The Lyceum: Power & Infrastructure Weekly — Mar 28, 2026

Texas hit 33 gigawatts of instantaneous solar generation at session highs — 54% higher than California's all-time solar peak on the session — while simultaneously leading the nation in battery storage additions, and the question is no longer whether renewables can scale but whether the grid can absorb them fast enough. Britain cited the Iran war energy shock as it finalized a building code that bans gas boilers and mandates heat pumps and rooftop solar in every new home from 2028, tripling projected heat pump demand on the government's build-out timeline. And on Capitol Hill, a federal proposal would require data centers to publicly disclose their water and electricity consumption for the first time — the same week Idaho moved to ban evaporative cooling in new facilities and Colorado introduced a first-of-its-kind framework testing grid capacity, water strain, and ratepayer protection in a single statute. Power, cooling, and water are converging in regulatory chambers and rate cases at a speed that outpaces most capital planning cycles.

On March 21, ERCOT hit 33 gigawatts of instantaneous solar generation at session highs — a record 54% higher than California's all-time solar peak on the session. Texas added roughly 11 gigawatts of solar capacity last year, bringing installed capacity to approximately 52 gigawatts. None of this was mandated by a renewable portfolio standard. The market built it because the market pencils out.

The number behind the headline matters more. The EIA's March Short-Term Energy Outlook shows ERCOT entered 2026 with approximately 13.9 gigawatts of commercially operational battery storage — surpassing California for the first time — with another 12.9 gigawatts planned through year-end. Battery costs have fallen to roughly $117 per kilowatt-hour installed, less than a third of 2023 levels since 2023, per EIA data. ERCOT load growth is projected at 21% between 2024 and 2026, amid rising demand from data centers and heavy industry.

If this works — if storage absorbs enough midday solar to prevent chronic curtailment — Texas becomes the proof case that market-driven solar-plus-storage can serve hyperscale loads without mandates. If it doesn't, the signal will be rising curtailment hours in Q2 and collapsing midday power prices that undermine merchant battery economics. Watch ERCOT's real-time curtailment data and ancillary service prices over the next sixty days. That data will tell you whether the grid is absorbing 33 GW or buckling under it.

This is a finalized regulation — SI 2026/335, the Building Regulations (Amendment) (England) Regulations 2026 — not a proposal. From 2028, every new home in England must include a heat pump (or district heating connection) and rooftop solar panels covering an area equivalent to 40% of the ground floor. No new gas connections. Energy Minister Ed Miliband framed the mandate explicitly as a national security response to the Iran war.

The supply chain math is immediate: the UK targets 1.5 million new homes by 2029, and the heat pump market needs to roughly triple from around 100,000 units per year to 300,000, per industry estimates. Developers estimate the changes add approximately £10,000 per home. The Home Builders Federation's CEO called the solar mandate unexpected, claiming "60% of homes can't actually reach that standard."

If manufacturers — Vaillant, Daikin, Mitsubishi Electric, Viessmann — scale production fast enough, this creates the largest captive heat pump market in Europe overnight and hard-wires millions of controllable electric heating loads into the housing stock, a massive resource for demand response and virtual power plant aggregation. If they can't, expect housebuilders to push for implementation delays and judicial review challenges. Watch UK order books from those four OEMs in Q2 for the first real demand signal.

FERC approved the Southwest Power Pool's Consolidated Planning Process, which merges transmission planning and generator interconnection into a single workflow. Instead of developers picking a spot and waiting years for reactive studies, SPP will proactively identify where to build transmission using 10- and 20-year forecasts and provide upfront, standardized connection costs.

FERC commissioners openly called this a "potential national template." The first application window opens next month. If MISO, PJM, or CAISO adopt similar frameworks, it materially shortens the timeline for connecting utility-scale renewables, long-duration storage, and data-center-adjacent firming resources — reducing the incentive for costly on-site gas backup. If they don't, the interconnection queue remains the single biggest bottleneck in the energy transition, and SPP becomes an island of speed in a sea of restudies. Watch for copycat filings from other ISOs by Q3.

Form Energy signed a 12 GWh agreement with Crusoe Energy Systems to supply iron-air batteries — a technology that discharges for 100 hours by reversibly oxidizing iron pellets in a water-based electrolyte. Deliveries are slated from 2027. This follows Form's 30 GWh deal with Google and Xcel Energy earlier this year.

This is the commercial validation threshold for multi-day storage. If iron-air performs at scale — maintaining round-trip efficiency and degradation curves that match lab results — it converts intermittent renewables into dispatchable baseload for AI data centers without grid interconnection or gas backup. Crusoe can co-locate these batteries with wind and solar to create private, firm power islands. If the technology stumbles on manufacturing yield or field reliability, the fallback is exactly the on-site gas capacity (roughly 56 GW in various planning stages nationally, per industry tracking) that the sector is trying to avoid. The observable signal: watch whether Form breaks ground on its manufacturing facility on schedule and whether Crusoe's first battery-firmed campus announces a power purchase agreement with a hyperscaler.

The AC-to-DC transition inside hyperscale data centers crossed from "future possibility" to "commercially available" this month. At Nvidia's GTC conference, Vertiv announced an 800V DC ecosystem for Nvidia's Vera Rubin Ultra Kyber platforms shipping in H2 2026; Eaton showed a medium-voltage solid-state transformer at the heart of its DC distribution system; and Delta released 800V DC in-row power racks rated at 660 kW with 480 kW of embedded battery backup.

The physics case: at near-megawatt rack densities, eliminating AC-to-DC conversion stages cuts copper requirements by 45%, improves efficiency by 5%, and reduces total cost of ownership by 30% for gigawatt-scale facilities, per IEEE Spectrum's reporting. Crucially, this is a cooling story as much as a power story — fewer conversion stages mean less waste heat in the white space, which directly shrinks cooling infrastructure. One unresolved gap flagged at APEC 2026: DC solid-state circuit breakers don't yet exist at the ratings needed for system protection.

If 800V DC becomes the default architecture, it reshapes facility design, UPS topology, and the cooling load calculation for every new build. If the circuit breaker gap isn't closed, adoption stalls at the campus perimeter. Watch which cooling OEMs — Vertiv, Schneider Electric — release DC-optimized thermal product lines in Q2.

A federal proposal filed on March 25 would require data center operators to publicly report electricity and water consumption, including source and projected five-year demand for new facilities. States would collect the data and share it with federal agencies, which would publish regional impact reports. Penalties were proposed for each day of non-compliance.

This is proposed legislation, not law, but it arrives alongside a separate proposal from Sen. Bernie Sanders and Rep. Alexandria Ocasio-Cortez calling for a national moratorium on new AI data center construction — a largely symbolic move that nonetheless provides political cover for state regulators tightening siting rules. Meanwhile, Idaho passed legislation this week effectively banning evaporative cooling in new data centers, and Colorado introduced SB26-102, the first state bill to legislate grid capacity, water strain, and ratepayer protection in a single data center framework.

If the federal transparency proposal picks up Republican co-sponsors from rural data-center-hosting districts — Indiana, Ohio, Georgia — it becomes viable legislation. If it doesn't, the state-level patchwork accelerates, and operators building nationally face a compliance matrix instead of a single standard. The signal to watch: co-sponsorship announcements in the next thirty days.

As AI accelerators like Nvidia's GB200 push single-rack power past 120 kilowatts, air cooling has hit a hard physical wall — water conducts heat roughly 25 times more effectively. The liquid cooling market nearly doubled in 2025 and is forecast to reach $7 billion by 2029. This week, construction firm Gray and fluid specialist Valvoline announced a joint offering to deploy liquid-cooled data centers as a packaged construction-plus-fluids service — a sign that liquid cooling has graduated from niche retrofit to mainstream construction discipline.

Separately, a UCLA study of "adaptive phase cooling" (partner: Ferveret) reported a PUE of 1.03 with zero water consumption via a subcooled-boiling refrigerant loop — a potential step-change over current direct-to-chip methods, though still at lab scale. And Ecolab agreed to acquire CoolIT Systems for roughly $4.5–4.75 billion, explicitly building a combined thermal-and-water platform with a Cooling-as-a-Service model.

If liquid cooling consolidates around integrated service providers like Ecolab-CoolIT and Eaton-Boyd (completed March 12 for $9.5 billion), operators get turnkey thermal management but lose negotiating leverage. If the UCLA phase-cooling approach validates at scale, it could eliminate the water-use tradeoff entirely. Watch for Ecolab's first CaaS contract announcement and Ferveret's first rack-scale deployment.

• Vertiv 800V DC Ecosystem for Nvidia Vera Rubin Ultra Kyber: Commercially available H2 2026, this is the first purpose-built DC power distribution system designed for next-generation AI GPU platforms at near-megawatt rack densities.
• Delta 800V DC In-Row Power Racks (660 kW): Shipping now with 480 kW of embedded battery backup, these racks eliminate multiple AC-DC conversion stages and integrate UPS directly into the power distribution path.
• Microsoft MicroLED Datacenter Networking: Microsoft demonstrated intra-datacenter optical links using micro-LEDs and hollow-core fiber that cut switching power and reduce network heat within racks — a thermal management benefit disguised as a networking innovation.
• LG R290 Therma V Indoor Heat Pump Units: LG expanded its propane-refrigerant (R290) air-to-water heat pump line with new indoor configurations designed for tighter installation spaces — timed precisely for the UK Future Homes Standard demand surge.

Two juries in two days found Meta and YouTube liable for social media addiction — the "design defect" theory is now a litigation playbook for any sector building addictive digital infrastructure. Read → Two Verdicts in Two Days

A state with no renewable mandate hitting 33 gigawatts of solar while its battery fleet races to catch up; a British building code that just turned every new semi-detached into a small power plant with a heat pump; and an iron-air battery deal premised on the idea that rusting and un-rusting pellets can keep an AI data center alive for four straight days.

In Idaho, legislators just banned evaporative cooling to cool servers, which is the kind of sentence that would have gotten you committed in 2015.

See you next week.

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