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Tesla secures 90% of output from Project Sterling solar farm in Arizona

📍 Electrek October 10, 2026 at 12:05 AM

ContourGlobal has started construction of Project Sterling, a 450 MW AC solar farm with battery storage near Lake Havasu City, Arizona. The groundbreaking ceremony was held on October 6. The project will cover more than 2,000 acres, with over 760,000 solar panels and more than 300 battery containers delivering up to 360 MW, and is expected to come online in 2028. Tesla has a long-term power purchase agreement for about 1 TWh per year, plus the associated renewable energy certificates, equal to 90% of the expected output of more than 1.1 TWh annually.…

Tesla covers about 1 TWh per year, 90% of Sterling's expected output.
Sterling will combine 450 MW of AC solar with up to 360 MW of batteries.

🔎 Why it matters: Tesla's power purchase agreement covers about 1 TWh of the more than 1.1 TWh per year expected from Sterling, with roughly four hours of full-power battery storage.

📈 Upside: According to ContourGlobal, Sterling can deliver clean electricity for up to 16 hours a day through the combination of solar and LFP batteries with liquid cooling.

📉 Risk: The expected 2028 start of operations depends on connecting the project to the Western Area Power Administration grid and meeting that construction schedule.

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Tesla secures 90% of output from Project Sterling solar farm in Arizona

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