AC power plugs and sockets In addition to Germany, it is used in Albania, Austria, Belarus, Bosnia and Herzegovina, Bulgaria, Chile, Croatia, Denmark, Estonia, Finland, Georgia, Greece, Hungary, Iceland, Indonesia, Iran, Italy (standard CEI 23-50), Kazakhstan, Latvia, Lithuania, Luxembourg, Republic of Macedonia, Republic of Moldova, the Netherlands, Norway, Pakistan, Portugal, Romania, Russia, Serbia, Slovenia, South Korea, Spain, Sweden, Turkey, Ukraine, and Uruguay. "Schuko" is an abbreviation for the German word "Schutzkontakt", which means "Protective contact" - in this case "protective" refers to the earth. Some countries, including South Korea, Portugal, Finland, Denmark, Norway and Sweden, require child-proof socket shutters; the German DIN 49440-1:2006-01 standard does
Oil shale in Estonia increasing the use of other energy sources such as renewable energy and natural gas. In 2016, 73% of oil shale mined in Estonia was used for power generation, and about 90% of Estonia's electricity was generated from oil shale. About 15% of produced electricity was exported to Finland and Latvia. Eesti Energia owns the largest oil shale-fuelled power stations (Narva Power Stations) in the world. In addition, a new 300 MW station, which will use circulating fluidised bed boiler technology, is under construction in Auvere. In 2010, 11.4% of the heat supply in Estonia was generated by direct combustion of