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Energiespeichersysteme: von der Theorie in die PraxisHightech Zentrum Aargau AG
October 20th 2015
A sustainable energy storage solution built in the Swiss Alps
Company overview
Airlight Energy is a Swiss private company that supplies proprietary solar technologies
for large-scale production of electricity and thermal energy, and for energy storage. It has developed
innovative and complete solutions for the markets of Concentrated Solar Power (CSP), Concentrated
Photovoltaic (CPV) and energy storage (Advanced Adiabatic Compressed Air Energy Storage AA-CAES).
Airlight Energy Holding SA
100 % 70 % 100 %100 %
Airlight Energy Manufacturing SA
Airlight Energy IP SA
Airlight Energy Maroc Sarl AU
Airlight Energy USA Ltd
Airlight Energy Group
Scientific partnerships Commercial & technical agreements
Grants
BFE (Swiss Federal Office of Energy) 2.5 mio CHF
KTI (Confederation Innovation’s Agency) 1.8 mio CHF
Cantone Ticino 0.6 mio CHF
IRESEN - Morocco 0.4 mio CHF
Introducing ALACAES
• ALACAES, a Swiss private company, is a subsidiary of Airlight Energy that is developing an advanced adiabatic compressed air energy storage (AA-CAES) solution for large-scale electricity storage
• ALACAES is born in 2012 as a spin-off of Airlight Energy aimed at concentrating the know-how developed in the field of energy storage technologies in a single, dedicated company
Why Electricity Storage?
Source: EWI/Prognos/GWS – Energy reference forecast, 2014
German Electricity Production Forecast
in %
Why Electricity Storage?
German wind energy production at selected days in April 2011
in MW
Source: RWE
• Gas burner to heat the compressed air • Salt cavern for air storage • 3h of production with a storage capacity of 640 MWh• Efficiency: 40%
• Gas burner and heat recuperation • Salt cavern for air storage, • 26h of production with a storage capacity 2860 MWh• Efficiency: 54%
• Air is compressed using excess electricity from the grid and stored in underground caverns
• Compressed air is later expanded in turbines to generate electricity
• Compression generates heat that is dissipated to the environment
• In release mode air is heated by means of a fossil fuel burner
Conventional CAES Technology
Existing Plants:Huntorf (DE) in 1978
McIntosh (US) in 1991
Heat recovery allows a global
efficiency of above 72%Zero CO2
Up to several GWh
of storage capacity No electricity
needed for start-up (Black-start)
<5 min
of ramping times
the heat generated at the
compression stage is first stored and then used at the expansion stage
TESsystems
Wit
h
Existing CAES plants
ALACAES’ Solution
ALACAES Technology
ALACAES Technology - The Thermal Energy Storage
• High round-trip efficiency >95%
• Mechanical stability due to concrete walls and conical shape
• Abundant and cheap storing material (gravel)
• No solidifying problems like molten salt
• Direct heat transfer between storage material and working fluid (no HX needed)
• No degradation or chemical instability
• No use of chemicals and corrosive material
• No safety concerns
100 MWhth Industrial scale TES developed by Airlight Energy and the hot rocks during TES operation
char
gin
g
dis
char
gin
g
Key advantages of Airlight Energy’s TES solution:
Exploiting Airlight Energy’s Thermal Energy Storage (TES) solution, based on a packed bed of rocks
ALACAES Technology
• Use of mountains as the air pressure cavern – easily accessible and vast experience from gas storage caverns
• Packed bed of rocks TES developed for CSP technology – high round-trip efficiency, high reliability
• Placement of the TES inside the pressure cavern – TES tank not pressurized, costs and complications of the TES solution significantly reduced
• Placement of the turbomachinery inside the mountain – reducing the visibility of the plant and therefore its public acceptance, vast experience from pumped hydro plants
ALACAES Technology
ALACAES Application
Test-Plant :Placed in an unused tunnel in the Swiss Alps Budget: 4 mio CHF; 40% financed by BfE
500 MWh Plant
Test-PlantLayout
Test-PlantLayout
Test-Plant
Test-Plant
Test-Plant
Test-Plant
Test-Plant
• Use an existing underground cavity with no special lining to store compressed air
• Determine the rock-mass behaviour of the storage cavern under load cycles
• Test the rock permeability and the airtightness of the sealing system
• Test in real dimension the efficiency of Airlight Energy’s TES system in a pressurized ambient
• Assess the functionality of the mechanical equipment
• Face the difficulties for the realization and operation of a plant in real scale
The ALACAES Test-Plant
2013 2014 2015 2016
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2
Project Definition
Preparatory Work
Civil Works
Electromechanical installations
Commissioning
Testing Phase
Test-PlantRealization Timeline
: Milestone
Test-PlantShifting the maturity level of AA-CAES
With the Pollegio test plant ALACAES is pushing AA-CAES towards the demonstration and deployment phase
Item Unit Value Comment
Power MW 100
Capacity MWh 500 5h at peak power
Round-Trip efficiency % 70%
Plant lifetime Years 60
Output degradation % / Year 0.25%Since operation starts until power island maintenance (every 15 years)
Item Price (k€)
CAPEX 72’500145 €/kWh
Item Price (k€)/year
OPEX 1’213average per year
ALACAES Cost Estimate (CAPEX & OPEX)
Summary
• ALACAES is developing an advanced adiabatic compressed air energy storage technology using the thermal energy storage of Airlight Energy
• With the ALACAES technology, the efficiency of CAES is significantly improved to above 70%
• First world-wide AA-CAES plant under construction in the Swiss Alps with a budget of 4 mio CHF, financed 40% by BfE
• Very low environmental impact and almost no visible footprint
• Highly competitive with pumped hydro storage
Airlight Energy Holding SAVia Industria 106710 BiascaSwitzerland
www.alacaes.com
Follow the construction of our pilot plant on Twitter : @ALACAES