The Energy Technologies Institute, backed by Royal Dutch Shell Plc (RDSA) and BP Plc, invested 15.5 million pounds ($25 million) in the U.K. to build the world’s longest turbine blades to try to curb offshore wind costs.

It will build blades as long as 100 meters (328 feet) for turbines at sea, Loughborough, England-based ETI said today in a statement. Offshore blades are currently 60 to 75 meters long.

Britain is encouraging technologies that reduce the cost of offshore wind, now at about 161 euros ($210) a megawatt-hour, according to Bloomberg New Energy Finance. The government, also a backer of ETI, is trying to cut the level to 100 pounds ($161) a megawatt-hour by 2020 to spur offshore wind projects.

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