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points by toomuchtodo 15 hours ago | 0 comments

Have you priced residential batteries and time of use to charge at night? That's Base Power's value prop, they partner with ComEd, install batteries at your home and become your power provider charging a lower rate than ComEd. Batteries charge at night when nuclear generators are still humming and demand is low, and then serve daytime load.

Solar may not pencil out, but energy arb over system lifetime might, especially if you have any battery subsidies available. Just keep in mind flexibility to add solar in the future so its as trivial as installing racking and panels and running power to the storage and load center (optimize for optionality).

https://www.chicagotribune.com/2026/07/28/base-power-battery...

[–] very-old-sw 12 hours ago

I get service from San Diego Gas & Electric, have solar and powerwalls, and am part of Community Power's VPP. I am prohibited from charging my powerwall from the grid.

[–] toomuchtodo 11 hours ago

Is this a utility requirement? My understanding is this was due to previous IRS guidance about battery tax subsidies that potentially no longer applies, although I wouldn't be surprised if this is a utility requirement to be on a time of use plan to prevent you from maxing savings by having solar and charging from utility mains at night.

https://diysolarforum.com/threads/new-irs-requirements-for-b...

> The private [IRS] letter ruling was from 2016, prior to the explicit credit for batteries.

From 2023:

> “Batteries and the federal tax credit at a glance: Residential batteries installed in 2023 can qualify for the 30% federal tax credit, even if they aren’t attached to solar panels. The value of the tax credit will vary depending on the equipment installed and labor costs. The battery must be installed at the taxpayer’s residence and be owned by the taxpayer to receive the tax credit.”

(the setting is controlled by Tesla and I have heard some folks, anecdotally, having it removed with a support ticket, ymmv)