MANILA Electric Co. (Meralco) on Monday said that affiliate Vantage Energy had signed a retail electricity supply agreement with the Gokongwei Group to supply power to several properties under JG Summit Holdings, Inc. Vantage Energy will power 35 properties held by JG Summit subsidiaries across the country, including those operated by Robinsons Land Corp., Robinsons Supermarket Corp. and Universal Robina Corp.