(a) This subchapter does not authorize a river authority to acquire, install, construct, make additions to, or operate steam generating plants having an aggregate capacity greater than 5,000 megawatts to serve a purchaser in the area served by the river authority on January 1, 1975.
(b) A river authority or a corporation acting on behalf of a river authority under this subchapter may provide retail service only to a retail customer served by the river authority or corporation on September 1, 1995.
(c) Except as provided by this subchapter, this subchapter does not limit a power granted a river authority in its enabling legislation or other applicable law.