Lunar Energy raises $232M to scale home battery production

On Wednesday, Lunar Energy announced it has completed two funding rounds totaling $232 million to expand its stationary storage (battery systems used for grid support rather than vehicles) business. The startup, which builds battery packs for homeowners in California, Georgia, and Washington, has now raised more than $500 million in total funding from investors.

The recent funding consists of:

• A previously unannounced $130 million Series C round led by Activate Capital.
• A $102 million Series D round led by B Capital and Prelude Ventures.

The company plans to use the capital to scale its manufacturing operations. Specifically, Lunar Energy plans to scale manufacturing to 20,000 units by the end of this year and plans to reach 100,000 units by the end of 2028. The startup’s hardware is built around 5 kilowatt-hour battery modules, which can be configured to offer capacities between 15 kilowatt-hours and 30 kilowatt-hours. These home batteries are managed by the company’s virtual power plant (VPP) software, which controls distributed energy resources. The software can also control electric vehicle chargers and home appliances, allowing the system to supply electricity back to the grid while tamping down household demand.

This expansion comes as the U.S. electrical grid faces increasing strain from broader electrification and rising data center demand. In this environment, VPPs are expected to replace peaking power plants (power plants that run only when there is high demand) in a matter of years. This potential has drawn significant venture capital and established competitors into the residential energy sector. For instance, competitor Base Power raised $1 billion in October, following a $200 million funding round less than six months prior. Lunar Energy also competes with Tesla, which operates its own Powerwall-based VPP and storage business, and Redwood Materials, an energy storage company founded by former Tesla executive JB Straubel. Other major players, including automaker Ford, are also entering the energy storage space.

Why it matters

As grid demand surges from electrification and data centers, stationary battery storage is becoming a critical infrastructure asset, attracting significant capital despite policy shifts.