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Issue 1, 2019
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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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Submitted
10 Aug 2018
Accepted
14 Nov 2018
First published
19 Nov 2018

This article is Open Access

Energy Environ. Sci., 2019,12, 334-343
Article type
Paper

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, 12, 334
DOI: 10.1039/C8EE02341G

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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