How a home battery pays

One battery on the wall. Two sides win.

A company puts a big battery on the side of a home. The home gets backup power and a steady bill. The company earns money from the power grid. Here is one day, with real prices.

Show me a home served by

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What power costs through an average day, …

Who gets what

The home

Backup power and a steady bill.

Pays once, for installation: $695
Pays each month, as a member: $19
Gets a battery on the wall: 39.2 kWh
Gets backup when the grid is down: up to 36 hours
Owns or maintains the battery: No

These are Base Power’s published Texas prices and battery figures (basepowercompany.com, read 11 Nov 2026). Prices in other states may differ. The home also buys its power at a fixed rate where Base is the power provider.

The company

Earns from the grid, not from the home.

Where it pays most

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PJM runs the power grid and the wholesale power market for 13 states and Washington DC, from Chicago to New Jersey and Virginia. It is to those states what ERCOT is to Texas. Below is one battery’s yearly value in each of its 20 utility areas. For all 50 states, see the US market map.

Home load the battery covers3 kW

The one assumption that matters most. Drag it to see every zone change.

Buying cheap, using at peak Lower capacity charge Lower transmission charge Not confirmed, not counted

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What to know before trusting these numbers

Policy risk. This is already the rule in Ohio: AEP Ohio, FirstEnergy Ohio and AES Ohio recover transmission from every customer through a nonbypassable rider, so the page counts their transmission tags as 0. PPL Electric has proposed the same in Pennsylvania: transmission (NITS) as a charge every customer pays the utility, whatever their supplier. A supplier could then no longer save its members money by cutting their transmission tags. Base asked the Pennsylvania PUC to let suppliers opt out and take on those costs themselves (dockets P-2026-3065185, P-2026-3065186 and P-2024-3047290). Tick “Model PPL’s nonbypassable transmission proposal” under “Change the other assumptions” to see what the PPL zone is worth without it.

In comments to the Pennsylvania PUC, Base said it saves customers money by dispatching batteries to lower the capacity and transmission tags (PLC and NSPL) on its customers’ bills (Energy Choice Matters, 2 Nov 2026). This page values those two tags, plus energy, for one battery in every PJM zone.

Change the other assumptions

Peak hours actually covered 100%Peaks are set by a few hours a year, known only afterwards. Lower this for missed calls. Capacity pricePJM auction price; every zone cleared at the cap. Tags from summer 2026 peaks are paid in 2027/2028, summer 2027 in 2028/2029. Capacity scaling 1.00xZonal scaling factor times forecast pool requirement. They differ by zone and year; 1.00 leaves them out.

Count these Energy Capacity tag Transmission tag Full 20 kW exports (PJM DER aggregation, from Feb 2028) Also count zones whose capacity and transmission rules are not confirmed Model PPL’s nonbypassable transmission proposal

JSON API Data file

What it takes to launch there

License, billing, filings and consumer rules for each state, with sources. Anything not confirmed is marked.