Tennessee Valley Authority OIG

Due to the importance of protecting the Tennessee Valley Authority (TVA) operations from external cyber events, we audited TVA’s protection mechanisms for a specific cyberattack. Our objective was to determine if TVA’s protection mechanisms to prevent or protect against a specific type of...

Due to the importance of security measures required to protect the Tennessee Valley Authority’s (TVA) information and operations from cybersecurity threats, the OIG performed a penetration test of TVA’s network, systems, and applications. Our objective was to determine if vulnerabilities and other...

Demand Response (DR) programs offer incentives for electric utility customers to reduce their energy use during peak demand which reduces the need for generation and helps offset market purchases during times of peak cost. TVA is expanding its portfolio and plans to invest more than $1.5 billion in...

The Tennessee Valley Authority (TVA) has 109 conventional hydroelectric generating units with a capacity of 3,783 megawatts (MW). The hydro fleet supports TVA’s mission of providing clean, reliable, and affordable electricity to people and businesses of the Tennessee Valley. As of 2021, 53 of TVA’s...

We are pleased to present our report for the period April 1, 2025, to September 30, 2025. In this semiannual period, our audit, evaluation, and investigative activities identified more than $31.4 million in questioned costs; funds to be put to better use; recoveries, fees, and savings; and...

In keeping with its responsibilities under the Inspector General Act of 1978, as amended, the OIG monitored the audit of TVA's fiscal year 2025 financial statements performed by Ernst and Young LLP (EY) to assure their work complied with Government Auditing Standards . Our review of EY's work...

We performed an audit of costs billed to the Tennessee Valley Authority (TVA) by Kiewit Power Constructors Company (Kiewit) under Contract No. 13156 for work performed in support of TVA’s coal combustion residual conversion program. Our audit objective was to determine if the costs billed to TVA...

The Office of the Inspector General (OIG) performed the procedures, which were requested and agreed to by Tennessee Valley Authority management solely to assist management in determining the validity of the Winning Performance (WP)/Executive Annual Incentive Plan measures for fiscal year (FY) ending...

The Occupational Safety and Health Administration states that establishing a safety and health program is one of the most effective ways of protecting workers. The Tennessee Valley Authority (TVA) Standard Programs and Processes (SPP) 18.004, Contractor Safety Management , establishes the contractor...

The Tennessee Valley Authority (TVA) operates four coal plants, which are required to comply with the Clean Air Act (CAA). In 2023, changes to the CAA required the reduction of nitrogen oxide (NOx) from power plants. To comply with the changes, TVA made the decision to install Selective Catalytic...