PARIS: French gas consumption fell 5 percent to 442 terawatt hour (TWh) in 2018 compared with the previous year due to high temperatures and less use of gas-fired power generators, gas network operator GRTgaz said on Thursday.Industrial gas demand rose for the fifth year in a row as more industries switch from oil and coal power generation to gas, GRTgaz said, adding that conversion to gas power generation represented 2.5 TWh of consumption.