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What’s happening in Hawaii is actually indicative of what’s going to be an issue everywhere as many cities start to see an increase in large-scale solar implementation: There’s going to be too much energy generated, and nowhere to put it.

The absolute best idea is for homeowners to start installing batteries that can store the power for later use instead of giving the power back to the utilities, something called peak load shaving.

Right now, Tesla’s batteries are about about $300 per kWh, which is comparable to the market rate the industry expected for 2020.

The largest size (2500 watt) could provide enough power for a small house (though would obviously need backing up). The 1000 is good for RVs and boat owners, the Agustssons say, while the smallest 50 watt one is right for USB devices and laptops. The turbines can also back up electric cars when the grid isn't available.