Costa Rica did an experiment with their electricity agency, ICE, and successfully used 98.55 % of natural resources to generate their power.
Orignal article in Spanish. Use google translate for english.
País cerró el primer semestre del 2015 con un 99% de generación eléctrica renovable
Country ended the first half of 2015 with 99% of renewable electricity generation
In over 147 full days it was generated without using fossil fuels
Alternative renewable sources contributed more than 25% to the parent
During the first half of the year, electricity generation from Costa Rica was conducted almost entirely by renewable energy. This was emphasized by the Instituto Costarricense de Electricidad (ICE)
According to the National Center for Energy Control (Cence) ICE 1 July the National Electricity System (SEN) records that 98.55% of the power generated for consumption by the ICE and other public and private stakeholders comes from renewable sources: water, earth heat (geothermal energy), wind, biomass and solar.
Only 1.45% of the energy matrix in recent months corresponds to fossil fuels, ie diesel burning. During 2014, this percentage was 10.34% and the ICE plans to reduce it to 2.9% at the end of 2015, representing a saving of ¢ 94,000 million.
For the president of ICE, Carlos Obregon, the numbers show that the company has planned an efficient use of renewable resources.
“Having a diverse energy matrix allows more efficiently exploit atmospheric conditions, while the emission of harmful gases is reduced and a positive impact on the stability of rates are favorable,” said the chief.
Last week the Regulatory Authority for Public Services (Aresep) announced a cut in rates by applying the methodology Variable Fuel Surcharge (CVC) . Therefore the ICE stressed that benefit through the use of clean energy sources and lower diesel consumption.
Luis Pacheco, manager of the ICE, emphasized seek stability in the supply of electricity, so he reiterated the entry into operation of the Reventazón Hydroelectric Project . This is already more than 90%.
According to ICE 147 days 100% of generation from renewable sources are were on 31 January, 28 February, 20 March, 11 April, 27 May and 30 June.