The Latin American country of Costa Rica has achieved an impressive milestone in green energy production by generating 100 per cent of its energy from renewable resources, with a combination of hydropower and geothermal for 75 days in a row.

Thanks to the favorable rainy conditions in the first months of the year, four of Costa Rica's hydropower plants -- Arenal, Cachí, La Angostura and Pirrís -- are generating nearly enough electricity to power the entire country. Using a mix of geothermal, solar, and wind energy sources, the nation of 5 million inhabitants hasn't needed an ounce of coal or petroleum to keep the lights on since December of 2014.

The state-owned power supplier Costa Rican Electricity Institute (ICE) said in a press release that, according to National Electric System figures, it has not been necessary to use hydrocarbons to supply the country's grid at all in 2015, for the months of January, February and so far in March.

"With these (rain) conditions and the reserves accumulated to date, the ICE estimates that the downward trend in rates for all consumers will continue in the second quarter," the power agency was quoted as saying in the Latin American Herald Tribune.