Ambrosia Energy Starts 10 GWh Texas Battery Factory for Off-Grid Data Centers
Ambrosia Energy starts a 10 GWh Texas battery factory to supply off-grid data centers, targeting full output in two to three years at $100 per MWh near Austin.
Summary
As of October 14, 2026, Ambrosia Energy had begun building a 10 GWh, 150,000-square-foot battery factory near Austin, Texas. CEO and co-founder Ben Longmier said Tuesday in San Francisco that it could supply about 300 MW of field power plants annually when full production begins in two to three years. Ambrosia, founded by Longmier and Sara Spangelo after they sold satellite startup Swarm to SpaceX, emerged from stealth in June 2026 to provide off-grid data-center electricity for $100 per MWh. It chose solar plus batteries as the cheapest, fastest-to-deploy option, using daytime solar for power and charging, then storage overnight and during cloudy weather.
Ambrosia plans to begin its first commercial plant in West Texas later in 2026, combining 300 MW of solar with 660 MWh of batteries to supply 30 MW continuously at 99.3% uptime. Longmier said overbuilding both resources can remain profitable at $100 per MWh, competing with natural-gas turbines planned by hyperscalers. A 200 kW pilot has operated continuously for more than 100 days. Ambrosia buys existing cells but manufactures simplified packs and solar mounts in-house, reducing costs against outside suppliers. Its pack reportedly has about 100 times fewer parts than competitors and costs 1.3 times the bare-cell price, compared with five to seven times for most stationary-storage systems.
Positives
- 10 GWh of planned factory capacity could supply about 300 MW of field power plants each year.
- 300 MW of solar and 660 MWh of batteries are planned to deliver 30 MW continuously in West Texas.
- More than 100 days of continuous operation have demonstrated the 200 kW pilot’s round-the-clock capability.
- $100 per MWh can remain profitable despite overbuilding solar and storage, according to CEO Ben Longmier.
- 1.3 times the bare-cell cost undercuts the five to seven times typical of most stationary-storage systems.
Risks & concerns
- Two to three years are required before the 150,000-square-foot factory is expected to reach full production.
- 99.3% uptime remains a target for the first commercial plant rather than a demonstrated commercial result.
- 200 kW of proven pilot output is far below the planned commercial plant’s 30 MW continuous capacity.
- Hyperscalers are also planning natural-gas turbines, creating competition for Ambrosia’s off-grid power model.