montana volumes - ' 00 - ' 01 real time volumes traded with mpc for 2000 - 01 : 2000 ( complete year ) purchases - 170 , 198 mwh sales - 6 , 739 transmission - 2 , 725 total - 179 , 662 mwh 2001 ( year - to - date ) purchases - 127 , 112 mwh sales - 856 transmission - 1 , 741 total - 129 , 709