A heat wave has gripped much of the country this summer. That has people cranking up their ACs to cool down, which is boosting power demand. The rise in power consumption and prices will likely raise the average power bill by about 3% this year compared to last summer. Instead of sweating the heat wave (and rising future power prices), you can cash in on red-hot demand for power. Dominion Energy (D -1.23%), NextEra Energy (NEE -3.95%), and Duke Energy (DUK -0.36%) stand out to a few Fool.com contributors as ...