Compressed Air Energy Storage

We are your compressed air energy storage solution provider

Siemens CAES is a comprehensive, proven, grid-scale energy storage solution. We support projects from conceptual design through commercial operation and beyond. Our CAES solution includes all the associated above ground systems, plant engineering, procurement, construction, installation, start-up services and long term service support.

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Product Information

What makes Siemens CAES the preferred choice?

Siemens CAES improves utilization of renewable energy resources by absorbing GW-hours of energy that would otherwise be curtailed and provides grid balancing and reserve services with lower fuel usage and carbon footprint than other controllable resources.

Cycle Overview

SXT-800 CAES Cycle Schematic

Proven components packaged for a new market

CAES expansion train

Expansion Train

Flexible and efficient power generation with 90 percent turndown of rated output

  • 160 MW and 140MW design output 
  • 90 percent turndown 
  • 20 percent ramp rate per minute
  • 10 minute start-up to reach full generation
  • Dual re-heat recuperator
  • H2 co-firing

 

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CAES compression train

Compressor Train

Flexible and efficient load absorption with 30 percent turndown of rated output

  • Up to 120 MW per compression train
  • 30 percent turndown
  • 30 percent ramp rate per minute
  • 4 minute start-up to reach full load

 

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Plant solutions

Plant Solutions

One of the most important challenges today is the decarbonization of the global economy. The key to meeting this challenge is to consistently expand renewable energy sources and integrate them in developed industry, energy, and mobility infrastructures.

 

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Benefits

  • Responds quickly - Designed to be started and brought to full load in less than 10 minutes, eliminating the need for intermediate-load plants and providing a cost-effective way to meet spinning reserve requirements. 
  • CAES generation also has excellent load-following capability and exceptional part-load efficiency. 
  • Full compression can be available in less than five minutes to quickly absorb load rather than reducing your base load generation.
  • Flexible cycling options - The CAES plant allows for independent operation of the compression and expansion systems, allowing for simultaneous load absorption and balancing.
  • Generation efficiency - Relatively flat heat rate across all operating ranges, thus overall generation efficiency is near the same at 10 percent as it is at 100 percent.
  • Days of storage - The intermittency of renewables coupled with unpredictable weather patterns means the reality of long periods where balancing is paramount to absorbing renewables. 

Applications

CAES is the ideal solution for energy and ancillary services including:

  • Load leveling / balancing
  • Ramping regulation
  • Frequency oscillation
  • Transmission optimization
  • VAR support

Performance Summary

Power Output

System Flow

LHV Heat Rate

LHV Fuel Usage

MW
lbm / s
BTU / kWh
lbm / s
160
317
3855
8.5
105
226
3881
5.6
85
199
3906
4.6
65
168
3940
3.5
50
147
3980
2.7
35
116
4035
1.9
20
87
4208
1.2
16
73
4254
0.9
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