When President Donald Trump announced the U.S. would withdraw from the Paris climate accord, he said he represented “Pittsburgh, not Paris.”

Pittsburgh Mayor Bill Peduto disagreed. He traveled to Germany this week as part of an unofficial delegation of more than 100 Americans, American officials and business owners who say they are still committed to climate talks taking place in Bonn. One element of Pittsburgh’s climate strategy has been encouraging innovation in a technology known as microgrids.

Usually, power grids rely on a far-flung network. For example, a person making toast might be drawing electricity from miles away. A microgrid is a local, independent power grid that can run without electricity from the main network.

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