In 2010 the Tennessee Regulatory Authority (TRA) approved the Chattanooga Gas Co.'s request to implement an EnergySmart Conservation program. (Docket No. 09-00183)

In April 2013, Tennessee enacted legislation which provides for alternative regulatory methods to allow for public utility rate reviews and cost recovery for investments in infrastructure replacement and expansion in lieu of a general rate case. In particular, the bill allows the Tennessee Regulatory Authority (TRA) to authorize the recovery of costs related to infrastructure expansion for the purpose of economic development, if such costs are found to be in the public interest. Expansion of economic development infrastructure may include that associated with alternative motor vehicle transportation fuel, combined heat and power installations in industrial or commercial sites, or that which will provide opportunities for economic development benefits in the area to be directly served by that infrastructure.

In April 2013, Tennessee enacted legislation which provides for alternative regulatory methods to allow for public utility rate reviews and cost recovery for investments in infrastructure replacement and expansion in lieu of a general rate case. In particular, the measure allows the Tennessee Regulatory Authority (TRA) to approve cost recovery mechanisms to recoup operational expenses and/or capital costs associated with infrastructure replacement that is necessary to comply with federal and state safety requirements and/or ensuring reliability. Piedmont Gas utilizes this rider. In May of 2015, Atmos Energy received approval from the Tennessee Regulatory Authority to implement an Annual Review Mechanism, which will allow the company to adjust its rates annually to reflect higher capital investment and higher O&M costs relating to infrastructure replacement and other factors.

Piedmont Natural Gas owns a CNG Station in Nashville, TN and has a Natural Gas Vehicle Service rate schedule (Rate schedule No. 342) in its tariff. This rate is available to any Customer in the area served by the Company in the State of Tennessee for the consumption of natural gas as a motor fuel, upon application to and consent by the Company to such Service. In July of 2014, Piedmont Natural Gas opened a CNG Station in South Nashville. WEC Energy Corp. subsidiary Trillium CNG owns and operates stations in West Memphis, Jackson, Nashville and Memphis.

Weather normalization adjustment (WNA) riders are in place for Atmos Energy, Chattanooga Gas and Piedmont Natural Gas. In 2010, the TRA authorized Chattanooga Gas (CG) to implement a full revenue decoupling mechanism for its residential and small commercial customers on a three-year pilot basis subject to certain limitations. The order also allowed the company to implement associated energy efficiency programs. Although the mechanism technically expired on May 31, 2013, in June 2013, the Authority authorized CG to continue operating under the mechanism while the TRA reviews the company's petition to extend the rider. A WNA rider is also in place for CG's industrial, commercial, and other customers that do not operate under the aforementioned decoupling mechanism. In May of 2015, Atmos Energy received approval from the Tennessee Regulatory Authority to implement an Annual Review Mechanism, which will allow the company to adjust its rates annually to reflect higher capital investment and higher O&M costs relating to infrastructure replacement and other factors.