Technology
Proven technology. Disciplined deployment.
AddiGen deploys proven, commercially mature technologies rather than developing experimental technology — engineering choices follow the needs of the power system.
Two technologies
Two technologies.
One integrated storage platform.
BESS provides rapid-response flexibility, while CAES extends storage across multiple hours and days. Combined, they serve the full spectrum of grid needs.
BESS — 1–4 HOURSBESS
Battery Energy Storage Systems
- Fast response
- Shorter duration
- Grid services
- Balancing
CAES — MULTI-HOUR TO MULTI-DAYCAES
Compressed Air Energy Storage
- Long duration
- Multi-hour to multi-day
- Security of supply
- Renewable integration
Discharge duration — system role
Horizontal duration scaleBESS — Battery Energy Storage Systems
- Fast response
- Shorter duration
- Grid services
- Balancing
CAES — Compressed Air Energy Storage
- Long duration
- Multi-hour to multi-day
- Security of supply
- Renewable integration
| Attribute | BESS | CAES |
|---|---|---|
| Primary role | Fast response, grid services, balancing | Long-duration energy shifting, security of supply |
| Duration | Shorter duration — typically up to 4 hours | Multi-hour to multi-day |
| Renewables | Balances short-term variation | Integrates high shares of wind and solar |
| Grid role | Grid services | Security of supply |
| Typical use case | Short-duration flexibility | Shifting surplus power across hours and days |
| Technology maturity | Commercially mature | Commercially mature — decades of operation |
How CAES works
Compressed air. Geological scale.
Compressed Air Energy Storage stores surplus electricity as pressurised air in deep underground salt caverns — and returns it to the grid when the system needs it.
Charging
Surplus electricity — often from wind and solar at times of low demand — drives compressors that push air into deep underground salt caverns at high pressure.
Storing
Compressed air is held in the geological salt formation, sealed and inert. Storage capacity is measured in gigawatt-hours and does not degrade between cycles.
Discharging
When the grid needs power, air is released, heated and expanded through turbines that generate electricity — for hours or days at a time.
CAES configurations
Diabatic and adiabatic operation.
Two configurations of CAES differ in how heat is handled across the storage cycle.
Diabatic CAES
Heat introduced during generation.
AddiGen's current projects use Diabatic CAES.
Adiabatic CAES
Heat generated during compression is captured and reused.
The Danish Green Hydrogen Hub project uses green hydrogen as its fuel source.
AddiGen's current projects use Diabatic CAES. The Danish Green Hydrogen Hub project uses green hydrogen as its fuel source — a credible pathway toward lower-carbon long-duration storage.
Technology selection principles
Six tests every technology must pass.
System requirements
Technologies are selected against the needs of the power system, not the other way around.
Proven engineering
Deployed at commercial scale for decades, with established supply chains and operating records.
Scalability
Capacity scales with geology and grid need — from tens of megawatts to multi-gigawatt portfolios.
Long asset life
Infrastructure measured in multi-decade operating horizons, not product cycles.
Net-zero compatibility
Storage that enables higher shares of renewable generation across European grids.
Lower-carbon pathway
A credible route to decarbonised long-duration storage, including green-hydrogen-fuelled operation.
Contact AddiGen
Discuss infrastructure with AddiGen.
For enquiries regarding investment opportunities, partnerships, grid integration or our project pipeline, please get in touch.