Your Water Heater Can Be Made to Work Like a Battery.

Move over Tesla Powerwall.

Although wind and solar energy are growing in popularity, storing that clean energy costs a lot of money. If consumers wanted to keep their green energy in Tesla’s Powerwall home battery, for example, they would have to shell out $3,500. That may be why Tesla discontinued sales of its largest Powerwall a couple weeks ago.

Instead of expensive battery storage, utilities are turning to a low-cost alternative: For a just few hundred dollars, your electric water heater can be made to work like a battery, a fraction of the cost of a Tesla Powerwall. Here’s how it works.

Read the rest at Popular Science.