"The US electricity system is at an extremely sensitive and uncertain juncture. More and more indicators point toward a future in which wind and solar power play a large role. But that future is not locked in. It still depends in large part on policies and economics that, while moving in the right direction, aren’t there yet. And so the people who manage US electricity markets and infrastructure, who must make decisions with 20-, 30-, even 50-year consequences, are stuck making high-stakes bets in a haze of uncertainty."