Clean energy remains one of the strongest and most vital sectors reshaping the global landscape.Clean-energy deployments are proving economically viable in a number of key markets. Add in tax credits, low-cost utility financing, and other pricing schemes, and some utilities, like Southern California Edison, are stating that they can deploy solar PV for even less than new natural gas-fired generators at the wholesale level.This report looks deeper at five of the key trends that is believed to shape clean-energy markets in 2011 and beyond.