The nationâs first utility-owned networked geothermal system went live on June 4 in Framingham, Massachusetts. The $15 million project, led by Eversource Energy, uses ground-source heat pumps to cool and heat 36 buildings without fossil fuels.
Networked geothermal systems use consistent underground temperatures of around 55 degrees Fahrenheit to heat and cool buildings. Buried pipes transfer heat into homes during winter and out in summer, or between buildings with varying heat needs. For instance, a data center can transfer excess heat to nearby homes, explained Ania Camargo, senior manager at the Building Decarbonization Coalition. This system is highly efficient and helps transition away from fossil fuels, providing a path for gas companies and workers.
The DOE supported 11 community geothermal projects with $13 million.
Eversourceâs pilot in Framingham charges customers a monthly fee ($10 residential, $7 income-qualified, $21 commercial) plus electricity costs, with expected savings.
Initial projects are costly, but utilities spread costs over customers, and the Inflation Reduction Act can assist with retrofits.
Some college campuses and single-entity developments already use networked geothermal systems. Legislation in six states allows or mandates utility pilots, with six more filing similar legislation. Nine pilots are in progress in New York, four in Massachusetts (one under construction), and proposals exist in Minnesota.
Cities can use geothermal for municipal buildings, encourage utilities, and advocate for state legislation. âUtility companies are more excited to work with informed towns,â said Camargo.
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