Last updated: November 5, 2026
WattPorch has one job: help U.S. renters and homeowners make good decisions about plug-in solar and backup power. This is how we make sure our content deserves your trust.
Sources first
- Laws: we read the bill text or the state legislature’s official page and note when the law was signed, when it takes effect, and what equipment it covers. Every state page shows a “last checked” date.
- Electricity prices and energy data: we use official sources such as the U.S. Energy Information Administration (EIA) and utility rate sheets.
- Products: we use manufacturers’ published specifications for U.S. models and say when a figure comes from a spec sheet rather than our own measurement.
- Safety: we follow official guidance from bodies such as the U.S. Consumer Product Safety Commission and certification requirements such as UL standards.
Estimates you can check
When we estimate savings or runtime, we show the formula and the assumptions (rate, sun hours, efficiency losses) so you can recalculate with your own numbers. We label estimates clearly and never present them as guarantees.
What we will not do
- Invent experts, credentials, test results or customer reviews.
- Claim to have tested a product we have not tested.
- Let advertisers or affiliate commissions decide our recommendations.
Updates and corrections
Plug-in solar law is changing fast, so we review state pages regularly and whenever we learn of a change. If we get something wrong, we fix it and update the date on the page. Report an error through our Contact page.
Money and independence
WattPorch earns money from ads and affiliate links, explained in our Affiliate Disclosure. Commercial relationships never buy coverage or a place in a list.