MONTHLY POWER PRODUCTION SUMMARY FOR: APR 2011 TOTAL GENERATION TOTAL STATION NET GENERATION POWER AUX NET GENERATION PROJECT IN MWH USE-MWH TO BPA-MWH USE---MWH REPORTED TO FERC DWORSHAK DAM 244907 592 244314 592 244314 ALBENI FALLS DAM ON 10828 162 10666 162 10666 BIG CLIFF DAM 7940 79 7861 79 7861 BONNEVILLE DAM & LAK 500247 3252 496995 2439 497808 COUGAR DAM 9044 98 8946 98 8946 DETROIT DAM 37665 244 37421 244 37421 DEXTER DAM & LAKE ON 1363 11 1352 11 1352 GREEN PETER DAM 48245 65 48180 65 48180 HILLS CREEK DAM & LA 19871 62 19809 62 19809 JOHN DAY DAM & LAKE 1083780 1914 1081866 1340 1082440 LOOKOUT POINT DAM & 55489 154 55335 154 55335 MCNARY DAM & LAKE WA 514089 2880 511209 760 513329 THE DALLES DAM & LAK 720487 720 719767 533 719954 CHIEF JOSEPH DAM & E 1222012 1041 1220971 1041 1220971 ICE HARBOR DAM 202150 1922 200228 384 201766 LITTLE GOOSE DAM & L 370310 555 369755 333 369977 LOWER MONUMENTAL DAM 409420 497 408923 298 409122 LIBBY DAM & LAKE KOO 143853 590 143263 590 143263 LOST CREEK DAM 36143 311 35832 137 36006 LOWER GRANITE DAM & 357296 1308 355988 523 356773 FOSTER DAM 5794 70 5724 70 5724 GRAND COULEE DAM 2041891 2053 2039838 2053 2039838 HUNGRY HORSE DAM 192456 0 192456 0 192456 TOTAL 8235280 18581 8216700 11969 8223311