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CleanPowerDaily Briefing•

Google backs a hybrid zinc-lithium storage project in West Virginia

9 min read
TODAY'S LEAD: The 380-MWh system paired with 86 MW of solar marks one of the first utility-scale deployments of zinc-based long-duration storage in Appalachia, signaling that data center operators are now bankrolling battery chemistries beyond lithium-ion to firm up round-the-clock power.

KEY DEVELOPMENTS

  • Google Funds 380-MWh Hybrid Storage in West Virginia: MN8 Energy's Mammoth Solar project in Kanawha County pairs 86 MW of solar with 280 MWh of lithium-ion and 100 MWh of zinc-based long-duration storage, backed by a Google offtake agreement tied to regional data center load. PV Magazine USA. Read More: PV Magazine USA.
  • Southwest Intertie's Final 576-Mile Segment Breaks Ground: Construction started on the last leg of the Southwest Intertie Project, a transmission corridor linking Idaho to southern Nevada that will carry renewable power across multiple Western states. Power Magazine. Read More: Power Magazine.
  • PG&E Launches Virtual Power Plant With Google, Tesla: California's largest utility unveiled SHARE, a first-of-its-kind VPP aggregating rooftop solar, home batteries, and other distributed resources from partners including Google, Tesla, Sunrun, and Rewiring America. Power Magazine. Read More: Power Magazine.
  • Texas Adds 657 MW of Solar in Two Project Moves: OCI Energy and Arevia broke ground on a 347-MW PV project in Wharton County, while Sunraycer closed financing on a separate 310-MW/250-MWh solar-plus-storage pair. PV Tech. Read More: PV Tech.
  • Illinois 346-MW Solar Farm Cuts Costs With Robots, Gas-Plant Switchyard: Earthrise Energy's Gibson City Solar Project reached commercial operation by using terrain-following trackers, installation robots, and an adjacent gas facility's existing switchyard to slash interconnection timelines. Solar Power World. Read More: Solar Power World.

Solar & Storage

Google's appetite for clean power has pushed into chemistry territory most corporate buyers still avoid. The Mammoth Solar project in West Virginia's Kanawha County will stack 100 MWh of zinc-based long-duration energy storage alongside 280 MWh of conventional lithium-ion, all paired with 86 MW of solar, according to PV Magazine USA. Developer MN8 Energy designed the project to serve regional data centers, including a planned Google facility in the state. For developers watching the long-duration storage market, this is a bankability signal: a hyperscaler willing to sign a long-term agreement on a non-lithium chemistry at meaningful scale. Read More: PV Magazine USA.

The project also carries political weight. West Virginia's economy remains intertwined with fossil fuel extraction, and a solar-plus-storage installation backed by one of the world's largest tech companies offers a visible counterpoint — along with construction jobs and tax revenue — in coal country. Whether that smooths local permitting for future projects remains to be seen.

Down in Texas, the solar pipeline keeps filling. OCI Energy and Arevia broke ground on a 347-MW project in Wharton County — the same SunRoper Solar development reported in yesterday's briefing — while Sunraycer separately closed financing on a 310-MW/250-MWh solar-plus-storage pair in the state, per PV Tech. Together, the two moves represent 657 MW of new capacity advancing in ERCOT, where cheap land and strong irradiance continue to attract capital even as midday solar curtailment grows. The Sunraycer project's 250-MWh storage component reflects a market increasingly pricing in the reality that standalone solar faces diminishing returns during peak generation hours. Read More: PV Tech.

Tesla, meanwhile, has begun production of its Megapack 3 at a Texas facility, according to Energy Storage News. The product enters a grid-scale battery market that installed 18.9 GW across the U.S. in 2025 — a 52 percent year-over-year jump — and added another 2.38 GW in the first quarter of 2026 alone, per PV Magazine USA. That explosive growth is drawing new entrants and compressing margins, which makes Tesla's manufacturing scale a competitive asset but also intensifies the fight for offtake contracts. Read More: Energy Storage News, PV Magazine USA.

In Illinois, Earthrise Energy's 346-MW Gibson City Solar Project offers a case study in creative interconnection. The project, constructed by Burns & McDonnell, reached commercial operation by connecting through the existing switchyard of an adjacent gas-fired power plant — a move that sidestepped the yearslong queue plaguing most new generation, Solar Power World reported. Terrain-following trackers and installation robots cut engineering effort further. For a sector where interconnection delays kill projects, Gibson City's approach is worth studying: it suggests that brownfield sites near retiring or underutilized thermal plants may offer faster paths to the grid than greenfield development. Read More: Solar Power World.

Out in Washington, Cypress Creek Energy energized its 104-MWdc Ostrea solar project in Yakima County under a power purchase agreement with Microsoft. The $180 million installation includes land stewardship measures conserving 275 acres of ecological habitat, per Solar Builder. It's the second tech-giant-backed solar project to make news today, reinforcing how hyperscaler demand is reshaping clean energy development geography — pulling projects into states like West Virginia and central Washington that weren't traditional solar hotspots five years ago. Read More: Solar Builder.

Not every storage project is moving forward, though. A battery installation in Tewksbury, Massachusetts, was canceled, raising questions about the condition of New England's aging grid infrastructure and the obstacles storage developers face in the region, NENC News reported. Details on the cancellation's cause are thin, but the broader pattern is familiar to Northeast developers: older distribution systems, contested siting, and utility interconnection bottlenecks that can strand otherwise viable projects. Read More: NENC News.

Policy & Markets

Microsoft is challenging Virginia regulations that require data center builders to fund transmission infrastructure upfront, the Financial Times reported. The company had previously pledged to protect ratepayers from bearing the cost of grid upgrades driven by data center load. The tension matters for clean energy developers because data centers are the single largest source of new corporate PPA demand; if transmission cost allocation shifts to ratepayers or is delayed by legal fights, the pace of renewable procurement could slow in Virginia's critical Northern Virginia corridor and elsewhere. Read More: Financial Times.

Treasury Secretary Scott Bessent, meanwhile, attributed high global energy prices in part to Ukraine's attacks on Russian oil infrastructure and U.S. actions involving Iran, per the New York Times. The framing places energy price pressure squarely on geopolitical factors rather than domestic supply decisions — a line that aligns with the Trump administration's broader energy messaging but sidesteps the role that renewable deployment plays in hedging against fossil fuel volatility. For clean energy investors, the comment is a reminder that federal rhetoric continues to center oil and gas as the primary lever for consumer energy costs. Read More: New York Times.

On the grid infrastructure front, work began on the final segment of the Southwest Intertie Project, a 576-mile transmission corridor running from Idaho to southern Nevada, Power Magazine reported. The line will link resource-rich areas in the Pacific Northwest to load centers in the Desert Southwest — exactly the kind of interregional backbone that renewable developers need to move wind and solar power to where it's consumed. Long-haul transmission remains the slowest-moving piece of the energy transition, so every mile that actually gets built is material. Read More: Power Magazine.

In California, PG&E launched a virtual power plant program called SHARE in partnership with Google, Tesla, Sunrun, and Rewiring America, according to Power Magazine. The program aggregates distributed energy resources — rooftop solar, home batteries, and other behind-the-meter assets — to manage electric demand and bolster grid reliability. VPPs have been talked about for years as a demand-side solution, but PG&E's version, described as a first-of-its-kind effort, could prove whether a major investor-owned utility can operationalize the concept at scale. For residential solar and storage installers, it opens a potential new revenue stream; for grid planners, it's a bet that distributed assets can defer some of the capital spending that centralized infrastructure demands. Read More: Power Magazine.

LOOKING AHEAD

  • Long-Duration Storage Watch: The Google-backed zinc storage deployment in West Virginia will be closely tracked by developers evaluating non-lithium chemistries — financing terms and performance data from the 100-MWh system could shape offtake appetite for emerging technologies.
  • Virginia Data Center Cost Fight: Microsoft's challenge to upfront transmission funding requirements could set precedent for how grid upgrade costs are allocated as data center construction surges across the mid-Atlantic.
  • Southwest Intertie Progress: With the final segment of the 576-mile Idaho-to-Nevada transmission line now under construction, developers with solar and wind projects in the Mountain West should monitor permitting and completion timelines for new export capacity.

TODAY'S QUICK ANSWERS

Q: What does Google's zinc storage bet mean for developers exploring alternatives to lithium-ion?

A: It removes one of the biggest barriers — bankability. With a hyperscaler willing to sign a long-term offtake on 100 MWh of zinc-based storage, other corporate buyers and lenders now have a reference transaction. If the Mammoth Solar project performs, expect financing terms for non-lithium chemistries to tighten significantly by 2028.

Q: Why should solar developers pay attention to the Gibson City interconnection strategy in Illinois?

A: Because it worked. Connecting through an adjacent gas plant's existing switchyard let a 346-MW project reach commercial operation without enduring the multi-year interconnection queue that stalls most new generation. Developers scouting sites near retiring or underutilized thermal plants may find similar shortcuts — and that changes how you value land near aging fossil infrastructure.

Q: With 18.9 GW of storage installed in 2025 and Tesla's Megapack 3 now in production, what's the risk for storage investors?

A: Overcapacity in manufacturing and margin compression. The 52 percent year-over-year growth rate pulled in new competitors, and Tesla's scale advantage could squeeze smaller BESS suppliers on price. Investors should watch merchant revenue in ERCOT and CAISO — if storage saturation depresses arbitrage returns, project-level economics get harder to pencil even as hardware costs fall.

THE BOTTOM LINE: Data center demand is now the dominant force shaping where, how, and with what chemistry clean energy gets built in the United States — and the companies writing those PPAs are increasingly willing to bankroll technologies and geographies that the market considered risky just two years ago.