In recent decades, many countries haveembarked on structural reform programs involving privatesector participation (PSP) across the entire value chain ofthe power sector. Often as part of a broader market orientedreform program, governments have resorted to PSP intransmission and distribution (T and D) for a variety ofreasons, including to: (i) offset years of underinvestmentand poor operating performance under public ownership; (ii)attract considerable private investment to fill thefinancing gap stemming from new T and D additions amidrapidly growing demand for electricity; and (iii) raisefiscal revenues by offloading state assets. In some cases(for example, Brazil and Peru), a prolonged electricitysupply crisis prompted government into structural reforms ofthe T and D sector. The energy sector management assistanceprogram (ESMAP) study covers PSP in transmission, as well asdistribution. The four case-study countries, Brazil, Peru,Philippines, and Turkey were selected based on thesubstantial transmission story under their broaderelectricity PSP experience.