Renewable energy is playing a larger role in data center site location, as companies seek to address energy efficiency goals and the prospect of federal carbon regulation. Sorting out the many incentive programs can be a lot of work, but is critical to assessing the economics of one state versus another.
Here's a resource that may help: The Database of State Incentives for Renewables & Efficiency (DSIRE) is a comprehensive source of information on state, local, utility, and federal incentives that promote renewable energy and energy efficiency. It maintains databases of incentives for both renewable energy and energy efficiency, broken down by state and individual utility, offering details on each program along with a link to the utility’s web site. It’s a great resource for identifying what’s available in your area(s) and accelerating the research process.