The battery backup Elon Musk built has saved South Australia tens of millions of dollars.

Musk’s Australian solar and wind farm powers rural South Australia, with a population density between Wyoming and Alaska.

South Australia experienced a near total blackout in 2016, after 80,000 lightning strikes and at least two tornadoes.

The push for renewable energy was blamed for the extent of the blackouts. As the head of batteries at Tesla, Musk said he was sure the company could do better, and he jumped in to promise his team would.

Read more: Elon Musk’s Battery Farm Is an Undeniable Success ( | Popular Mechanics)