Tesla Locks In 650 MW of Solar Power With Dual PPAs in Arizona and Texas
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Tesla Energy secured two long-term power purchase agreements on July 28, 2026, locking in approximately 650 megawatts of contracted solar capacity across Arizona and Texas. The back-to-back deals — signed on the same day with separate developers — represent Tesla's largest single-day energy procurement and signal a deliberate shift toward vertically controlling the electricity supply that powers its Supercharger network.
Neither company disclosed financial terms or contract lengths beyond describing them as "long-term." What is clear from project filings and developer statements is the scale: combined, the two projects will eventually deliver over 1.1 terawatt-hours of annual generation earmarked specifically for Tesla's operational infrastructure.
Project Sterling: Tesla's Biggest PPA, Backed by KKR
The larger deal is Project Sterling, a solar-plus-storage complex in Arizona developed by ContourGlobal with KKR as financial backer. Tesla agreed to purchase 90% of the facility's peak output — 458 megawatts — under a long-term offtake arrangement. The project's full specifications:
| Specification | Project Sterling (Arizona) |
|---|---|
| Developer | ContourGlobal (KKR-backed) |
| Solar capacity | 509 MWp / 450 MWac |
| Battery storage | 360 MW / 1.4 GWh (four-hour duration) |
| Tesla's contracted share | 90% of output (458 MW) |
| Annual generation | >1.1 TWh |
| Grid interconnection | WAPA + CAISO (California transmission rights) |
| Commercial operation | Q1 2028 |
ContourGlobal CEO Antonio Cammisecra described it as the company's largest PPA: "Securing our biggest PPA ever … is a testament of our ability to deliver tailor-made solutions to our customer's energy needs." Construction began in 2025 with off-site work completed to meet subsidy requirements under the Inflation Reduction Act. The facility's CAISO transmission rights allow Tesla to "pseudo-tie" the output to California, directing renewable generation to where its Supercharger load is heaviest.
Lumen Farm: 100% Tesla Offtake in Texas
The Texas deal is Lumen Farm, a 140-megawatt solar project developed by Zelestra — an EQT-backed renewable energy platform. Unlike Project Sterling's 90% share, Tesla contracted for 100% of Lumen Farm's output. The project extends an existing relationship: Tesla and Zelestra previously signed a 57 MWac PPA covering a Spanish solar facility in 2024, making Lumen Farm the second chapter of that partnership.
Construction is scheduled to begin in 2027, with full commercial operations targeted for 2029 — giving Tesla a multi-year pipeline of contracted solar generation coming online in two separate waves.
Why Tesla Is Buying Solar Instead of Building It
Tesla sells solar panels and Powerwalls to consumers, but it does not build utility-scale generation for its own grid operations. Instead, it secures power through PPAs — fixed-price contracts that let Tesla lock in predictable electricity costs without owning the infrastructure. As AI data center demand drives electricity prices higher across the Sun Belt, locking in 2026-era PPA rates for 2028–2029 delivery is a hedge against the energy inflation that will otherwise push up Supercharger operating costs.
The Supercharger network served over 60 million charging sessions in Q2 2026 — a record — and Tesla has publicly committed to continued rapid expansion. Renewable-sourced electricity also protects Tesla's sustainability claims to regulators and ESG-focused institutional shareholders.
The Bottom Line for Tesla Owners
These deals don't change what you pay at a Supercharger today. Their effect is longer-term: cheaper, more predictable wholesale electricity flowing into Tesla's network from 2028 onward should help the company hold Supercharger pricing steady even as grid electricity costs rise. For Tesla Energy's business, a 650 MW procurement win on the buyer side demonstrates that the same company selling Megapacks to utilities is simultaneously the biggest corporate buyer of utility-scale storage output — a telling sign of where Tesla's energy strategy is heading.
Photo: Tesla energy infrastructure / Pexels