September 01, 2010 TAC Rates Based on Filed Annual TRR/TRBA and Load Data

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1 September 1, 21 s Based on /TRBA and Data Components: Based on the FERC Order on Southern California Edison Company's Revised (Docket No. ER ) only only Total Utility Utility Existing Specific Specific Facilities Facilities ($) ($) (MWh) ($) ($/MWH) ($/MWH) ($/MWH) ($/MWH) [1] [2] [3] [4] [5] [6] [7] [8] [9] = [1] + [2] = [1] / [3] = [21] = [5] / [3] = [19] PGE $ 16,324,74 $ 29,625,978 9,326,715 N $ 369,95,682 $ $ $ $ SCE $ 21,1,759 $ 226,68,32 89,286,28 EC $ 436,7,61 $ $ $ $ SDGE $ 55,142,843 $ 71,47,97 21,226,578 S $ 126,613,75 $ $ $ $ Anaheim $ 23,669,575 $ - 2,766,313 EC $ 23,669,575 $ $ $ $ Azusa $ 1,623,4 $ - 239,575 EC $ 1,623,4 $ $ $ $ Banning $ 1,151,11 $ - 139,457 EC $ 1,151,11 $ $ $ $ Pasadena $ 12,978,57 $ - 1,295,96 EC $ 12,978,57 $ 1.29 $ $ 1.29 $ Riverside $ 2,95,688 $ - 2,21,147 EC $ 2,95,688 $ $ $ $ Vernon $ 1,63,724 $ - 1,288,684 EC $ 1,63,724 $ $ $ $ Atlantic P15 $ - $ 3,565,537 - N $ 3,565,537 $ - $ - $ - $ Startrans $ 5,421,188 $ - - EC $ 5,421,188 $ - $ $ - $ ISO Total $ 492,893,652 $ 537,73,724 28,769,845 $ 1,3,624,376 STEP 1: Calculate the for each. - portion is the percent of Total in each area which has not yet transitioned to the ISO (%) divided by the Total of each area. The ISO portion is the percent of all which has transitioned to ISO-Wide (1%), plus the of Facilities, divided by total load. Existing Facilities (w/) ( w/) ($) ($) ($) (MWH) ($/MWH) ($/MWH) [1] [11] [11B] [12] [13] [13B] = [1] = [1] x % = ([1] w/) x % = [3] = [11] / [12] = [11B] / [12] North $ 16,324,74 $ - $ - 9,326,715 $ - $ - East/C $ 277,426,15 $ - $ - 97,216,552 $ - $ - South $ 55,142,843 $ - $ - 21,226,578 $ - $ - Total $ 492,893,652 $ - - Wheeling ( ( + ISO Wide) + ISO Wide) $ 28,769,845 ($/MWH) ($/MWH) ($/MWH) ($/MWH) [19] [2] [21] [22] ISO Wide ISO Wide ISO Wide ISO Existing ISO Wide Wide ISO-Wide Facilities w/ Facilities w/ only ($) ($) ($) (MWH) ($/MWH) ($/MWH) Existing Facilites () only Facilites (NF) only = [13] + [17] = [19] = [[13B]] + [18] = [15] / [16] North $ $ $ $ East/Central $ $ $ $ South $ $ $ $ [14] [14B] [15] [16] [17] [18] Total ([1]) x 1% Total ([1] w/) x 1% = Total [2] = Total [3] = ([14] + [15]) / [16] =[14B] / [16] ISO-wide $ 492,893,652 $ 487,472,464 $ 537,73,724 28,769,845 $ $ Sep1 s_ xls s 1Sep1 Page 1 of 5 as of 11/19/212 11:51 AM

2 September 1, 21 s Based on /TRBA and Data STEP 2: Calculate the the UDC/MSS pays on and Benefit/Burden. Note: ISO total for may not equal zero due to rounding of. only Amount Paid Based on only Utility Specific Would Have Paid w/ Utility Specific (MWH) ($/MWH) ($) ($/MWH) ($) ($) [23] [24] [25] [26] [27] [28] [29] = [4] = [3] = [7] = [24] x [25] = [6] = [24] x [27] = [26] - [28] PGE N 9,326,715 $ $ 21,91,662 $ $ 16,324,74 $ 5,585,958 SCE EC 89,286,28 $ $ 28,481,272 $ $ 21,1,759 $ (1,52,487) SDGE S 21,226,578 $ $ 49,563,539 $ $ 55,142,843 $ (5,579,34) Anaheim EC 2,766,313 $ $ 6,459,273 $ $ 23,669,575 $ (17,21,32) Azusa EC 239,575 $ $ 559,42 $ $ 1,623,4 $ (1,63,62) Banning EC 139,457 $ $ 325,629 $ $ 1,151,11 $ (825,481) Pasadena EC 1,295,96 $ $ 3,24,17 $ 1.29 $ 12,978,57 $ (9,954,4) Riverside EC 2,21,147 $ $ 5,139,624 $ $ 2,95,688 $ (15,811,64) Vernon EC 1,288,684 $ $ 3,9,46 $ $ 1,63,724 $ 1,378,322 Startrans EC - $ $ $ $ $ ISO Total 28,769,845 $ 487,472,464 $ 487,472,464 $ () STEP 3: For Information Only -- Projected annual net benefits/burdens from for Existing Facilities. $32/32/8 million cap for IOUs; munis are held harmless; IOUs pay muni cost increases in proportion to their cap relative to the total cap. IOU Burden Cap Amount IOUs' Cap Exceeds IOUs' Burden Amount IOU's Burden Exceeds IOU's Cap Payments by Entities with Net Benefit Mitigation Payments Adjusted Net (Benefit) / Burden Reallocation IOU Burden Transition Charge Adjusted Net (Benefit) / Burden Transition Charge ($) ($) ($) ($) ($) ($) ($) ($) ($) ($) ($/MWh) [3] [31] [32] [33] [34] [35] [36] [37] [38] [39] [4] = [29] IF ([31] - [3] >) = [31] - [3]. If no cap, then. IF [3] - [31] > = [3] - [31]. If no cap, then. IOUs = ([32] / total[32]) x total[33]. Munis w/ Benefit= ([3] / total[3]) x total[33] - total[32] = [34] - [33] = [3] + [35] Reallocate IOU Burden [39] so it is proportional to IOU Cap [31] = [39] - [36] = [35] + [37] = [36] + [37] = [38] / [24] PGE $ 5,585,958 $ 32,, $ $ 18,585, $ $ (18,585,958) $ 32,, $ (12,6,227) $ (3,646,186) $ 19,939,773 $ (.3393) SCE $ (1,52,487) $ 32,, $ 33,52,487 $ $ 14,28,394 $ 14,28,394 $ 12,687,97 $ 7,251,866 $ 21,46,26 $ 19,939,773 $.244 SDGE $ (5,579,34) $ 8,, $ 13,579,34 $ $ 5,755,886 $ 5,755,886 $ 176,582 $ 4,88,361 $ 1,564,248 $ 4,984,943 $.4977 Anaheim $ (17,21,32) $ $ $ $ $ $ (17,21,32) $ $ $ (17,21,32) $ Azusa $ (1,63,62) $ $ $ $ $ $ (1,63,62) $ $ $ (1,63,62) $ Banning $ (825,481) $ $ $ $ $ $ (825,481) $ $ $ (825,481) $ Pasadena $ (9,954,4) $ $ $ $ $ $ (9,954,4) $ $ $ (9,954,4) $ Riverside $ (15,811,64) $ $ $ $ $ $ (15,811,64) $ $ $ (15,811,64) $ Vernon $ 1,378,322 $ $ $ 1,378,322 $ $ (1,378,322) $ $ $ (1,378,322) $ $ (1.696) Startrans $ $ $ $ $ $ $ $ $ $ $ Total $ $ 72,, $ 47,99,791 $ 19,964,28 $ 19,964,28 $ $ $ $ $ 1Sep1 s_ xls s 1Sep1 Page 2 of 5 as of 11/19/212 11:51 AM

3 September 1, 21 s Based on /TRBA and Data STEP 4: For Information Only -- Projected annual net benefits/burdens from for Facilities and Total projected annual net benefits/burdens from. Facilities ISO Wide Cost Responsibility NF Total ($) (MWh) ($/MWH) ($) ($) ($) [41] [42] [43] [44] [45] [46] = [2] = [3] = ([15]) / [16] = ([42]) * [43] = ([44]) - [41] = ([45]) + [39] PGE $ 29,625,978 9,326,715 $ $ 232,655,486 $ 23,29,58 $ 42,969,281 SCE $ 226,68,32 89,286,28 $ $ 229,975,627 $ 3,97,325 $ 23,847,98 SDGE $ 71,47,97 21,226,578 $ $ 54,673,524 $ (16,797,383) $ (11,812,44) Anaheim $ - 2,766,313 $ $ 7,125,222 $ 7,125,222 $ (1,85,8) Azusa $ - 239,575 $ $ 617,76 $ 617,76 $ (446,526) Banning $ - 139,457 $ $ 359,21 $ 359,21 $ (466,28) Pasadena $ - 1,295,96 $ $ 3,335,793 $ 3,335,793 $ (6,618,247) Riverside $ - 2,21,147 $ $ 5,669,518 $ 5,669,518 $ (1,141,546) Vernon $ - 1,288,684 $ $ 3,319,277 $ 3,319,277 $ 3,319,277 Atlantic P15 $ 3,565,537 $ $ $ (3,565,537) $ (3,565,537) Total $ 537,73,724 28,769,845 $ 537,73,724 $ $ 1Sep1 s_ xls s 1Sep1 Page 3 of 5 as of 11/19/212 11:51 AM

4 Azusa Anaheim Vernon SDGE SCE PGE PTO 1 September 21 ISO HIGH VOLTAGE AND LOW VOLTAGE COMPONENTS Info Only LV LV Total Total LV Combined Facilities Facilities Base 172,97, ,911,65 226,118, ,88, ,911,65 855,, TRBAA (11,984,623) (18,924,35) (15,629,716) (27,614,339) (18,924,35) (46,538,644) Standby Credit (66,857) (1,814,356) (863,57) (1,523,914) (1,814,356) (3,338,27) Total 16,324,74 435,172,44 29,625, ,95, ,172,44 85,123,86 9,326,715 9,326,715 9,326,715 9,326,715 9,326,715 9,326,715 9,326,715 Charges ($/MWh) /1/21 ER /1/21 ER1-36 3/1/21 ER /1/21 ER1-36 Base 239,391,24 37,931,8 248,667,68 488,58,92 37,931,8 525,99, TRBAA (26,826,427) (291,843) (2,386,574) (47,213,1) (291,843) (47,54,844) Standby Credit (2,563,54) (46,111) (2,212,84) (4,775,858) (46,111) (5,181,969) Total 21,1,759 37,233, ,68,32-436,7,61 37,233, ,33,187 89,286,28 89,286,28 89,286,28 89,286,28 89,286,28 89,286,28 89,286,28 Charges ($/MWh) /1/21 ER & ER /1/21 ER & ER /1/21 ER /1/21 ER1-135 Base 58,838, 56,14, 75,532, 122,26, 134,37, 178,4, 312,77, TRBAA (2,946,688) 43,81 (3,1,263) 62,997 (6,46,951) 16,798 (5,94,153) Standby Credit (748,469) (714,148) (96,83) (1,555,25) (1,79,299) (2,269,398) (3,978,697) Total 55,142,843 55,469,653 71,47,97 12,767, ,613,75 176,237,4 32,851,15 21,226,578 21,226,578 21,226,578 21,226,578 21,226,578 21,226,578 21,226,578 Charges ($/MWh) /1/21 - ER /1/21 - ER /1/21 - ER /1/21 - ER1-467 Base 1,218,96 1,218,96 1,218,96 TRBAA 411, , ,764 Total 1,63,724 1,63,724 1,63,724 1,288,684 1,288,684 1,288,684 Charges ($/MWh) Base 25,3, 25,3, 25,3, TRBAA (1,63,425) (1,63,425) (1,63,425) Total 23,669,575 23,669,575 23,669,575 2,766,313 2,766,313 2,766,313 Charges ($/MWh) /1/29 EL8-64 1/1/21 EL1-1 7/1/25 EL /1/21 EL1-25 Base 1,5, 1,5, 1,5, TRBAA 123,4 123,4 123,4 Total 1,623,4 1,623,4 1,623,4 239, , ,575 Charges ($/MWh) /1/23 EL3-14 1/1/21 EL1-3 1Sep1 s_ xls 1Sep1 Components as of 11/19/212 11:51 AM

5 Total CAISO Grid Startrans Atlantic P15 Riverside Pasadena Banning PTO 1 September 21 ISO HIGH VOLTAGE AND LOW VOLTAGE COMPONENTS Info Only LV LV Total Total LV Combined Facilities Facilities Base 1,15, 53,647 1,15, 53,647 1,158,647 TRBAA 46,11 3, 46,11 3, 49, Total 1,151,11 56,647 1,151,11 56,647 1,27, , , , , ,457 Charges ($/MWh) Base 12,433,792 12,433,792 12,433,792 TRBAA 544, , ,265 Total 12,978,57 12,978,57 12,978,57 1,295,96 1,295,96 1,295,96 Charges ($/MWh) Base 1/1/29 EL9-67 1/1/21 EL ,44,58 21,44,58 21,44,58 TRBAA (453,82) (453,82) (453,82) Total 2,95,688 2,95,688 2,95,688 2,21,147 2,21,147 2,21,147 Charges ($/MWh) Base 7/1/29 EL9-52 1/1/21 EL ,, 31,, 31,, TRBAA - (434,463) (434,463) (434,463) - Total - 3,565,537 3,565,537 3,565, Charges ($/MWh).... Base 5,22, - 5,22, 5,22, TRBAA 21,188-21,188 21,188 - Total 5,421,188-5,421,188 5,421, Charges ($/MWh).... 1/1/23 EL3-21 1/1/21 EL1-28 4/23/28 ER /1/21 ER /27/28 ER /1/21 ER1-139 For Information Only Base 539,381,684 55,35, ,318, ,26, 1,12,7, ,295,792 1,792,995,97 TRBAA (42,515,652) (19,169,347) (39,551,16) 62,997 (82,66,668) (19,16,35) (11,173,18) Standby Credit (3,972,38) (2,934,615) (4,36,691) (1,555,25) (8,9,71) (4,489,865) (12,498,936) Total 492,893, ,931,83 537,73,724 12,767,747 1,3,624, ,699,577 1,679,323,953 28,769,845 2,979,3 2,839,573 2,839,573 28,769,845 2,979,3 28,769,845 Charges ($/MWh) Sep1 s_ xls 1Sep1 Components as of 11/19/212 11:51 AM