Powerwall and Megapack

In April 2015 Tesla unveiled the Powerwall, a sleek home battery that stores solar energy for use at night or during outages, and the commercial Powerpack — extending the company's mission from cars to the electricity grid itself.

That energy business has since become a major force. Tesla's utility-scale Megapack — each unit storing several megawatt-hours — is deployed in some of the largest grid batteries on Earth, smoothing renewable supply and replacing fossil-fuel "peaker" plants. Tesla deployed a record 46.7 GWh of energy storage in 2025 alone, and built dedicated "Megafactories" to manufacture the systems at scale.

Storage is the missing piece that makes solar and wind reliable around the clock. By building batteries for homes, businesses and the grid — and driving their cost down the same way it did for cars — Tesla is tackling the other half of the clean-energy transition.