The deregulation of the U.K. natural gasindustry has facilitated new entry and competition in almostall segments of the industry except pipeline transportation.The new regulatory framework, developed largely by theOffice of Gas Regulation (Ofgas), has allowed market forcesto stimulate a variety of specialized services and markettransactions to meet customer needs.But the entire processhas been difficult because of a flaw in the initial industrystructure: the government privatized British Gas as avertically integrated company.The U. K. experience showsthat leaving gas supply integrated with pipelinetransportation and tying up gas in long-term contractsimpede competition.This Note reviews the U.K. reform andthe development of new spot, on-system, and"Flexibility Mechanism" markets.