(1) The powers and authority granted and set forth in this article shall be additional and supplemental to any other powers and authority granted by law and shall not amend, repeal or supersede any other powers and authority granted by law.
(2) Nothing in this article shall authorize an alliance to provide utility services, other than water and sewage, for compensation. This subsection shall not be construed to prevent a city, county or natural gas district from supplying utility service that it is authorized to supply in the service area that it is authorized to serve.
(3) Nothing in this article shall be construed to limit the authority of any local government unit to plan, construct, expand or maintain a project as defined in this article utilizing any method not included in this article, nor shall the authority to issue bonds to finance such projects or oversight of the project be construed to be transferred to the MDA.