Washington DC will host on March 1 and 2 an Energy Innovation Summit, focusing on ARPA-E.
One important theme is the latest with venture capital and cleantech. See, for example, the blog post on the National Venture Capital Association webpage, which is helping to support the event: :http://nvcaccess.nvca.org/index.php/topics/events/179-arpa-e-summit-kicks-off-in-dc.html
Another important theme which may emerge is the role of natural gas, particularly gas derived from shale, together with the various alternative energies. For example, one morning panel for March 2 is called "Changing the Game in Natural Gas: The Role of Breakthrough Technologies." For more details, the agenda is linked here.