Making a single US electrical system boosts renewables, lowers costs

Renewable energy is generally limited by the weather. Wind, solar, and hydroelectric are all sensitive to the local conditions. Given that the US doesn't have a national electric grid, that means they're very intermittent; if the sun's not shining in California, then the golden state doesn't get much photovoltaic power.

Expanding the source of power over much larger regions can overcome the weather dependence; it's essentially unheard of for the entire US to be experiencing low-wind conditions. But this runs up against the structural limits of the US grid, where shifting power over large distances is either impossible or highly inefficient.

A new study released Monday looks into what would happen if that limitation were eliminated. It envisions a massive web of high-voltage, direct-current transmission lines, hooked up to 32 nodes spread across the US. This allows a massive spread of renewable power that could be dispatched anywhere in the nation. The result is a grid with dramatically lower carbon emissions and the bonus of lower costs to consumers.

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