ATHENS, Oct 10 (Reuters) - Power generation from renewables fully covered Greece's electricity demand over a few hours last week, for the first time in the history of the country's electricity system, its independent power transmission operator IPTO said.IPTO said on Monday that renewables accounted for 100% of the power generation for at least five hours last Friday, reaching a record high of 3,106 megawatt hours at 0800 GMT.Like other European countries, Greece has cut its reliance on Russian gas following the war in Ukraine by increasing liquefied natural gas (LNG) imports.Register now for FREE unlimited access to Reuters.comThe share of Greek renewables from solar, wind and hydro stood at 46% of the country's power mix in the eight months to August this year, from 42% in the same period in 2021, according to Greece-based environmental think-tank The Green Tank.IPTO has been investing in expanding the country's power grid to boost power capacity and facilitate the penetration of solar, wind and hydroelectric energy."