Governor Taft testified in Washington Wednesday that Congress should replace voluntary standards with rules for the reliability of electricity transmission. Taft told a house committee that the nation’s worst-ever blackout last month proves voluntary standards are inadequate. He says a federal agency or state commissions should take over enforcement. U-S Energy Secretary Spencer Abraham opened the hearings by promising a focused investigation into the cause of the August 14 blackout that hit eight states and Canada. They refused to speculate on causes.