Thermal Energy Grid Storage Using Multi-Junction Photovoltaics

Myles Steiner, Daniel Friedman, Caleb Amy, Hamid Seyf, Asegun Henry

Research output: Contribution to journalArticlepeer-review

101 Scopus Citations


As the cost of renewable energy falls below fossil fuels, the key barrier to widespread sustainable electricity has become availability on demand. Energy storage can enable renewables to provide this availability, but there is no clear technology that can meet the low cost needed. Thus, we introduce a concept termed thermal energy grid storage, which in this embodiment uses multi-junction photovoltaics as a heat engine. We report promising initial experimental results that suggest it is feasible and could meet the low cost required to reach full penetration of renewables. The approach exploits an important tradeoff between the realization of an extremely low cost per unit energy stored, by storing heat instead of electricity directly, and paying the penalty of a lower round trip efficiency. To understand why this tradeoff is advantageous, we first introduce a general framework for evaluating storage technologies that treats round trip efficiency, as well as cost per unit energy and power, as variables.

Original languageAmerican English
Pages (from-to)334-343
Number of pages10
JournalEnergy and Environmental Science
Issue number1
StatePublished - Jan 2019

Bibliographical note

See NREL/JA-5900-73887 for correction

NREL Publication Number

  • NREL/JA-5900-72337


  • energy storage
  • high temperature thermal storage
  • thermophotovoltaics


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