U.S. Department of Energy

Novel Molten Salts Thermal Energy Storage for Concentrating Solar Power Generation

Alabama logo Graphic of a chart with a line that goes horizontal, up, and horizontal.

DSC plot for the LiNO3-NaNO3-KNO3 ternary system showing the melting temperature.

The University of Alabama, under the Thermal Storage FOA, is developing thermal energy storage (TES) media consisting of low melting point (LMP) molten salt with high TES density for sensible heat storage systems.


They will conduct detailed tests using a laboratory-scale TES system to:

  • Investigate the thermal performance of the TES
  • Determine the lifecycle of the LMP molten salt system
  • Gauge round-trip efficiency.

The research team is also conducting investigations of corrosion behavior and material selections for a laboratory-scale TES system, as well as studies of recyclability, environmental impact, and economic and cost analysis of the optimized LMP molten salt and TES system.


Alabama's LMP molten salt is projected to have the following characteristics compared to current salts:

  • Lower melting point
  • Higher energy density
  • Lower power-generation cost

This program aims to develop a heat transfer fluid/storage medium capable of operating at temperatures >650°C, allowing for operation of higher conversion efficiency turbines. This has the potential to reduce the cost of TES to <$15/kWth and achieve round-trip efficiencies >93%.

Publications, Patents, and Awards

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Quarterly Progress Reports

CSP Program Overview

Learn about other DOE competitive awards for concentrating solar power research that are in progress.