Notwithstanding any other provision of this chapter, unless an electric utility, including a municipally-owned electric utility or a municipal electric company, has implemented a restructuring plan that provides for retail competition in its Delaware service territory, such electric utility may not use the transmission or distribution facilities of a nonaffiliated electric utility to make sales to customers in such nonaffiliated electric utility's Delaware service territory; nor shall such electric utility own or receive, directly or indirectly, any economic interest in any entity which uses the transmission or distribution facilities of a nonaffiliated electric utility to make sales to customers in such nonaffiliated electric utility's Delaware service territory.