I. How a shared loop actually works
A thermal energy network is less exotic than it sounds. Pipes filled with water, or water mixed with antifreeze, run underground at a mild temperature, roughly the steady 50 degrees Fahrenheit or so that the ground holds a few feet down. Each building ties in with a heat pump, a device that moves heat rather than burning fuel. In winter it pulls warmth out of the loop; in summer it pushes heat back in, and the earth and the neighboring buildings do the balancing.
The appeal upstate is the cold itself. A standard air-source heat pump works hardest on the single-digit January mornings common from Watertown to Plattsburgh, exactly when you lean on it most. A ground loop stays mild no matter the air temperature, so the equipment runs steadier through a North Country winter. The catch is the trench. Digging and laying pipe under a street or a campus is the slow, expensive part, which is why this fits dense clusters better than scattered farmhouses.
II. What the upstate utilities have filed
National Grid, which carries gas across much of upstate, and the Avangrid companies NYSEG and RG&E have each put pilot proposals before the Public Service Commission, the state board that sets utility rules and rates, as the 2022 law required of the large utilities. The chosen sites tend to be clusters where the math is friendlier: a few blocks, a housing complex, a mix of buildings that need heat and cooling at different hours so the loop can trade warmth between them. Exact locations, customer counts, and budgets sit in the filings, and the honest reader should check those rather than trust a round number here.
The strategic question underneath is blunt. These are gas utilities, and the Utility Thermal Energy Network and Jobs Act asks them to practice selling warmth from the ground instead of molecules through a pipe. Whether that pivot pencils out depends on costs no one can quote with confidence yet: drilling, street work, and how many customers on a block actually sign up. At last public report the pilots are small, measured in dozens to a few hundred buildings each, not neighborhoods at scale.
III. The honest math, and who pays
Pilots are paid for through rates, which means other customers help fund them while the lessons are learned. That is the deal the Legislature struck: treat the first networks as research the whole system benefits from, not as a product that must turn a profit on day one. For a ratepayer, the fair question at a rate case is whether a pilot is teaching something transferable, or just drilling an expensive hole in one town.
Costs are the open variable. Networked geothermal front-loads its spending into construction and recovers it slowly over decades of lower operating cost, so a pilot can look costly per building and still be sound as a long bet. It can also simply be too expensive for a given site, and some proposals will not survive review. The Commission's filings are where that argument plays out, and where upstate readers can see the numbers the utilities are willing to stand behind.
IV. Worth watching this month
1. Watch the Public Service Commission's thermal energy networks proceeding for new utility filings and any order approving or rejecting a specific upstate pilot, the one checkable sign that a site is becoming real.
2. Watch National Grid's and the NYSEG and RG&E thermal energy network pages for named pilot locations and any sign-up windows, which matter most if a listed cluster sits near you.
3. Watch NYSERDA's thermal energy networks program for workforce and training notices, routine on their own but a quiet signal that the state still expects the pilots to proceed.
4. Watch NYISO's winter outlooks for how fast electric heating is growing upstate, context for whether the grid can carry many more loops over time.
5. Watch for any rate case where a utility asks to recover pilot costs, the moment the price of these experiments actually lands on your bill.