An independent transaction processing agent for wholesale electric power markets, APX processes more than 500 million megawatt hours per year for approximately 200 client companies in North America, and Europe. Services include trading platforms and brokerages, scheduling, clearing, settlement, and market infrastructure systems. A privately held company, APX has its main office in Santa Clara, Calif., and regional offices in: Connecticut; Houston, Texas; London, England; Oslo, Norway; and Stavanger, Norway.