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Quadrennial Energy Review 2015 -
The 2015 QER didn’t panic. It observed. And in doing so, it reoriented the conversation from How much energy do we have? to When do we have it, and can we move it in time?
For decades, the U.S. electric grid operated on a predictable rhythm. Coal and nuclear ran 24/7. Natural gas and hydro flexed around them. But by 2015, solar had grown 30x since 2010. On spring afternoons in California, renewables were meeting nearly 40% of demand. Then, between 4 PM and 7 PM, a strange thing happened. As solar faded and families came home to cook dinner, grid operators had to ramp conventional power faster than any other time of day—a 13,000 MW climb in three hours. That’s like adding 10 large nuclear plants in the time it takes to watch a movie.
The QER’s first installment, released in April, focused on energy transmission, storage, and distribution. On paper, that sounds technical. In reality, it marked the first time a major U.S. energy policy document implicitly asked: What happens when the sun sets?
