S. 4175 extends federal tax credits for clean electricity production and investment, with a novel trigger mechanism tied to electricity prices and demand. Under the bill, if the national average electricity price rises more than 2 percent in any year or if total electricity sales increase, the production and investment credits would be extended for six additional years, resetting any phase-out that was underway. The bill also extends the home energy efficiency and residential clean energy tax credits for two years following such price or demand increases. Additionally, the legislation removes restrictions that currently deny clean energy credits for wind and solar leasing arrangements, allowing businesses and homeowners who lease renewable energy equipment rather than buy it to claim the tax benefits. The bill affects renewable energy developers, manufacturers, and homeowners using clean energy, with the extension timeline varying based on when electricity price or demand triggers occur, with all credits scheduled to expire no later than 2032.