he idling schedule of the four units at its Johnsonville plant, with total capacity of 576 MW, "due to operational issues on the remaining units at Johnsonville and to reduce costs." On 7-Feb-12, the Midwest ISO said new clean air rules will force a shift from a primarily coal-driven generation base to one

ly finalized, and other environmental regulations. On 3-Feb-I2, TVA said that it elected to accelerate the idling schedule of the four units at its Johnsonville plant, with total capacity of 576 MW, "due to operational issues on the remaining units at Johnsonville and to reduce costs." On 7-Feb-12, the Midw