Canadian Solar Inc. (CSI) designs, develops, and manufactures solar wafers, cells and solar module products that convert sunlight into electricity for a variety of uses. Its products include a range of solar modules built to general specifications for use in a range of residential, commercial and industrial solar power generation systems. Specialty solar modules and products consist of customized solar modules that its customers incorporate into their own products, such as building integrated photovoltaic modules modules. In October 2013, it announced that BlackRock acquired from Canadian Solar two utility-scale solar power plants totaling 20MW (AC). In December 2013, its subsidiary, CSI Holdco LLC sold two utility-scale solar power plants totaling 4.4 mega watts DC to Public Service Enterprise Group Inc subsidiary, PSEG Solar Source. In March 2014, the Company announced the opening of Microgrid Testing Centre.