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Committee discusses network geothermal pilots and high retrofit costs
Summary
Members and guests reviewed network geothermal examples and pilot costs, citing a Framingham pilot of about $17 million for 35 customers and debating whether new construction or retrofits are most cost‑effective for Concord.
Committee members and invited guests discussed network geothermal systems on Oct. 28, reviewing costs and technical approaches and noting that new construction typically offers better economics than retrofits.
Participants referenced a recent webinar and a Framingham pilot project described as costing roughly $17 million to serve 35 customers—an average in the discussion of “a little over $100,000 per home.” Speakers cautioned that pilot projects vary widely: some attendees cited retrofit figures in the tens of thousands per home while others noted multi‑million‑dollar regional projects used in other states.
Speakers emphasized that economies of scale, building type and whether projects serve new construction or retrofit existing homes drive costs. Attendees recommended focusing on pilot opportunities tied to redevelopment or large new‑build sites where network geothermal and district‑scale models are more financially viable. Committee members agreed to share resources and follow up with experts on feasibility and funding pathways.
Next steps: staff and interested members will compile examples and cost breakdowns and consider whether to target future grant applications or pilot studies to new construction or redevelopment sites.
