25-Year Solar + Storage PPAs: What EDF’s Nevada Deal Signals for C&I Buyers
August 19, 2026
Utility-scale solar + storage deals are becoming a standard procurement tool, not an exception. EDF power solutions North America's recently signed pair of 25-year power purchase agreements with Nevada utility NV Energy, covering a 400MW solar PV and 400MW/1,600MWh battery energy storage project, is a useful marker of where the market is heading. For corporate energy buyers and facilities teams thinking about long-term power strategy, the structure of deals like this one is worth understanding.
The Winston Energy Project at a Glance
The project, called Winston Energy, is currently under construction in Lyon County, Nevada. It pairs 400MW of solar PV capacity with a 400MW/1,600MWh BESS: a one-to-one power ratio between generation and storage that reflects how seriously developers are treating dispatchability as a core requirement, not an add-on.
EDF expects commercial operations to begin in October 2029. That's a roughly three-year construction and commissioning window from the time the PPAs were signed, which is consistent with the lead times now common for utility-scale solar + storage in the US.
Winston Energy will be EDF's fourth project to reach commercial operation in Nevada. The company already operates the Arrow Canyon solar + storage project (200MW solar, 75MW/375MWh BESS), the 234MW Switch standalone solar project that came online in 2017, and has a separate solar + storage project called Bonanza targeted for commercial operation in 2028. That's a meaningful concentration of operating assets in a single state, and it reflects the kind of long-term utility relationships that make repeat deals possible.
Hybrid PPAs Are Moving from Niche to Normal
The structure of the Winston Energy deal, a bundled offtake agreement covering both solar generation and storage output, reflects a shift that's been more visible in Europe but is now picking up in North America.
LevelTen Energy recently launched what it calls a 'hybrid index' specifically to track the average price of renewable + storage offtake deals. The fact that a data provider saw enough market activity to justify building a dedicated tracking product says something. LevelTen's Plácido Ostos noted that Europe has signed more hybrid deals than North America, but that appetite for renewable + storage PPAs in the US is growing.
For C&I buyers, this trend matters for a few reasons. Bundled solar + storage agreements can offer more predictable delivery profiles than solar-only contracts, because the storage component allows the project to shift generation to match demand windows. That changes the risk calculus for procurement teams trying to match contracted supply with actual consumption patterns. It also changes how counterparties, utilities, offtakers, and lenders, assess project value and bankability.
A 25-year contract term is a long commitment. The willingness of a utility like NV Energy to sign two such agreements for a single project reflects confidence in both the developer and the underlying economics of paired solar and storage at scale.
What Long Contract Terms Mean for Energy Strategy
Twenty-five years is not a small number. For corporate buyers evaluating their own energy procurement options, whether through utility green tariffs, direct PPAs, or on-site generation, the duration of deals like Winston Energy is a useful reference point.
Long-term contracts lock in price certainty, which is valuable when power markets are volatile. They also require confidence in the counterparty, the technology, and the regulatory environment over a multi-decade horizon. Utilities signing 25-year agreements are making a statement about where they expect power prices and grid needs to go.
For C&I organizations, the lesson isn't that you need to sign 25-year agreements. It's that your energy strategy needs a comparable time horizon in its planning assumptions. If you're evaluating on-site solar, a BESS, or a third-party PPA today, the right question isn't just what's the payback period. It's what does our energy cost structure look like in 2035, and are we positioned to take advantage of the contracts and incentives available now rather than chasing them later.
Projects like Winston Energy take years from contract signing to commercial operation. The developers who are signing PPAs today started that process long before the ink dried.
The Broader Picture on Developer Momentum
EDF's deal also sits against the backdrop of a reported agreement to sell its North American business to private equity firm KKR, with EDF's North American portfolio reportedly valued at more than €4 billion (approximately US$4.55 billion). That transaction has not yet been completed, according to reporting at the time the Winston Energy PPAs were signed.
Large portfolio transactions like that one tend to accelerate activity in a sector. When major assets change hands or attract significant capital, it often signals that investors see durable value in long-term contracted clean energy: exactly the kind of value that 25-year solar + storage PPAs are designed to create.
For energy and sustainability teams watching the market, developer momentum and capital flows are leading indicators. When experienced IPPs are signing multi-decade agreements and attracting billion-euro valuations, it reinforces that the economics of utility-scale solar + storage are maturing, not speculative.
Start Planning Before the Market Moves
Deals like Winston Energy don't happen quickly. The gap between early-stage project development and commercial operation is measured in years. The same is true for C&I organizations evaluating solar, BESS, or a distributed generation strategy: the organizations that benefit most from favorable contract terms and incentive programs are almost always the ones that started their evaluation early.
If your organization hasn't mapped out its energy procurement options for the next five to ten years, now is a practical time to start. The market is moving, and the projects being contracted today will shape what's available, and at what price, when your current agreements expire.
BioStar Renewables works with C&I organizations to evaluate solar PV, BESS, and distributed generation options and build energy strategies grounded in real project economics. If you'd like to talk through what makes sense for your facilities, we're happy to start that conversation.