35 import-export agencies, wholesale store services, retail store services, purchasing in the nature of distributorship services in relation to the purchase of energy and wholesale distributorships, all of the following for industrial oils and greases, fuels, petroleum, crude petroleum, crude oil, refined petroleum, refined oil, petroleum-based preparations, liquid, solid and gaseous fuels, motor fuel, gas, liquid petroleum gas and electrical energy; import-export agencies in the field of energy; procurement services, namely, procurement of contracts for others for the purchase of energy