Want more wind and solar? We'll need to get rid of outdated grid rules.

As I noted in two previous posts, wind and solar power pose unique challenges to electricity grids, and those challenges put economic constraints on the growth of renewables.

For the most part, wind and solar — also known as variable renewable energy (VRE) — haven't run into those constraints yet, because their penetration remains relatively low. In 2014, wind generated just 4 percent of US electricity; solar produced less than 1 percent. But if wind and solar ever hope to supply...

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