $ 4.7066 $ 11.7828 $ 3,033,075 Banning $ 899,991 144,652 $ 6.2218 $ 11.7828 $ 1,704,402 Pasadena $ 15,107,418 1,120,049 $ 13.4882 $ 11.7828 $ 13,197,287 Riverside $ 33,944,568 2,180,985 $ 15.5639 $ 11.7828 $ 25,698,059 Vernon $ 2,877,221 1,154,492 $ 2.4922 $ 11.7828 $ 13,603,121 DATC Path 15 $ 25,450,327 - $ - $ 11.7828 $ 0 Startrans IO $ 3,291,090 - $ - $ 11.7828 $ 0 Trans Bay Cable $ 124,718,938 - $ - $ 11.7828 $ 0 Citizens Sunrise $ 11,344,183 - $ - $ 11.7828 $ 0 Colton $ 1,476,021 372,179 $ 3.9659 $ 11.7828 $ 4,385,302 VEA $ - 544,970 $ - $ 11.7828 $ 6,421,260 GWT $ 18,571,159 - $ - $ 11.7828 $ 0 ISO Total $ 2,401,438,432 203,809,211 $ 2,401,438,432 TAC 01Mar18 Rates_03202018 TAC Rates 01Mar18 Page 1 of 4 as of 3/20/2018 8:23 AM 3

PTO 01 Mar 2018 ISO Access Charge Rate HIGH VOLTAGE AND LOW VOLTAGE COMPONENTS Info Only Total HV Total LV Combined Filed TRR Filed TRR TRR Base TRR 793,361,114 986,397,863 1,779,758,977 TRBAA (172,740,539) (38,890,567) (211,631,106) Standby Credit (3,588,451) (4,318,270) (7,906,721) Total 617,032,124 943,189,026 1,560,221,150 PG&E SCE Gross Load 87,216,119 87,216,119 87,216,119 Utility Specific Access Charges ($/MWh) 7.0747 10.8144 17.8891 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# 3/1/2018 ER17-2154 1/1/2018 ER18-54 Base TRR 1,134,951,175 27,959,999 1,162,911,174 TRBAA (120,967,080) (411,633) (121,378,713) Standby Credit (8,018,453) (197,538) (8,215,991) Total 1,005,965,642 27,350,828 1,033,316,470 Gross Load 88,026,785 88,026,785 88,026,785 SDG&E Vernon Anaheim Utility Specific Access Charges ($/MWh) 11.4279 0.3107 11.7387 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# 1/1/2018 ER18-169 1/1/2018 ER18-154 Base TRR 530,419,000 287,285,000 817,704,000 TRBAA (12,661,050) (777,161) (13,438,211) Standby Credit (8,379,370) (4,538,426) (12,917,796) Total 509,378,580 281,969,413 791,347,993 Gross Load 20,283,944 20,283,944 20,283,944 Utility Specific Access Charges ($/MWh) 25.1124 13.9011 39.0135 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# Base TRR 1/1/2018 - ER18-358 1/1/2018 ER18-211 2,915,648 2,915,648 TRBAA (38,427) (38,427) Standby Credit - - Total 2,877,221 2,877,221 Gross Load 1,154,492 1,154,492 Utility Specific Access Charges ($/MWh) 2.4922 2.4922 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# Base TRR 1/1/2018 NJ18-1 1/1/2018 NJ18-1 30,000,000 30,000,000 TRBAA 169,629 169,629 Standby Credit - - Total 30,169,629 30,169,629 Gross Load 2,507,620 2,507,620 Utility Specific Access Charges ($/MWh) 12.0312 12.0312 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# Base TRR 7/1/2011 ER11-3594 1/1/2018 NJ18-8 1,216,936 1,216,936 TRBAA (5,394) (5,394) Standby Credit - - Total 1,211,542 1,211,542 Azusa Gross Load 257,416 257,416 Utility Specific Access Charges ($/MWh) 4.7066 4.7066 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# 1/1/2018 NJ14-4 1/1/2018 NJ18-4 TAC 01Mar18 Rates_03202018 01Mar18 Components 4 as of 3/20/2018 8:23 AM

PTO Pasadena Banning Riverside DATC Path 15 Startrans IO Trans Bay Cable 01 Mar 2018 ISO Access Charge Rate HIGH VOLTAGE AND LOW VOLTAGE COMPONENTS Info Only Total HV Total LV Combined Filed TRR Filed TRR TRR Base TRR 902,619-902,619 TRBAA (2,628) - (2,628) Standby Credit - - - Total 899,991-899,991 Gross Load 144,652 144,652 144,652 Utility Specific Access Charges ($/MWh) 6.2218 0.0000 6.2218 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# 1/1/2018 NJ18-5 1/1/2018 NJ18-5 Base TRR 15,168,702 15,168,702 TRBAA (61,284) (61,284) Standby Credit - - Total 15,107,418 15,107,418 Gross Load 1,120,049 1,120,049 Utility Specific Access Charges ($/MWh) 13.4882 13.4882 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# Base TRR 11/21/2016 ER17-392 01/1/2018 NJ18-3 34,067,870 34,067,870 TRBAA (123,302) (123,302) Standby Credit - - Total 33,944,568 33,944,568 Gross Load 2,180,985 2,180,985 Utility Specific Access Charges ($/MWh) 15.5639 15.5639 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# Base TRR 25,571,090 25,571,090 TRBAA (120,763) (120,763) Standby Credit - - Total 25,450,327 25,450,327 Gross Load - - Utility Specific Access Charges ($/MWh) 0.0000 0.0000 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# Base TRR 3,330,000 3,330,000 TRBAA (38,910) (38,910) Standby Credit - - Total 3,291,090 3,291,090 Gross Load - - Utility Specific Access Charges ($/MWh) 0.0000 0.0000 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# Base TRR 124,393,100 9,506,900 133,900,000 TRBAA 325,838 (209,690) 116,148 Standby Credit - - - Total 124,718,938 9,297,210 134,016,148 Gross Load - 87,216,119 - Utility Specific Access Charges ($/MWh) 0.0000 0.1066 0.0000 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# 1/1/2018 NJ18-6 1/1/2018 NJ18-6 04/20/2017 ER17-998 1/1/2018 ER18-191 1/6/2016 ER16-2192 1/1/2018 ER18-202 4/23/2017 ER16-2632 1/1/2018 ER18-501 TAC 01Mar18 Rates_03202018 01Mar18 Components 5 as of 3/20/2018 8:23 AM

PTO Citizens Sunrise 01 Mar 2018 ISO Access Charge Rate HIGH VOLTAGE AND LOW VOLTAGE COMPONENTS Info Only Total HV Total LV Combined Filed TRR Filed TRR TRR Base TRR 11,302,579-11,302,579 TRBAA 41,604-41,604 Standby Credit - - - Total 11,344,183-11,344,183 Gross Load - - - Utility Specific Access Charges ($/MWh) 0.0000 0.0000 0.0000 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# 6/1/2017 ER17-1698 1/1/2018 ER18-70 Base TRR 1,493,716-1,493,716 TRBAA (17,696) - (17,696) Standby Credit - - - Total 1,476,021-1,476,021 Colton VEA Gross Load 372,179-372,179 Utility Specific Access Charges ($/MWh) 3.9659 0.0000 3.9659 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# 1/1/2018 NJ18-7 1/1/2018 NJ18-7 Base TRR - 3,413,410 3,413,410 TRBAA - - - Standby Credit - - - Total - 3,413,410 3,413,410 Gross Load 544,970 544,970 544,970 Utility Specific Access Charges ($/MWh) 0.0000 6.2635 6.2635 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# Base TRR 9/15/2017 ER17-727 9/15/2017 ER17-727 18,421,764-18,421,764 TRBAA 149,395-149,395 Standby Credit - - - Total 18,571,159-18,571,159 GWT Gross Load - - - Total CAISO Grid Utility Specific Access Charges ($/MWh) 0.0000 0.0000 0.0000 TRR - Eff. Date - Docket# TRBA - Eff. Date - Docket# For Information Only Base TRR 2,727,515,313 1,314,563,172 4,042,078,485 TRBAA (306,090,607) (40,289,051) (346,379,658) Standby Credit (19,986,274) (9,054,234) (29,040,508) Total 2,401,438,432 1,265,219,887 3,666,658,319 Gross Load 203,809,211 Utility Specific Access Charges ($/MWh) 11.7828 9/15/2017 ER17-706 1/1/2018 ER18-558 TAC 01Mar18 Rates_03202018 01Mar18 Components 6 as of 3/20/2018 8:23 AM

2018 Sales Forecast Customer Group Monthly (MWh) Base Forecast Lighting, Small Agricultural Street Line No. Month Domestic & Medium Power Large Power & Pumping Lighting Total 1 June 2,538,162 2,286,247 1,885,585 201,169 63,923 6,975,086 2 July 1,933,080 1,936,601 1,664,532 164,304 59,845 5,758,361 3 August 2,142,392 2,212,873 1,861,375 202,429 62,401 6,481,470 4 September 1,917,402 2,154,514 1,797,444 229,445 59,863 6,158,668 5 October 2,089,885 2,323,417 1,933,975 283,485 59,909 6,690,671 6 November 2,212,629 2,361,847 1,934,509 326,602 58,319 6,893,906 7 December 2,789,843 2,540,407 1,950,815 363,848 57,900 7,702,813 8 January 3,221,732 2,845,020 2,209,485 399,353 59,217 8,734,807 9 February 2,765,792 2,417,700 1,863,127 326,676 57,580 7,430,875 10 March 2,527,066 2,621,626 2,071,013 314,783 61,801 7,596,289 11 April 2,005,294 2,220,217 1,878,111 236,451 61,817 6,401,890 12 May 2,185,629 2,149,076 1,802,083 202,190 63,606 6,402,584 13 14 Total 28,328,905 28,069,545 22,852,055 3,250,736 726,180 83,227,420 NEM Adjustment Lighting, Small Agricultural Street Line No. Month Domestic & Medium Power Large Power & Pumping Lighting Total 1 June -86,125-7,123-3,391-661 - -97,301 2 July -57,549-6,589-3,136-515 (0) -67,790 3 August -46,727-11,426-6,067-1,387 (0) -65,607 4 September -28,757-12,068-6,293-1,565 (0) -48,683 5 October -34,673-11,121-5,996-1,815 (0) -53,605 6 November -51,703-12,589-6,490-2,284 (0) -73,067 7 December -100,436-10,944-5,403-1,910 (0) -118,693 8 January -146,422-11,787-5,459-3,111 (0) -166,778 9 February -122,985-11,192-3,871-3,279 (0) -141,327 10 March -74,827-9,564-3,312-1,974 (0) -89,677 11 April -64,662-8,540-3,790-1,444 (1) -78,437 12 May -77,452-9,568-3,977-1,053 (0) -92,050 13 14 Total -892,317-122,512-57,184-20,998-3 -1,093,014 New NEM Adjusted Sales Forecast Lighting, Small Agricultural Street Line No. Month Domestic & Medium Power Large Power & Pumping Lighting Total 1 June 2,452,037 2,279,124 1,882,194 200,508 63,923 6,877,785 2 July 1,875,531 1,930,011 1,661,396 163,789 59,844 5,690,571 3 August 2,095,665 2,201,447 1,855,309 201,042 62,401 6,415,863 4 September 1,888,645 2,142,446 1,791,151 227,881 59,863 6,109,985 5 October 2,055,212 2,312,296 1,927,979 281,670 59,908 6,637,066 6 November 2,160,926 2,349,257 1,928,019 324,318 58,319 6,820,839 7 December 2,689,407 2,529,463 1,945,412 361,938 57,900 7,584,120 8 January 3,075,310 2,833,233 2,204,027 396,242 59,216 8,568,028 9 February 2,642,807 2,406,508 1,859,257 323,397 57,579 7,289,549 10 March 2,452,239 2,612,062 2,067,701 312,809 61,801 7,506,612 11 April 1,940,632 2,211,677 1,874,321 235,007 61,816 6,323,454 12 May 2,108,177 2,139,508 1,798,106 201,136 63,606 6,310,534 13 14 Total 27,436,588 27,947,032 22,794,871 3,229,738 726,177 82,134,406 8

OPERATION OF TACBA March April May June July August September October November December January February 2017 2017 2017 2017 2017 2017 2017 2017 2017 2017 2018 2018 BEGINNING BALANCE (81,557,075.32) (91,481,688.66) (95,608,931.56) (99,547,723.11) (101,619,139.20) (94,556,819.97) (85,652,826.97) (78,131,983.19) (72,860,986.59) (69,324,247.44) (66,973,713.70) (63,421,900.34) TACBAA Rate Revenues $818,589.62 $679,924.58 795,226.51 $3,768,971.50 $7,957,580.41 $9,124,907.38 $8,149,639.28 $7,301,849.17 $6,433,565.93 $6,515,501.22 $6,712,791.91 $5,400,953.89 Adjustment for FF&U 9,393.32 7,802.13 9,125.22 43,248.95 91,313.24 104,708.31 93,517.11 83,788.72 73,825.17 74,765.38 77,029.29 61,975.95 Net TACBAA Credits 809,196.30 672,122.45 786,101.29 3,725,722.55 7,866,267.17 9,020,199.07 8,056,122.17 7,218,060.45 6,359,740.76 6,440,735.84 6,635,762.62 5,338,977.94 HV Charges (Revenue) from CAISO $60,845,487.82 $74,812,389.48 $73,892,178.31 $79,292,786.82 $94,346,292.76 $113,213,338.85 $115,586,830.84 $94,877,165.28 $84,990,333.48 $75,092,603.39 $77,362,353.45 $76,836,063.10 HV Charges (Payment) from CAISO (70,902,296.91) (79,611,754.82) (78,617,071.15) (84,189,456.41) (95,150,240.71) (113,329,544.92) (115,232,296.23) (96,824,229.13) (87,813,335.09) (78,430,751.95) (80,446,302.71) (76,906,016.09) Net TAC Billing from CAISO (10,056,809.09) (4,799,365.34) (4,724,892.84) (4,896,669.59) (803,947.95) (116,206.07) 354,534.61 (1,947,063.85) (2,823,001.61) (3,338,148.56) (3,083,949.26) (69,952.99) Under(Over) Collection (9,247,612.79) (4,127,242.89) (3,938,791.55) (1,170,947.04) 7,062,319.22 8,903,993.00 8,410,656.78 5,270,996.60 3,536,739.15 3,102,587.28 3,551,813.36 5,269,024.95 ENDING BALANCE (90,804,688.10) (95,608,931.56) (99,547,723.11) (100,718,670.15) (94,556,819.97) (85,652,826.97) (77,242,170.19) (72,860,986.59) (69,324,247.44) (66,221,660.16) (63,421,900.34) (58,152,875.38) AVERAGE BEG/END BAL (86,180,881.71) (93,545,310.11) (97,578,327.34) (100,133,196.63) (98,087,979.58) (90,104,823.47) (81,447,498.58) (75,496,484.89) (71,092,617.01) (67,772,953.80) (65,197,807.02) (60,787,387.86) INTEREST RATE 3.50% 3.71% 3.71% 3.71% 3.96% 3.96% 3.96% 4.21% 4.21% 4.21% 4.25% 4.25% INTEREST (251,360.90) (289,210.92) (301,679.66) (309,578.47) (323,690.33) (297,345.92) (268,776.75) (264,866.83) (249,416.60) (237,770.11) (230,908.90) (215,288.67) ENDING BALANCE (91,056,049.01) (95,898,142.48) (99,849,402.78) (101,028,248.62) (94,880,510.30) (85,950,172.89) (77,510,946.94) (73,125,853.42) (69,573,664.04) (66,459,430.27) (63,652,809.24) (58,368,164.05) Interest in January (230,908.90) Ending Balance (58,599,072.95) 10

A.13-11-003 ALJ/KD1/ar9/jt2/lil Appendix C Southern California Edison Test Year 2015 General Rate Case Net-To-Gross Multiplier Line CPUC No. Description Adopted 1. Revenues 1.00000 2. Uncollectibles Tax Rate 0.00238 3. Uncollectibles Amount Applied 1.00000 4. Uncollectibles Juris. 0.00238 5. Subtotal 0.99762 6. Franchise Fees Tax Rate 0.00910 7. Franchise Fees Amount Applied 1.00000 8. Franchise Fees Juris. 0.00910 9. Subtotal 0.98853 10. Arizona/New Mexico Income Tax Rates 0.00027 11. Other State I.T. Amount Applied 0.98853 12. Other State I.T. Juris. 0.00027 13. Subtotal 0.98826 14. S. I. T. Rate 0.08840 15. S. I. T. Amount Applied 0.98853 16. S. I. T. Juris. 0.08739 17. Subtotal 0.90087 18. Federal Income Tax 0.35000 19. Federal Income Tax Amount Applied 0.98826 20. Federal Income Tax Juris. 0.34589 21. Net Operating Revenues 0.55498 22. Uncollectible and Franchise Fees Factor 1.01161 23. State & Federal CompositeTax Factor 1.67567 24. N-T-G MULTIPLIER 1.8019 11-26 -

DPB 4194 FOR INTERNAL USE ONLY Feb Q1 CORPORATE REVENUE REPORTING INFORMATION SYSTEM PAGE 1 2 FEB* OPERATING REPORT February 2018 KWH SALES (000) CURRENT MONTH QUARTER ENDED Q1 INCREASE/(DECREASE) INCREASE/(DECREASE) FROM FROM 2018 2017 % Plan Variance % 2018 2017 % RESIDENTIAL 1,717,105 (289,455) (14.43) 0 0 0.00 AGRICULTURAL 71,169 19,977 39.02 0 0 0.00 COMMERCIAL 2,860,510 (145,983) (4.86) 0 0 0.00 INDUSTRIAL 501,535 15,475 3.18 0 0 0.00 PUBLIC AUTHORITIES - OTHER 247,185 (3,172) (1.27) 0 0 0.00 PUBLIC ST & HIGHWAY LIGHTING 44,277 4,104 10.22 0 0 0.00 PUBLIC AUTH SPECIAL CONTRACTS 14,897 (802) (5.11) 0 0 0.00 RAILROADS & RAILWAYS 6,120 4,371 * 0 0 0.00 INTERDEPARTMENTAL 138 74 115.63 0 0 0.00 SALES TO ULTIMATE CONSUMERS - BILLED 5,462,936 (395,411) (6.75) 5,671,000 (208,064) (3.67) 0 0 0.00 TOTAL ACCRUAL FOR UNBILLED KWH 320,000 594,000 * 66,000 254,000 * 320,000 7,008,580 * TOTAL SALES TO ULTIMATE CONSUMERS 5,782,936 198,589 3.56 5,737,000 45,936 0.80 320,000 7,008,580 - RESALE SALES 89,703 ### 107,898 * 120,244 ## 25,462 26.86 TOTAL KWH SALES 5,872,639 306,487 5.51 440,244 7,034,042 * YEAR TO DATE TWELVE MONTHS ENDED INCREASE/(DECREASE) INCREASE/(DECREASE) FROM FROM 2018 2017 % Plan Variance % 2018 2017 % RESIDENTIAL 4,113,062 (337,059) (7.57) 29,883,911 308,126 1.04 AGRICULTURAL 154,522 41,666 36.92 1,450,262 (241,096) (14.25) COMMERCIAL 6,302,810 86,424 1.39 42,600,267 287,415 0.68 INDUSTRIAL 1,065,876 72,984 7.35 6,732,134 (291,863) (4.16) PUBLIC AUTHORITIES - OTHER 510,467 (18,300) (3.46) 3,962,750 13,243 0.34 PUBLIC ST & HIGHWAY LIGHTING 84,341 3,445 4.26 541,351 8,829 1.66 PUBLIC AUTH SPECIAL CONTRACTS 31,104 173 0.56 191,919 (3,745) (1.91) RAILROADS & RAILWAYS 13,865 5,207 60.15 91,741 4,778 5.49 INTERDEPARTMENTAL 305 184 150.82 2,558 1,851 * SALES TO ULTIMATE CONSUMERS - BILLED 12,276,352 (145,276) (1.17) 12,518,000 (241,648) (1.93) 85,456,893 87,538 0.10 TOTAL ACCRUAL FOR UNBILLED KWH 320,000 2,036,000 * (330,000) 650,000 196.97 (520,000) 1,315,000 71.66 TOTAL SALES TO ULTIMATE CONSUMERS 12,596,352 1,890,724 15.79 12,188,000 408,352 3.35 84,936,893 1,402,538 1.68 RESALE SALES 120,244 25,462 26.86 1,593,501 (176,201) (9.96) TOTAL KWH SALES 12,716,596 1,916,186 15.88 86,530,394 1,226,337 1.44 # INDICATES LESS THAN 0.1%. * INDICATES OVER 200%. page 1 2018 13

Revenue Change Lighting, Small Agricultural Street Total Domestic & Medium Power Large Power & Pumping Lighting TACBAA PROPOSED ($9,054,074) ($9,222,521) ($7,522,307) ($1,065,814) ($239,638) ($27,104,354) PRESENT ($27,436,588) ($27,947,032) ($22,794,871) ($3,229,738) ($726,177) ($82,134,406) REV CHG $18,382,514 $18,724,512 $15,272,564 $2,163,925 $486,538 $55,030,052 14