Indiana law gives some utilities (including municipal water and electric utilities and rural electric membership cooperatives) the ability to withdraw while automatically exempting other services (including municipal sewer utilities and most telecommunications services) from IURC jurisdiction. Utilities that withdraw must follow specific processes as defined by law. The OUCC's Utility Withdrawal from IURC Jurisdiction outlines the advantages and disadvantages. It also provides links to specific legal language governing withdrawal.
The agency also has answers to several frequently asked questions.
The OUCC also has information specifically on municipal utilities (http://www.in.gov/oucc/2720.htm) & REMCs (http://www.in.gov/oucc/2712.htm).