This means it uses part of the energy produced by wind to pump water to a reservoir upstream ... when the entire island spent two hours running on only renewable sources. It was an accomplishment ...

Of course, not every water heater or air conditioner is the same size, which means they all hold variable amounts of liquid. The Milwaukee Transfer Pump, on paper, can handle water movement jobs ...

When the sun is high in the sky, California's abundant solar power will pump water into that upper reservoir ... starts to rely more on energy from wind and solar, which produce electricity ...