Imperial College London


Faculty of EngineeringDepartment of Chemical Engineering

Professor of Clean Energy Technologies



+44 (0)20 7594 1601c.markides Website




404ACE ExtensionSouth Kensington Campus






BibTex format

author = {Georgiou, S and Shah, N and Markides, C},
doi = {10.1016/j.apenergy.2018.04.128},
journal = {Applied Energy},
pages = {1119--1133},
title = {A thermo-economic analysis and comparison of pumped-thermal and liquid-air electricity storage systems},
url = {},
volume = {226},
year = {2018}

RIS format (EndNote, RefMan)

AB - Efficient and affordable electricitystorage systemshave a significant potential tosupport thegrowth and increasingpenetration of intermittent renewable-energy generationinto the gridfrom an energy system planning and management perspective,whiledifferencesin the demand and price ofpeak and off-peak electricity can make its storage of economicinterest. Technical (e.g.,roundtrip efficiency,energy andpower capacity)as well aseconomic (e.g.,capital, operating and maintenance costs)indicators are anticipatedto have a significantcombined impact on the competitiveness of anyelectricity storage technology or systemunder considerationand, ultimately, will cruciallydetermine their uptake and implementation.In this paper,we present thermo-economicmodels of two recentlyproposedmedium-to large-scale electricity storage systems, namely ‘Pumped-Thermal Electricity Storage’ (PTES) and ‘Liquid-Air Energy Storage’ (LAES), focusing on system efficiency and costs. The LAESthermodynamic model isvalidated against datafrom anoperationalpilot plant in the UK; no such equivalent PTES plant exists, although one is currently underconstruction. Ascommonwith most newly proposedtechnologies, the absenceof cost dataresults tothe economic analysis and comparisonbeinga significant challenge.Therefore, acosting effort for the two electricity storage systems that includes multiple costing approaches based on the module costing technique is presented,with the overriding aim of conducting a preliminary economic feasibility assessment and comparison of the two systems. Based on the results, it appears that PTES has the potential to achievehigher roundtrip efficiencies,althoughthis remains to be demonstrated. LAESperformance isfound to be significantly enhanced through the integration and utilisation of waste heat (and cold)streams.In terms of economicson the other hand,and at the
AU - Georgiou,S
AU - Shah,N
AU - Markides,C
DO - 10.1016/j.apenergy.2018.04.128
EP - 1133
PY - 2018///
SN - 0306-2619
SP - 1119
TI - A thermo-economic analysis and comparison of pumped-thermal and liquid-air electricity storage systems
T2 - Applied Energy
UR -
UR -
UR -
VL - 226
ER -