Losses are not 50% as has been stated on national TV and in blogger forums. The losses below modeling the full transmission systems at the time of system peak, which is the period of highest losses, is less than 5% in both Texas and the Western US system of companies and part of Canada. 2010 SUMMER ON-PEAK BASE CASE - ERCOT SSWG UPDATED 12/11/2009 Texas AREA SUMMARY REPORT: GENERATION ---LOAD--- ---LOSS--- INTERCHANGE DIFF SLACK A# AREA MW MVAR MW MVAR MW MVAR MW MVAR MW dMW -- -------- ------ ------ ------ ------ ------ ------ ----- ----- ---- ----- 1 28508 5293 26065 7809 841.3 -3011 1602 495 0.00 2 0 0 783 257 0.8 -5 -784 -251 0.00 4 16970 4025 20057 4332 258.7 -1014 -3346 708 0.01 0.05 5 4719 944 5043 1693 52.1 -375 -376 -373 0.01 6 1018 -47 1283 231 68.7 -356 -334 76 0.00 7 6036 1180 3613 1202 99.3 -233 2324 211 0.00 8 6517 1507 5387 1133 143.5 281 986 92 0.00 9 1361 262 2443 645 56.9 -96 -1139 -287 0.00 10 2661 265 0 0 5.1 206 2656 58 0.00 11 2262 852 3354 916 52.2 345 -1144 -409 0.00 12 463 36 70 9 7.7 121 386 -94 0.00 13 803 150 1008 173 40.4 -26 -246 4 0.00 15 113 67 283 57 0.3 9 -170 0 0.00 16 400 199 0 0 1.5 130 399 68 0.00 17 2317 549 2118 616 30.2 221 169 -289 0.00 18 0 193 26 8 0.2 15 -27 169 0.00 19 0 0 339 15 2.4 13 -342 -29 0.00 20 287 175 497 70 6.0 73 -216 30 0.00 21 67 20 96 24 0.5 10 -30 -14 0.00 22 231 47 321 76 3.6 38 -94 -67 0.00 23 0 0 198 10 0.2 0 -199 -11 0.00 TOTALS 74798 15545 73126 19305 1672.0 -3760 2.2% transmission loss at peak WESTERN ELECTRICITY COORDINATING COUNCIL 2010 HS3 OPERATING CASE Western US AREA SUMMARY REPORT: GENERATION ---LOAD--- ---LOSS--- INTERCHANGE DIFF SLACK A# AREA MW MVAR MW MVAR MW MVAR MW MVAR MW dMW -- -------- ------ ------ ------ ------ ------ ------ ----- ----- ---- ----- 10 2964 576 2626 581 216.5 -194 122 189 -0.01 11 917 76 1622 329 50.7 -380 -756 127 -0.01 14 26480 4458 19416 3199 535.0 2343 6529 -1084 -0.06 18 5862 2501 6313 1194 99.3 1170 -551 136 0.01 20 2090 369 2224 503 32.6 -76 -167 -58 0.00 21 1139 29 964 112 32.6 -21 142 -61 0.00 22 3530 1912 4868 642 105.7 792 -1444 477 0.01 24 17848 3212 24498 -2143 1606.2 5390 -8256 -34 0.00 26 7595 838 6880 1120 184.9 -1062 530 780 0.01 30 27947 6175 26785 5012 1812.7 1601 -651 -438 0.01 0.00 40 30879 7091 28324 7607 1054.7 -1162 1501 647 0.02 50 10858 334 7778 2354 660.2 -1922 2420 -97 0.01 52 1107 245 733 207 108.5 161 265 -123 0.00 54 10080 2264 9902 3264 571.5 -887 -393 -112 0.00 60 4122 419 3449 795 203.0 -221 470 -155 0.00 62 3113 506 1875 774 93.1 -63 1145 -204 0.01 63 197 -78 98 33 7.3 -98 92 -13 0.00 64 1888 -73 1989 447 48.3 -580 -150 59 0.00 65 7727 2133 8726 2430 285.3 -396 -1285 98 -0.01 70 7238 3255 7725 2456 191.0 647 -678 151 -0.01 73 6357 1204 5028 1612 215.1 -123 1114 -284 0.01 TOTALS 179938 37453 171823 32539 8114.1 4914 4.5% transmission loss