The advantages of solar power and other renewable energy sources are colossal, and arguably necessary for our survival. On solar, the electric grid becomes more efficient and resilient to natural disasters (including hail) and disruptions — not to mention scalable to the 1.3 billion people on our planet living without electricity. On solar, power becomes cleaner, moving us that much closer toward the net zero goal advocated by climate researchers. But the benefits don’t stop there.

Solar costs are falling. In fact, the installed price for residential solar systems is less than half of what it was in 2009...