Could holdouts such as San Francisco ultimately have the last laugh? The spread of both DC generators (such as photovoltaic panels) and DC loads (such as cellphones, flat-panel televisions, LED lights, and even electric cars) is inspiring a small but growing niche for DC microgrids link the two together.
If such building-wide circuits grow into neighborhood grids and, ultimately, meld together to form citywide DC grids, this circuit of electrical history will finally be closed.
That comes from an IEEE Spectrum article, San Francisco’s Secret DC Grid.
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