Idaho Code § 50-346: MUNICIPALITY PROHIBITIONS ON UTILITY CONNECTIONS.

No municipality, city, incorporated or unincorporated area, special use district, or any other local government entity of any kind may enact or implement any resolution, policy, or ordinance that:

(1) Prohibits, or has the effect of prohibiting, the authorized connection or reconnection of an electric, natural gas, propane, or other energy utility service provided by a public utility, municipality, or cooperative utility;

(2) Restricts, or has the effect of restricting, the source of the electricity, natural gas, propane, or other energy utility service provided by a public utility, municipality, or cooperative utility; or

(3) Requires residents or businesses within the municipality to use a particular type or generation source of electricity, natural gas, propane, or other fuel.