Canadian Solar Inc., together with its subsidiaries, designs, develops, manufactures, and sells solar ingots, wafers, cells, modules, and other solar power products. The company operates through two segments, Module and System Solutions (MSS), and Energy. The MSS segment engages in the design, development, manufacture, and sale of a range of solar power products, including standard solar modules, specialty solar products, and solar system kits that are a ready-to-install packages comprising inverters, racking systems, and other accessories. It also provides engineering, procurement, and construction; and operation and maintenance (O&M) services. This segment's energy solution products include solar inverters and energy storage systems for utility, commercial, residential, and specialty product applications. Its O&M services include inspections, repair, and replacement of plant equipment; and site management and administrative support services for solar power projects. The Energy segmen