MONTHLY POWER PRODUCTION SUMMARY FOR: MAY 2006
 
                    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              221190              204               220985             204            220985
ALBENI FALLS DAM ON         5877              182                 5695             182              5695
BIG CLIFF DAM               8290               32                 8258              32              8258
BONNEVILLE DAM & LAK      551211             2368               548843            1776            549435
COUGAR DAM                  4603               77                 4526              77              4526
DETROIT DAM                30700              179                30521             179             30521
DEXTER DAM & LAKE ON        8438               16                 8422              16              8422
GREEN PETER DAM            36678               60                36618              60             36618
HILLS CREEK DAM & LA       20022               46                19976              46             19976
JOHN DAY DAM & LAKE      1092524             1673              1090851            1171           1091353
LOOKOUT POINT DAM &        36742              120                36622             120             36622
MCNARY DAM & LAKE WA      614606             1488               613118             780            613826
THE DALLES DAM & LAK      797159             1233               795926             912            796247
CHIEF JOSEPH DAM & E     1289725             1004              1288721            1004           1288721
ICE HARBOR DAM            372295             2146               370148             429            371866
LITTLE GOOSE DAM & L      483267              697               482570             418            482849
LOWER MONUMENTAL DAM      522409              548               521861             329            522080
LIBBY DAM & LAKE KOO      253308              632               252676             632            252676
LOST CREEK DAM             36735              388                36347             171             36564
LOWER GRANITE DAM &       439800             1357               438444             543            439258
FOSTER DAM                 12043               69                11974              69             11974
GRAND COULEE DAM         2185750             2128              2183622            2128           2183622
HUNGRY HORSE DAM          124056                0               124056               0            124056
 
 
TOTAL                    9147428            16646              9130782           11278           9136150