text_combined: five tx power plants go commercial month texas power plants add 2 775 mw month five power plants 2 775 mw new generating capacity tested ercot operating commercially end month 500 mw unit 2 fpl lamar county plant expected commercial soon calpine 545 mw expansion pasadena plant harris county running yet gone commercial lg e power services 400 mw gregory power partners plant san patricio county american national power 500 mw midlothian plant ellis county set go commercial within days 830 mw tenaska frontier plant grimes county testing since may also set go