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RMI models heat-pump rate savings, with local grid costs and deployment limits

RMI estimates 13% average residential-rate reduction potential in summer-peaking states under a mixed all-electric and hybrid heat-pump scenario. These are directional estimates, not guaranteed utility bills or a finding that every local wire needs no upgrade.

By Greener Numbers Editorial Team · Published October 25, 2026 · Updated 10/25/2026

An October 15 RMI report estimates that about 86 million additional U.S. homes could install heat pumps within modeled winter grid headroom. The larger opportunity uses a mix of all-electric heat pumps and hybrid systems paired with existing fossil-fuel heating. It is a scenario based on current grid capacity and modeled demand, not a count of installations already completed.

RMI defines winter headroom as available winter generation capacity, after reserves, above winter peak demand. In many summer-peaking states, extra winter electricity sales could spread fixed system costs over more kilowatt-hours. Colder states with less headroom may need hybrid systems that switch to existing heating during the coldest hours.

For the mixed deployment scenario, RMI estimates an average 13% reduction potential in residential electric rates across summer-peaking states, totaling $15.6 billion annually, or about $200 per customer. Its all-electric-only scenario produces a smaller average rate reduction potential of 6%, or $6.7 billion annually. Neither figure is a promised discount on an individual household's next bill.

The model does not establish that all local wires can accept heat pumps without investment. It assumes no extra generation and transmission investment where minimum grid headroom is maintained, but includes additional wholesale electricity costs and estimated distribution upgrades. RMI notes that some local distribution systems are more constrained and will need upgrades.

RMI calls the rate results directional estimates rather than precise forecasts for individual utilities. Deployment would take place over decades as demand, generation, investment and rates change. The report also warns that lower gas consumption could raise gas-system rates unless utilities reconsider spending and cost allocation. Hybrid systems must use appropriate controls and low changeover temperatures to preserve the modeled benefits.

The policy proposals include redirecting equipment incentives toward heat pumps, using rate designs that reflect seasonal system costs, and encouraging upgrades when equipment is replaced. For households, the report supports checking local rates, equipment suitability and installation costs. It does not replace an individual assessment or guarantee that electrification always lowers total heating costs.

Official source: rmi.org ↗