A massive 5 GWh thermal energy storage system — among the largest of its kind
KEY DEVELOPMENTS
- POET, Antora Commission 5 GWh Thermal Storage in South Dakota: The massive thermal energy storage system at POET's Big Stone City bioethanol facility represents a landmark deployment of long-duration storage technology at industrial scale. Read More: Renewable Energy World.
- Safe Harbor Elimination Forces Solar Developer Deadline Crunch: The One Big Beautiful Bill Act's removal of the 5% safe harbor, combined with Executive Order 14315 and new IRS notices, means utility-scale solar projects must now satisfy the physical work test — a shift that demands more engineers on-site, not more lawyers in offices. Read More: Solar Power World.
- Enel Acquires Seven Solar Farms for $140 Million: Enel Green Power North America is expanding its U.S. portfolio with the purchase of seven utility-scale photovoltaic facilities across three states, underscoring continued appetite for operating solar assets. Read More: Power Magazine.
- OCI, CPS Break Ground on San Antonio Battery Project: OCI Energy and CPS Energy launched construction on the Alamo City Battery Energy Storage System near San Antonio, adding to Texas's rapidly growing grid-scale storage fleet. Read More: Power Magazine.
- Fixed-Charge Hikes in 27 States Threaten Rooftop Solar Economics: Utility regulators across more than half the country have imposed high fixed monthly charges and minimum bills that are eroding the financial case for distributed solar and battery storage investments. Read More: PV Magazine USA.
Solar & Storage
The utility-scale solar market continues to draw significant capital even as the policy ground shifts beneath developers' feet. Enel Green Power North America's across three states signals that major international players still see robust value in American solar assets. The deal expands Enel's already substantial U.S. renewable energy portfolio and comes just days after Sunraycer closed a $901 million financing package for Texas solar-storage projects, reinforcing a pattern of large-scale capital deployment in the sector despite regulatory headwinds from Washington. Read More: $140 million acquisition of seven PV solar farms.
In California, Terra-Gen completed the third phase of its , a 125-MW utility-scale installation in San Bernardino County designed to help meet the state's surging electricity demand. That project joins a growing roster of California solar milestones: separately, the wrapped up its four-year demonstration phase, with results that exceeded feasibility projections. The 1.6-MW installation — a partnership between Solar Aquagrid, UC Merced, the Department of Water Resources, and the Turlock Irrigation District — proved that shading the state's vast canal infrastructure with solar panels can simultaneously generate clean power and reduce water evaporation. For a state perpetually managing drought risk and grid stress, the dual-use concept could unlock thousands of miles of canal rights-of-way for solar development without consuming additional farmland. Read More: Lockhart III solar project, Project Nexus solar canal pilot.
That land-use tension is playing out in sharp relief in , where residents who once embraced a wind farm are now pushing back against utility-scale solar development. The community's contrasting reactions highlight a dynamic familiar across rural America: the footprint of solar projects on productive agricultural land triggers resistance that towers on ridgelines sometimes do not. The story underscores why innovative siting strategies — landfills, canals, brownfields — matter so much for the industry's social license. Read More: Lowell, Vermont.
Minnesota offered a textbook example of that alternative approach. A consortium of Cedar Creek Energy, Connexus Energy, and Kearsarge Energy on a closed landfill managed by the Minnesota Pollution Control Agency. The installation transforms a site with limited redevelopment potential into a productive clean energy asset — a model that avoids the farmland conflicts flaring in communities like Lowell. Read More: completed the state's first 5-MW solar project.
On the storage front, the commissioning of a at POET's Big Stone City, South Dakota facility marks a significant milestone for long-duration storage. Built by Antora Energy, the system supports POET's bioethanol production and demonstrates that thermal storage can operate at massive scale in industrial applications — a use case that could prove critical for decarbonizing hard-to-electrify sectors. In Texas, on the Alamo City Battery Energy Storage System near San Antonio, adding another major BESS project to ERCOT's pipeline. Meanwhile, Spanish IPP Grenergy , further evidence that Southern utilities are increasingly pairing generation with storage as a default configuration. Read More: 5 GWh thermal energy storage system, OCI Energy and CPS Energy broke ground, signed a long-term solar-plus-storage PPA with Georgia Power.
Wind Energy
The community dynamics of wind development drew attention from two very different vantage points today. In Lowell, Vermont, that the town's wind farm has been broadly accepted by residents — a notable contrast with the opposition now facing solar proposals on nearby farmland. The story illustrates how project type, visual impact, and land-use trade-offs shape local politics in ways that defy simple pro- or anti-renewable categorization. Read More: Canary Media reported.
Internationally, Vattenfall CEO Anna Borg laid out what she called a , emphasizing stakeholder engagement and benefit-sharing models that could hold lessons for U.S. developers navigating increasingly contentious local permitting battles. As onshore wind faces growing resistance in parts of the Midwest and Northeast, the European model of structured community ownership stakes and revenue sharing may become more relevant for American project developers seeking to secure local approvals. Read More: "partnership" approach to wind farm community support.
Policy & Markets
The regulatory landscape for clean energy developers grew more complex this week on multiple fronts. The most consequential shift centers on the through the Trump administration's One Big Beautiful Bill Act, reinforced by Executive Order 14315 and IRS Notices 2025-42 and 2026-15. Under the old regime, developers could lock in tax credit eligibility by spending 5% of a project's cost — a straightforward financial test that lawyers could manage. Now, with only the physical work test available, developers must demonstrate that meaningful construction activity has commenced on-site. The practical implication: projects need boots on the ground, equipment mobilized, and engineering crews active — not just purchase orders and legal filings. The looming deadlines are compressing development timelines and adding execution risk for projects still in early stages. Read More: elimination of the 5% safe harbor provision.
At the state level, a found that utility regulators in 27 states have now implemented elevated fixed monthly charges and minimum bills that are systematically undermining the economics of rooftop solar and behind-the-meter battery storage. By compressing the price spread between peak and off-peak electricity rates, these charges reduce the value of time-of-use arbitrage — the core business case for residential storage. The trend effectively shifts value away from distributed energy resources and toward centralized utility infrastructure, a dynamic that could accelerate the industry's pivot toward utility-scale projects where economics remain more favorable. Read More: PV Magazine analysis.
Separately, for renewable energy projects offered a counterpoint to the prevailing narrative of tightening regulation, though the details and scope of the streamlining effort remain to be seen in implementation. Read More: reports of streamlined approval processes.
LOOKING AHEAD
- Safe Harbor Deadline Pressure Mounts: Watch for an acceleration of construction starts on utility-scale solar projects nationwide as developers race to satisfy physical work test requirements before IRS deadlines close. Project timelines that once stretched comfortably into 2027 are being compressed into the coming months.
- Texas Storage Pipeline Expands: With OCI-CPS breaking ground in San Antonio and Sunraycer's $901M financing closing earlier this week, ERCOT's battery storage buildout is entering a critical construction phase. Expect more BESS groundbreakings across the state through summer.
- Distributed Solar Battleground Widens: The fixed-charge offensive by utilities in 27 states sets the stage for intensifying rate design fights at public utility commissions. Solar and storage advocates are expected to mount formal challenges in several key states in the coming weeks.
TODAY'S QUICK ANSWERS
Q: What does the elimination of the 5% safe harbor mean for utility-scale solar developers still in early-stage development?
A: It fundamentally changes the compliance playbook. Developers can no longer lock in tax credit eligibility with a financial commitment on paper — they must now demonstrate physical construction activity on-site. This shifts risk from the legal and financial teams to the engineering and procurement teams, and it means projects without mobilized equipment and active site work face real jeopardy. Developers should expect compressed timelines and increased demand for construction crews and materials in the months ahead.
Q: Why does the 5 GWh thermal storage deployment in South Dakota matter beyond the biofuels sector?
A: It proves that long-duration thermal storage can operate at industrial scale — 5 GWh is enormous, dwarfing most lithium-ion BESS installations. If the Antora Energy technology performs as commissioned, it opens a pathway for decarbonizing heavy industrial processes that can't easily electrify, from cement to chemicals. For clean energy investors, it signals that the storage market is diversifying well beyond lithium-ion batteries.
Q: Should distributed solar developers be alarmed by the fixed-charge trend spreading across 27 states?
A: Yes, and the trend is accelerating. High fixed charges and minimum bills directly compress the savings that make rooftop solar and home battery storage financially attractive. With more than half of U.S. states now employing these rate structures, the residential solar value proposition is eroding in key markets. Developers should watch pending rate cases closely and consider pivoting marketing strategies toward resilience and backup power benefits rather than pure bill savings.
THE BOTTOM LINE: The Trump administration's tax credit overhaul is forcing solar developers to shift from financial engineering to physical construction as the path to project viability, while a simultaneous squeeze on distributed solar economics at the state level is accelerating the industry's tilt toward utility-scale projects and grid-scale storage.