It's Monday. The quietest way to shave a winter peak turns out to be a hole in the backyard, 200 to 500 feet deep. A national homebuilder just put one under nearly 100 new homes.
In today's edition:
🏡 Big Story: Geothermal goes subdivision-scale
⚡ Quick Hits: Nvidia's battery bar, Snowy 2.0, wildfire tech, Brazil solar, V2G
💰 Capital: CleanSpark's $2.3B Meta campus
📋 Policy Watch: a solar tariff spike, permitting waits, China's data center map
📊 Chart of the Day: how dirty is your state's power?
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The Big Story
Dandelion and Lennar finish nearly 100 geothermal homes near Denver
Dandelion Energy and Lennar have completed nearly 100 homes at Ken Caryl Ranch in suburban Denver, each with its own ground-source heat pump tapping a borehole 200 to 500 feet deep, where the ground holds about 50°F year-round, Inside Climate News reported. The partners plan more than 1,500 homes in Colorado over two years.
"Our mission at Dandelion is to mainstream geothermal, and we think that the time has finally arrived."
A system averages about $25,000 in a new home, and Xcel Energy pays a rebate of roughly the same amount per home, according to the article.
An Xcel spokesperson said builders of large neighborhoods "may receive seven-figure rebate amounts."
A study cited in the article estimates ground-source heat pumps could cut US peak demand by more than 40 GW, saving about $4 billion a year in grid costs.
Just over 1 million US homes use ground-source heat pumps; Dandelion targets 10,000 installations a year.
Source: Inside Climate News
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Quick Hits
Technology milestones from across the grid
Five moves from a quiet weekend.
Nvidia's qualification tests for batteries at AI factories set hard pass/fail bars, including AI-load ramp tracking within 2%, fast demand response within 2 seconds by default, ride-through on weak grids with a short-circuit ratio of 3 or less, and black start from a de-energized bus. NVIDIA
Snowy Hydro began pouring permanent concrete for turbine foundations nearly 1 km underground at Snowy 2.0, with all six reversible turbines delivered and machine and transformer hall excavation more than 90% complete, though a cost reassessment is still pending. RenewEconomy
XPRIZE closed its $11 million wildfire competition, awarding Anduril $1.2 million plus a $1 million bonus for autonomous detection-to-suppression and the SIRIUS Wildfire Alliance $500,000 for fusing radar and optical satellite data. Renewable Energy World
Greener's H1 2026 study found Brazilian distributed solar kits got pricier, with 4 kW equipment up 18.3% to R$1.68/W, while new connections fell 16% year over year to 411,000. pv magazine
CharIN says vehicle-to-charger interoperability remains the key hurdle after its latest Testival; at its May event, 13 of 23 DC systems tested supported bidirectional power flow. electrive
The Capital Stack
CleanSpark closes $2.276 billion to finish a Meta-leased AI campus
Bitcoin miner CleanSpark closed $2.276 billion of 7.875% senior secured notes due 2031 through its subsidiary CSDC Finance I, the company said. Proceeds finance the remaining build-out of its Sandersville, Georgia data center, which its SEC filing describes as 175 MW of critical IT load leased for 20 years to a Meta subsidiary, with rent starting in Q4 2027. The notes are secured by the facility, making it a project-style bond on a single hyperscaler lease.
Source: PR Newswire, StockTitan
Policy Watch
Anza expects median imported module prices to jump more than 40%, from $0.27/W to $0.38/W, for delivery on or after December 4, when a 15% Section 232 tariff on polysilicon and its derivatives takes effect. Like-for-like, the increase is closer to 15%, the company said. pv magazine
Sens. Martin Heinrich and Sheldon Whitehouse signaled that a bipartisan permitting deal should wait until after the November midterms, saying getting it right "has to matter more than election-year deadlines," pushing any permitting fix for transmission past the election. Heatmap
China steers 60% of new data center capacity into eight national computing hubs, where new facilities must source at least 80% of their power from renewables by 2030, Latitude Media reported, while the US has so far identified 16 federal sites for fast builds. Latitude Media
Chart of the Day
How dirty is the power generated in your state?
West Virginia, Kentucky and Wyoming generate the most carbon-intensive power, mostly from coal, while Vermont's in-state generation has been essentially all renewable since 2015, Canary Media's 2024 map shows. US power-sector emissions fell about 40% from 2005 to 2024, and every state except Idaho and Vermont got cleaner over that stretch.
Source: Canary Media, Chart of the Week, data from U.S. Energy Data (Institute for Progress) · September 25, 2026
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