Currently, there is a 30% federal tax credit for solar energy systems. However, this tax credit may change based on the decisions made in Washington and has decreased over time; the sooner you go solar, the less expensive it will be.
Some utility providers also offer rebates to homeowners because it helps reduce the demand on the electrical grid and helps them meet renewable energy they need to meet in order to not get fined. However, just like the tax credit, these rebates will only be around for a limited time.