Southwestern Power Administration Fund Establishment Act

This bill establishes a single "Southwestern Power Administration Fund" within the U.S. Treasury to consolidate all existing funds managed by the Southwestern Power Administration (SPA), a federal agency that markets power from federally owned dams. It combines SPA's receipts, unexpended balances from three specific legacy funds, and certain appropriations into one account. The fund will cover SPA's core operations: maintaining power transmission lines, marketing electricity, building infrastructure, and administrative costs tied to existing laws like the Flood Control Act of 1944. Any excess funds must be transferred back to the Treasury annually. The bill primarily streamlines how SPA manages its finances without creating new policy.