On August 4, 2019 Think Geoenergy reported that “(w)ith record electricity generation in May 2019, Costa Rica now derives nearly 100% of its electricity from renewable energies, including geothermal energy, which accounts for around 12.9% of electricity generation.
During the 31 days of the month of May 2019, Costa Rica generated 984.19 GWh of electricity, the highest figure in its history so far and from which, 99.99% came from renewable sources.
As reported by the National Energy Control Center (Cence), the generation figure in the National Electric System (SEN) during the previous month exceeded all historical monthly counts.
Therefore, the Costa Rican Institute of Electricity (ICE) suspended the purchase of energy from the Regional Electricity Market (MER) from the first week of May, and instead, from the 11th day on, it began selling electricity to the Central American nations sustained.
The milestone becomes more relevant because it was reached during the month of May, in full transition between the dry and rainy season; and since it is generally in October that the country reaches the largest electricity generation of the year. The previous record was October 2017 with 976.84 gigawatt hours.
You may read the article on the Think Geoenergy internet site.