A heat wave hit the eastern United States last week, sending temperatures skyrocketing from the Ohio Valley to the Eastern Seaboard to the Great Lakes. Called a “heat dome,” a formation of hot, stagnant air sat over much of the country. Philadelphia, Washington, D.C., New York City, and Boston saw heat indices as high as 110 degrees. As people strained to keep cool, spot market prices of electricity hit 10 times their usual, and the electrical grid strained to keep up. As this report from Boston public radio station WBUR – featuring AEE member company EnerNOC – made clear, it was a good time for air conditioning sales, ice cream promotions, and demand response.