In carrying out the demonstration program required by this section, the Secretary is authorized to delegate responsibilities to, or to contract with, other Federal agencies or with such State or local instrumentalities or other public or private bodies as the Secretary may deem desirable. Such demonstration program shall be coordinated, to the extent practicable, with the State energy conservation plans as described in, and implemented pursuant to, part C of title III of the Energy Policy and Conservation Act [
42 U.S.C.
6321 et seq.].