Utilities can turn off power to reduce the risk that their equipment could spark wildfires during extreme weather events. Smith Collection/Gado via Getty Images

Colorado is latest state to try turning off the electrical grid to prevent wildfires − a complex, technical operation pioneered in California

Turning off power is a last-ditch strategy for utilities to reduce the risk that their systems could spark wildfires. In most states, deciding whether to take that step is up to utilities.
Is it better to cool your house all day, or adjust the A/C setting on your way out the door? Westend61 via Getty Images

Does turning the air conditioning off when you’re not home actually save energy? Three engineers run the numbers

Energy modeling software provides insight into whether letting your A/C relax while you’re gone all day will save you energy – and money.

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