“Policy makers would be well advised to consider the data and trade-offs that result from this type of data analysis before adopting policies or mandates for a 100% wind/solar grid.”

—- Nathan Lewis, a chemist at the California Institute of Technology and coauthor of the study Geophysical constraints on the reliability of solar and wind power in the United States, Energy & Environmental Science. The study looked at the the economic and technical viability of recent mandates by dozens of US cities to rely entirely on renewable energy within the next couple of decades. The study found that many barriers exist which would likely make such proposals non-viable and jeopardize the energy flow to their citizens. See also, MIT Technology Review, Relying on renewables alone significantly inflates the cost of overhauling energy.

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