Globally data centers are currently buying $30 billion of power per year, but changes in the power market are rippling through the Internet industry, altering both the location of data centers and their sources of power. This report parses the many complications of picking a data center location, which we call data-center siting. Siting includes considerations beyond the geographic location, such as how to procure energy and green-energy models, all to run better on a new, ever-shifting energy infrastructure. This report will help decision makers like CIOs and data-center planners weigh the most important parameters behind locating new data centers, whether in the U.S. or globally. Doing so will lead to more cost-effective, reliable and sustainable data centers.