Power generation and Fiber are top issues is data center site selection. Curious I found this site as a useful Directory of Network Maps based on the providers. The list is over 30 providers, so there is still manual work to go through all of them, but at least this is a starting point. Here are the first 11.
Company
Network Map360Networks
Interactive MapAbovenet
Network MapsAT&T
Domestic OC-768, See International Maps
BT Global Services
Network MapCenturyTel
Network MapChina Telecom
Network MapCogent Communications
See International MapsCovad
Network MapCox Business
Interactive MapDarkstrand
Interactive MapGlobal Crossing
See International Maps