Energy production in Greece is dominated by the state owned Public Power Corporation (known mostly by its acronym ΔΕΗ, or in English DEI). In 2009 DEI supplied for 85.6% of all electric energy demand in Greece, while the number fell to 77.3% in 2010. Almost half (48%) of DEI's power output is generated using lignite, a drop from the 51.6% in 2009.
12% of Greece's electricity comes from Hydroelectric power plants and another 20% from natural gas. Between 2009 and 2010, independent companies' energy production increased by 56%, from 2,709 Gigawatt hour in 2009 to 4,232 GWh in 2010.
In 2008 renewable energy accounted for 8% of the country's total energy consumption, a rise from the 7.2% it accounted for in 2006, but still below the EU average of 10% in 2008. 10% of the country's renewable energy comes from solar power, while most comes from biomass and waste recycling. In line with the European Commission's Directive on Renewable Energy, Greece aims to get 18% of its energy from renewable sources by 2020. In 2013, according to the independent power transmission operator in Greece (ΑΔΜΗΕ) more than 20% of the electricity in Greece has been produced from renewable energy sources and hydroelectric powerplants. This percentage in April reached 42%. Greece currently does not have any nuclear power plants in operation, however in 2009 the Academy of Athens suggested that research in the possibility of Greek nuclear power plants begin.
In 2011 the Greek government approved the start of oil exploration and drilling in three locations within Greece, with an estimated output of 250 to 300 million barrels over the next 15 to 20 years. The estimated output in Euros of the three deposits is €25 billion over a 15-year period, of which €13–€14 billion will enter state coffers. Greece's dispute with Turkey over the Aegean poses substantial obstacles to oil exploration in the Aegean Sea.
A number of oil and gas pipelines are currently under construction or under planning in the country. Such projects include the Interconnector Turkey-Greece-Italy (ITGI) and South Stream gas pipelines.
The Turkey–Greece pipeline is a 296 kilometres (184 mi) long natural gas pipeline, which connects Turkish and Greek gas grids completed in September 2007.