Start with the state, utility and project date—not a generic national assumption
The United States is one of the world’s largest solar markets, but household economics differ sharply by state, utility territory, rate design, permitting authority and site conditions. Melnti keeps national equipment research separate from state and city guidance.
Important federal residential-tax change
The IRS states that the Residential Clean Energy Credit was 30% for qualifying property installed from 2022 through December 31, 2025, and that the credit is not available for expenditures made after December 31, 2025. A 2026 residential solar or battery calculation should therefore not assume the former credit unless the project actually satisfies the applicable timing rules.
Source: IRS — Residential Clean Energy Credit.
State and utility economics now matter even more
Without a single federal residential-credit assumption covering new 2026 installations, local electricity prices, export compensation, state incentives, financing, permitting and resilience value can have an even larger effect on payback. Use address-specific rules before treating a national example as a buying recommendation.
Start with California or New York City, then use Melnti’s calculators and verified product library.