Hey everybody, welcome to summer, and triple-digit temperatures, and a strained electrical grid.

Today is the first 100-degree test of the state’s electrical grid for 2012. The Electric Reliability Council of Texas, which operates the grid, expects we will have plenty of juice to keep air conditioners humming. Still, ERCOT is asking everyone to conserve this afternoon, during the peak usage hours of 3 p.m. to 7 p.m.

You can see the forecast and actual demand for electricity in the chart above. ERCOT updates this chart throughout the day. Also, there’s something on the chart called HSL, and it does not stand for Happy Summer Lounging. No, HSL means high sustained limit, or the amount of demand that power generators can sustain today.

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