Excise exemption for non-conventional power projects requires ministerial certification and long-term purchase or municipal processing agreements. The notification exempts all items of machinery and components required for initial setting up of projects generating power or Bio-CNG from specified non-conventional materials from the whole of excise duty, subject to a Deputy Secretary's certificate confirming necessity for project setup and proof to the Central Excise authority of a valid long-term power purchase agreement; exceptions apply for state-promoted utilities and municipal/urban waste projects where an agreement with the urban local body may substitute the PPA requirement.