> Therefore, they believe, we should deemphasize solar in favor of “firm” sources of energy like gas turbines, next-generation nuclear or advanced geothermal.
One cool thing about advanced geothermal is that it can load follow solar like natural gas does today: ramp down when solar is abundant and ramp up when it is not. That could come from slowing the turbines, or even by storing the extracted heat (in molten salt) during peak solar hours and using it to turn the turbines to meet peak demand or overnight.
They are in many ways a great complement for each other.