LONDON- * Shell Energy Europe Limited, the energy marketing and trading division of Royal Dutch Shell RDSa.L has agreed a multi-year supply deal for power from a battery storage project in southwest England, the company said on Monday.

* The 100-megawatt (MW) power storage project is backed by China Huaneng Group and Chinese sovereign wealth fund CNIC, and is expected to be completed by the end of 2020.

* The two 50-MW batteries will enable Shell Energy Europe and its subsidiary Limejump to use renewable power in the area, the firm said.

* When fully charged, a 100-MW battery could hold 100 megawatt hours of electricity, enough to power about 10,000 homes for a day before being recharged.

(Reporting by Nina Chestney Editing by Helen Popper ) ((nina.chestney@thomsonreuters.com; +44 (0)207 542 8071; Reuters Messaging: nina.chestney.thomsonreuters.com@reuters.net))