This is the final approval required to complete the merger which is expected to create the largest system of affiliated natural gas-only distribution firms in the US based on customer count, serving about 4.5 million customers in seven states.
The companies filed a joint application with the Illinois Commerce Commission in January 2011 for approval of their merger.
AGL Resources is a US-based energy services company and serves about 2.3 million customers in six states.
The primary business of Nicor is Nicor Gas, a US-based natural gas distribution company.