Rocky Flats Environmental Technology Site Act of 2005 - Instructs the Secretary of Energy to purchase essential mineral rights at the Department of Energy facility, Colorado, known as the Rocky Flats Environmental Technology Site.
Includes among conditions for such purchase that certain federal and state officials designated as trustees enter into a natural resources damage settlement providing that the purchase of essential mineral rights satisfies any existing or potential natural resource damage liability claim arising from releases of certain hazardous substances. Requires the settlement to include a covenant not to sue.