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Northfield Energy Committee urges board to explore thermal energy networks, cites funding opportunities
Summary
The Northfield Energy Committee presented thermal energy networks (ground-source loop systems) to the Select Board, outlining technical basics, potential local heat sources (bakery, wastewater), estimated pipe sizes, glycol safety notes, and possible funding including grants and IRA trenching credits.
Joe (listed on the agenda as 'Joe Wontock' and identifying himself in remarks as 'Joe Wanta') presented on thermal energy networks (TENS), saying the technology could reduce residents’ heating and cooling costs, lower grid peaks and support local housing and development without raising property taxes.
In his presentation Joe described a TENS as “a network that moves heat through the ground in a closed loop in a series of water filled pipes” and said individual buildings connect with ground-source heat pumps. He explained that the pipe fluid is “about 75% water and 25% glycol,” which he called food grade and stated would break down into non-toxic components if released to groundwater. He cited local excess heat sources the committee has identified — notably bakery oven exhaust and the wastewater treatment plant — and urged the board to prioritize opportunities that align with planned municipal trenching and waterline work to lower installation costs.
Joe and other committee members highlighted efficiency and potential funding: they said heat pumps can achieve about 300% efficiency (a claim the committee used to illustrate relative efficiency compared with resistance heating), estimated main-line pipes at roughly 8–10 inches in diameter, and mentioned potential grant funding “up to $1,000,000” as well as possible Inflation Reduction Act trenching credits that could cover a portion of municipal trench work.
Board members asked follow-up questions about timing and next steps. One member asked when wastewater plant upgrades will occur; staff replied that the state permit process is active and that major upgrades were likely 8–12 years out but interim adjustments are expected sooner. The chair recommended the Energy Committee bring its proposal and technical questions to the municipal utility commission for detailed review, and staff encouraged coordination with the economic development director. The meeting record shows the committee will further consult the utility commission and seek specific project-level data and cost estimates.
The presentation was advisory; no formal commitment or vote to proceed was taken at this meeting. Committee members asked the board for guidance and to be part of project planning going forward.
Representative quotes from the presentation include: “We believe we can do all of this without raising taxes,” and “A TENS is a network that moves heat through the ground in a closed loop in a series of water filled pipes.”
