All Reports

Due to the importance of protecting operational technology from cybersecurity threats, we audited the security of a specific type of system access at the Tennessee Valley Authority’s (TVA) gas sites.  Our objective was to determine if a specific type of system access supporting Gas Operations was securely configured and monitored to mitigate cybersecurity threats.  We made eight recommendations to TVA management.  The specifics are being withheld from public release due to their sensitive nature in relation to TVA’s cybersecurity.

We performed an audit of costs billed to the Tennessee Valley Authority’s (TVA) by a contractor for nuclear steam supply system refueling and inspection services at TVA’s Watts Bar Nuclear Plant and Sequoyah Nuclear Plant.  The contract provided for TVA to compensate the contractor on a time and material or fixed price basis in accordance with the contract’s pricing schedule.  In addition, the contract provided that (1) outside personnel used for craft labor would be reimbursed at the contractual TVA Project Maintenance and Modification Agreement rates plus an admi

The Tennessee Valley Authority’s (TVA) Enterprise Risk Management (ERM) business unit (BU) focuses on identifying and prioritizing enterprise risks.

On October 10, 2023, the North Carolina General Assembly enacted the Clean Energy and Energy Efficiency Portfolio Standard (CEPS) requiring rural electric cooperatives and municipal electric suppliers in North Carolina to meet 10 percent of their energy needs through clean energy resources or energy efficiency measures.  Additionally, North Carolina CEPS requires a percentage of retail sales be attributed to solar, poultry, and swine resources.  The Tennessee Valley Authority’s (TVA) renewable energy certificates (REC) portfolio management process includes obtainin

The Office of the Inspector General performed an audit to determine if the backup and recovery process for operational technology cyber assets at Tennessee Valley Authority (TVA) natural gas plants were (1) designed in accordance with federal guidance and (2) operating as defined by TVA policy.

We performed an audit of costs billed to the Tennessee Valley Authority (TVA) by Facilities Technology Alliance LLC (FTA) under Contract No. 15664 for staff augmentation electrical and telecommunication services.  Our objective was to determine if costs were billed in accordance with the contract’s terms.  Our audit scope included $15.1 million in costs paid to FTA from March 6, 2023, through February 28, 2025.

Between January 1, 2022, and July 8, 2025, TVA spent about $47 million on tools across the fleet.  Due to the amount spent on tools at TVA, we performed an audit of TVA’s tool management controls.  Our audit objective was to determine if controls are in place to safeguard tools at selected sites.  Our audit scope was limited to controls in place at selected sites during our site visits which occurred between May 28, 2025, and June 17, 2025.

As part of our annual audit plan, we performed an audit of costs billed to the Tennessee Valley Authority (TVA) by Day and Zimmerman NPS, Inc. (DZNPS) for the services of qualified craft, noncraft, or staff augmented personnel to perform modification, outage, supplemental maintenance, and technical support work at TVA nuclear generating sites under Contract No. 11515.  Our audit objective was to determine if costs billed to TVA at Sequoyah Nuclear Plant were in compliance with the terms of Contract No.

We performed an audit of the Tennessee Valley Authority’s (TVA) Contract No. 13814 with Hitachi Energy USA, Inc.

During fiscal year 2024, the Tennessee Valley Authority (TVA) communicated its intent to invest approximately $7 billion over the next 20 years to ensure safe and reliable operations of its three nuclear sites.  This investment is to extend and preserve the life of its nuclear units and will be accomplished through nuclear life extension (NLE) projects. Moisture separator reheaters (MSRs) are a major plant asset that will be included in the NLE focus.  Sequoyah Nuclear Plant’s (SQN) Unit 1 includes six MSRs located at the SQN Turbine Building. These