TL;DR
Get backup power and energy gear delivered free with Prime
- Fast, free delivery on millions of items
- Prime Video, Amazon Music and more included
- Member-only deals all year
A new RMI study estimates that adding heat pumps in regions with spare winter grid capacity could spread fixed electricity-system costs across more power use and lower residential rates. The analysis is directional, not a forecast, and lower rates do not guarantee lower household bills; outcomes depend on fuel prices, home efficiency and equipment. The researchers also find that hybrid systems pairing heat pumps with existing fossil-fuel furnaces could fit more installations within current grid capacity.
A new study by RMI estimates that wider heat-pump adoption could lower residential electricity rates in 24 states and Washington, D.C., where the power grid has spare capacity in winter. The analysis challenges concerns that heat pumps would necessarily require costly grid expansion, but its authors stress that the state-level results are directional estimates, not forecasts.
RMI’s researchers examined how much additional electricity use existing grids could accommodate, focusing on places with the most winter capacity available. In much of the United States, electricity demand reaches its peak on hot summer afternoons, when air conditioners are running. The study says many states have more room on their grids in winter, when heat pumps would be used for heating. The study says many states have more room on their grids in winter, when heat pumps would be used for heating.
Heat pumps can provide both heating and cooling. The researchers’ analysis assumes that new heat pumps used for cooling would largely replace less efficient air conditioners, rather than add an equivalent new burden to summer peaks. In states with winter headroom, additional heating demand could use existing grid infrastructure without prompting the costly expansion that would otherwise be needed, according to the study.
RMI estimates that maximizing heat-pump deployment over the coming years without expanding the grid could reduce residential electricity rates by an average of 13% compared with what rates would otherwise be after inflation, a finding that aligns with research on heat-pump operating costs. The report describes that estimate as equivalent to about $200 off a customer’s annual bill. In Michigan, it estimates that installing 3.6 million home heat pumps could lower residential rates by as much as 27%. Those figures concern rates—the price per kilowatt-hour—not a guarantee that every household’s total energy bills would fall.
How Winter Capacity Could Affect Rates
The study matters because grid costs are not limited to the electricity generated and used at any moment. Utilities also recover the costs of infrastructure such as poles, wires, power plants and transformers, along with regulated returns. Those fixed costs are distributed across customers and electricity use. If existing equipment is used more during periods of spare capacity, the cost per unit of electricity could be lower, RMI argues.
That possibility could give policymakers another reason to support heat-pump adoption: in the right grid conditions, it may increase use of existing infrastructure while reducing emissions compared with fossil-fuel heating. The study does not establish that all states have enough capacity, or that adding heat pumps would automatically cut bills. Its results point to where the combination of available capacity and additional electricity use could put downward pressure on rates.
For households considering a switch, the distinction between rates and bills is central. A lower rate can make electric heating more affordable, but total costs also depend on how much energy a home uses and what heating fuel it replaces. That means the potential grid-wide benefit and the financial result for an individual household are related, but not interchangeable.
Products Worth Considering
LG UltraGear 27-Inch QHD OLED Gaming Monitor, 240Hz, 0.03ms, G-SYNC Compatible, FreeSync Premium Pro, HDMI 2.1
DJI Osmo Pocket 3 Creator Combo Vlogging Camera with Mic 2, 1 CMOS, 4K/120fps, 3-Axis Stabilization, 128GB Card
Bose S1 Pro+ Portable PA Speaker
As an affiliate, we earn on qualifying purchases.
Why Heat Pumps May Fit Winter Demand
A common concern about widespread heat-pump use is that the added electricity demand could strain the grid and require expensive upgrades. RMI’s study addresses that concern by comparing seasonal demand with available capacity. The report says summer is the peak-use season in most of the country, while roughly half of states have spare capacity during winter.
Heat pumps’ ability to replace both heating and cooling equipment shapes the analysis. If a heat pump takes the place of an older air conditioner in summer, it may not add much to the highest seasonal demand. In winter, however, its heating use can add electricity consumption at a time when some grids have more room. The study’s conclusions depend on those seasonal patterns and the specific capacity available in each state.
The researchers also examined hybrid systems, in which a heat pump works alongside an existing fossil-fueled furnace or boiler that can provide backup during the coldest hours. RMI argues that keeping backup heating can reduce the grid capacity needed for each home, allowing more households to install heat pumps within existing limits. The report’s example for Illinois found that the grid could accommodate heat pumps as the sole heating appliance in 30% of households, while its modeled optimal mix for using available capacity and lowering rates was 79% hybrid systems and 21% all-electric systems.
“The larger the reduction in electricity rates, the higher likelihood that someone’s energy bill will decrease with a heat pump.”
— Ryan Shea, RMI study co-author
Where the Estimates Fall Short
RMI did not have access to utility-specific data that could refine the state-level results. The study’s estimates are therefore directional rather than forecasts, and actual impacts would depend on local grid conditions, utility costs and the timing and scale of installations.
The analysis also does not estimate how a household’s total energy bill would change after switching to a heat pump. University of Michigan researcher Parth Vaishnav said lower electricity rates do not necessarily produce lower bills, particularly in colder areas where electricity can cost substantially more than fossil gas. A 2024 Michigan study that Vaishnav co-authored found that, under the fuel prices at that time, switching from gas to a heat pump could raise some households’ annual bills by more than $1,000.
Individual results depend on factors including the home’s insulation, heat-pump efficiency, the fuel being replaced and the relative prices of electricity and that fuel. The supplied report does not specify the study’s publication date or provide utility-by-utility estimates, so the timing and local precision of potential savings remain unclear.
What Utilities and Policymakers Can Test
The study suggests that policymakers could use heat-pump incentives as one tool to increase electricity use where winter grid capacity is available. Before treating the estimates as expected savings, however, utilities and regulators would need to examine local system data and assess how new installations would affect seasonal peaks and infrastructure costs.
Hybrid systems are one option raised by the researchers for places where all-electric heating would use too much of the available capacity, especially during the coldest hours. Shea described hybrid heat pumps as “a bridge solution in what makes sense in today’s grid.” Whether that approach is suitable in a particular state or household depends on local conditions and policy choices; the study does not set out a required mix for every region.
The next practical questions are how utilities translate statewide capacity estimates into local planning, whether rate reductions appear as heat-pump use grows, and how those changes compare with household heating costs. The source material does not identify a follow-up study, implementation schedule or announced policy decision.
Key Questions
What did the RMI study find?
It estimates that more heat pumps could use spare winter grid capacity in 24 states and Washington, D.C., and potentially lower residential electricity rates by spreading fixed grid costs over more electricity use.
Does the study show that heat pumps will lower every household’s bills?
No. RMI did not calculate household bill changes. Total costs depend on factors including the home’s insulation, equipment efficiency, the heating fuel being replaced and local energy prices. A lower electricity rate does not guarantee a lower total bill.
How large could the rate reduction be?
RMI estimates an average 13% reduction in residential electricity rates compared with what rates would otherwise be after inflation, equivalent in the report to about $200 off annual bills. It estimates a reduction of as much as 27% in Michigan under a scenario with 3.6 million home heat pumps. The figures are directional estimates, not forecasts.
Why does the study include hybrid heating systems?
A heat pump paired with an existing fossil-fuel furnace or boiler can use the backup during the coldest hours. RMI says this could reduce peak electricity demand and allow more homes to adopt heat pumps within existing grid capacity.
Which states are covered?
The study analyzed 24 states and Washington, D.C., described in the report as the places with the most spare grid capacity. The supplied source names Michigan and Illinois as examples but does not list all the states.
Source: canarymedia.com
