I am actually trying to do this problem right now, and I think it would just be 1055MW x 67% (since that is the percent of energy lost as heat). I don't think the information about the river is relevant to this problem.
1MW = 1 million watts, watt = J/s
answer is 707MW, or 7.07E8 Joules per second
A power plant has a power output of 1055 MW and operates with an efficiency of 33.0 percent. Excess energy is carried away as heat from the plant to a nearby river that has a flow rate of 1.1 x 10^6 kg/s. How much energy is transferred as heat to the river each second?
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