Public Power Institute. Technology at work for the environment


Technology Areas

Environmental Impacts and Reduction
Develops new ways to minimize environmental effects of power production. Current projects include carbon sequestration, clean air partnerships, Great Smoky Mountains air quality, and rights-of-way landscaping.

Clean and Advanced Energy
Focuses on technologies for cleaner fossil-fuel power production and advanced generation. Current projects include residential fuel cells, fuel cells and microturbines, and Regenesys energy storage.

Biomass and Renewables
Works to promote and improve renewable energy technologies. Current projects include wind power, cofiring biomass
, and biomass conversion.

Energy Use and Industrial Ecology
Promotes cleaner, more efficient use of resources and energy by industry and consumers. Current projects include the frostless heat pump,
hybrid lighting, decentralized wastewater systems, and electric bicycles.

External Collaboration and Commercialization
Develops strategic partnerships to test technologies that are commercially feasible. Current projects include HVAC diagnostic testing with the EscanAC system, the Breakaway Link protective overload device, the frostless heat pump, the distribution fault anticipator and laboratory testing of BioTrans transformer oil.

About PPI
Why PPI exists and how it and its research partners advance new energy technologies. Includes information on PPI contacts, partners, and frequently asked questions.

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PPI is constructing a first-of-its-kind power plant in northern Mississippi that will work like a giant, highly efficient battery, storing electricity during periods of low demand and providing it when power usage is high.

TVA has signed a contract with Innogy Technology Ventures Limited of Great Britain, which designed the 12-megawatt plant and provided the modules that are used to store energy. The total cost of the plant is estimated at $25 million.

The plant’s technology is based on regenerative cells that store energy through a chemical process. It’s trademarked under the name Regenesys.

In November 2000, the Regenesys technology won the Most Promising Pre-Commercial Technology Development Award in the Financial Times 2000 Energy Global Awards competition. The award was conferred by Financial Times Energy, a provider of energy-industry news and information.

The TVA plant will be the first one of its type in the United States and will have the largest regenerative cells ever used.


  • The energy-storage plant is designed to improve power quality by eliminating momentary interruptions in service and maintaining voltage levels.
  • The plant will enhance system reliability while having a minimal impact on the environment.
  • The technology has the potential to change the way power systems operate by providing a means of storing electricity for significant periods of time.
  • It also will improve system reliability in the western part of the TVA power system by eliminating momentary interruptions and maintaining voltage levels.

Construction Highlights:

  • Main Process Building

  • Electrolyte Tanks

Construction is on schedule for mechanical completion by late 2004.  At that point the delivery of Electrolytes and the Regenerative Cells or Modules is possible.

Download/Print the Regenesys Fact Sheet (48 kb)



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