The rubber producing Firestone Plantations Company in Harbel, Margibi County, operates a hydropower plant for providing electricity to their operations and around 60, 000 persons. Built in 1942, the dam on the Farmington River was the first power generating dam in the country.

The four turbines have a capacity of 4800kWp, with an annual output of 1.6x103 kilowatts (138 hp) hours. The dam is 150m long. The original material had been imported from the USA. A 3 Megawatt Diesel power plant complements the electricity production.