In the early twentieth century, Jamaica had several small regional electricity companies. JPS was founded in this competitive market on the 25 May 1923, with just 3,928 customers. It assumed the licences and stock of both the West India Electric Company and the Jamaica Electric Light and Power Company, who operated
Bog Walk hydro station and Gold Street power station, as well as Kingston's
tram system. The capital in JPS, at its foundation, was "primarily Canadian". The first general manager was Alfred S. Nichols, an employee of
Stone & Webster. Nichols remained as general manager for 15 years, until his death in 1938. Over the next few decades, JPS acquired or merged with rival electricity providers, emerging as the island's dominant power company by 1945. In 1966, its dominant position was recognised by the Government in the form of the first "All-Island Electric Licence", which granted it a formal monopoly. Shortly afterwards, in 1970, JPS was nationalised by the Government of
Hugh Shearer. This new status quo persisted for 31 years until the Government of
P. J. Patterson privatised the firm in 2001, as part of a programme of national economic and fiscal reforms. The Jamaican Government sold an 80% stake to the American
Mirant Corporation, for US$201 million. Mirant sold its 80% stake to the Japanese firm Marubeni in 2007, along with the rest of its Caribbean holdings, for about US$732 million. Marubeni in turn sold half of its stake in 2009 to the Emirati firm
TAQA. After two years TAQA exercised an exit clause to divest, with the Korean firm KEPCO ultimately taking on its 40% share, for US$285 million. As of 2025 JPS is owned 40% by Marubeni, 40% by KEPCO and 19.9% by the Government of Jamaica, with the remainder held by approximately 3,000 private shareholders. == Regulation and licence ==