Conversion Tower for Dispatchable Solar Power



Program:
HEATS
Award:
$1,555,200
Location:
Lakewood,
Colorado
Status:
ALUMNI
Project Term:
01/11/2012 - 07/31/2014

Critical Need:

There is a critical need to find efficient, cost-effective thermal energy storage solutions to maximize the use of domestic solar and nuclear energy resources. Most utility-scale solar power plants only run at about 25% of their capacity because they can't generate power at night—thermal energy storage makes it possible to increase this capacity to up to 60-75%. Similarly, nuclear power plants produce a constant output of power—thermal energy storage could help increase this output during times of critical peak demand.

Project Innovation + Advantages:

Abengoa Solar is developing a high-efficiency solar-electric conversion tower to enable low-cost, fully dispatchable solar energy generation. Abengoa's conversion tower utilizes new system architecture and a two-phase thermal energy storage media with an efficient supercritical carbon dioxide (CO2) power cycle. The company is using a high-temperature heat-transfer fluid with a phase change in between its hot and cold operating temperature. The fluid serves as a heat storage material and is cheaper and more efficient than conventional heat-storage materials, like molten salt. It also allows the use of a high heat flux solar receiver, advanced high thermal energy density storage, and more efficient power cycles.

Potential Impact:

If successful, Abengoa would reduce the cost of solar energy generation by 30% compared to existing state-of-the-art storage technologies—significantly reducing the cost of renewable solar electricity.

Security:

Cost-effective thermal energy storage would enable increased use of domestic energy resources like solar and nuclear—strengthening the nation's energy security.

Environment:

Cost-effective thermal energy power generation could help decrease fossil fuel-based electricity use and harmful emissions from coal-burning power plants.

Economy:

Thermal energy storage systems could make it less expensive to generate power from nuclear and renewable solar energy, which in turn could help stabilize electricity rates for consumers.

Contact

ARPA-E Program Director:
Dr. James Klausner
Press and General Inquiries Email:
ARPA-E-Comms@hq.doe.gov

Partners

Barber Nichols
Abener
Impact Technology Development
Sandia National Laboratory

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Release Date:
09/29/2011