Municipalities proposing to jointly plan, finance, develop, own and operate a project are hereby authorized, either jointly or separately, to apply to the appropriate agencies of the state, the United States, or any state thereof, and to any other proper agency for such licenses, permits, certificates or approvals as may be necessary, and to construct, maintain and operate projects in accordance with such licenses, permits, certificates or approvals and to obtain, hold and use such licenses, permits, certificates and approvals in the same manner as any other operating unit of any other person; provided, however, nothing herein contained shall be construed to require a municipality to obtain any license, certificate, permit, or approval from the public service commission of Mississippi.