Last August, over half a million California residents simultaneously lost power during the state’s first rolling blackout in 20 years. Critics of renewable energy have pointed to California’s recent gains in wind and solar power penetration to argue that the large-scale outage suggests a correlation between increased variable renewable energy and increased grid vulnerabilities. Meanwhile, in an analysis released in January, CAISO, California’s energy market operator, attributed the large-scale outage to a climate change-induced heat wave, which led electricity demand to exceed existing resource adequacy. In the same report, CAISO proposes “consideration of transmission build out” to overcome transmission constraints across multiple interstate electricity lines as a key to preventing future outages. Whether and how to move electrons across state borders, however, has been at the center of California’s energy transition debate for years.