By next April, Denver will add more than 2.5 megawatts (MWs) of solar power to 387 affordable housing buildings, cutting power costs and adding to the value of the real estate. The 668 systems are being installed through a 20-year power purchase agreement (PPA) signed by the Denver Housing Authority (DHA). The project, one of the city’s largest, will include 10,471 240-watt panels made by SolarWorld. Completion is targeted for April 2013. Under the PPA, the DHA will pay about $0.109 cents per kilowatt hour (kWh), slightly less than what it has been paying to Xcel Energy, reports The Denver Business Journal. The contract price will rise 3.5% annually compared with typical increases of 5% from the utility, the Journal reports. The solar integrator is Namaste Solar, while Oak Leaf Energy Partners handled the site planning, interconnection analysis, tax and financial structure, and negotiated the financing.