La. Stat. tit. 33 § 4167
Parishes may make contracts covering a period of years with each other relative to the distribution and sale of gas. They may make contracts covering a period of years with owners of gas plants, gas wells, gas fields, gas lands, gas leases, gas holdings, gas pipe line companies, or gas distributing companies for the purchase or use of some or all of their products, or for the leasing or purchase of gas wells, gas fields, gas lands, gas leases, or gas holdings for the purpose of drilling and operating gas wells. They may expropriate, in the manner provided by law, existing gas plants, gas wells, gas distribution systems, or other property, within their respective boundaries, needed for the operation of the gas plants or distributing systems.
La. R.S. § 33:4167