Commission staff working document - Accompanying document to the Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions on Investing in the Development of Low Carbon Technologies (SET-Plan) - R&D investment in the priority technologies of the european strategic energy technology plan {COM(2009) 519 final} {SEC(2009) 1295} {SEC(2009) 1297} {SEC(2009) 1298}