Energy production in Greece is dominated by the Public Power Corporation (known mostly by its acronym ΔΕΗ, or in English DEI). In 2009 DEI supplied for 85.6% of all 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. Another 12% 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.
Energy production in Greece is dominated by the Public Power Corporation ( known mostly by its acronym ΔΕΗ , or in English DEI ) . In 2009 DEI supplied for 85.6 % of all 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 . Another 12 % 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 .
How much of all of Greece's energy demand was supplied by DEI in 2009?
How much of all of Greece 's energy demand was supplied by DEI in 2009 ?
85.6%
85.6%