U.S. maps of states where energy deregulation has occurred are found on EnerNOC, Save On Energy and the U.S. Energy Information Administration websites. Maps include both electric and gas information, as of November 2015.
The map presented by the U.S Energy Information Administration contains information collected in 2010, but also offers details about restructuring activities. Save On Energy's map, created from 2013 data, is linked to information about energy companies and pricing. EnerNOC's map is part of a 2014 article that also offers information about how deregulation came about and what it means to the consumer.
Since the energy market is volatile, many states have explored deregulation and suspended their activities or are just beginning to open up markets, so maps require frequent updates to maintain accuracy.