Consumer demand, political demand and improved engineering are moving the world towards a greater use of renewable energy. However, reliability — a critical part of any energy source — remains a limiting factor. How much solar energy can you generate on a cloudy day, or when snow blankets the solar panels? How many wind turbines can you operate when it’s not windy? These sound like simple problems, but they make renewable energy less reliable than fossil fuels. You can’t control the...

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