This is the single most useful thing to understand about Texas efficiency incentives, and almost nobody explains it. Your transmission and distribution utility runs the program, and it pays the incentive to approved participating service providers — not to you. Oncor states it plainly: incentives are paid to the providers. So there is no rebate form to mail and no check in the post. The money is supposed to show up as a lower price in the bid.
Which gives you a specific question to ask every bidder: are you an approved participating provider for my utility's program, and how much of the incentive is reflected in this price? A contractor who is enrolled but quietly keeps the incentive is not doing anything illegal — they are just not passing it on. Comparing bids without asking this can hide a real difference between two otherwise similar quotes.
Programs here also run on a season. Oncor's residential programs typically operate February through November, and utility program budgets are finite within a year. Booking work in the dead of winter or at the tail of a program year can mean the incentive simply is not available even though the program exists.
The state's own rebate programs are not open. The State Energy Conservation Office says the whole-home efficiency and electrification programs are not yet available and has pushed the expected launch back. Sign up for updates if you want, but do not build a project budget on them.
Texas has no state income tax, so there is no state credit — but there is a property tax angle worth claiming. Tax Code Section 11.27 exempts solar and wind-powered energy devices from property tax. It is not automatic: you file Form 50-123 with your local appraisal district. Install solar and forget this and you will simply pay the tax.