“…California is making so much solar energy that large commercial operators are increasingly forced to stop production, raising questions about the state’s costly plan to shift entirely to carbon-free sources of electricity. In the last 12 months, California’s solar farms have curtailed production of more than 3 million megawatt hours of solar energy, either on the orders of the state’s grid operator or because prices had plummeted because of the glut, according to an analysis of data by The Times…”