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Thermal energy grid storage using multi-junction photovoltaics

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Abstract

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.

Graphical abstract: Thermal energy grid storage using multi-junction photovoltaics

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Publication details

The article was received on 10 Aug 2018, accepted on 14 Nov 2018 and first published on 19 Nov 2018


Article type: Paper
DOI: 10.1039/C8EE02341G
Citation: Energy Environ. Sci., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    Thermal energy grid storage using multi-junction photovoltaics

    C. Amy, H. R. Seyf, M. A. Steiner, D. J. Friedman and A. Henry, Energy Environ. Sci., 2019, Advance Article , DOI: 10.1039/C8EE02341G

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