Both federal tracks are still listed by the state as preparing an application — earlier in the process than most states, and with nothing to apply for.
But Nebraska is the state where that matters least, because it has its own long-established instrument: Dollar and Energy Saving Loans. These are low-interest loans for efficiency work, and the rate depends on which utility serves you — the public power districts subsidise them differently, so the same project can carry meaningfully different interest depending on your address.
The mechanic is specific and the order matters enormously. You get a contractor bid, apply through a participating Nebraska bank or credit union, and wait for the state to commit funding before any work begins. Start the work first and you lose the loan. This is the single most common way people disqualify themselves.
Because it runs through ordinary local banks rather than a state portal, the programme is much more accessible than it sounds — your own bank may well be a participating lender.
Nebraska's climate is heating-dominated with genuinely cold winters, and much of the housing stock burns natural gas or propane. With a loan rather than a rebate as the main instrument, the question shifts from "what will they pay for" to "does the monthly saving beat the monthly payment" — which is a much more honest way to evaluate an efficiency project anyway.