Compressed air energy storage for real estate and industry

Combines battery and heat pump in one system, uses only air and water.

Reduce energy costs

Combines electricity, heating and cooling and pays for itself in 3-7 years

Reduce emissions

Integrates renewable energy sources and replaces fossil fuels

Increase sustainability

Uses only air and water with a service life of 20 years

Our customers

How the compressed air energy storage system (CAES) works

The innovative and sustainable energy storage system from Green-Y is based on patented compressed air technology, which stores electricity and also generates heat and cold in a single system. It uses air and water and has a service life of 20 years. The combined approach and the modular structure of the system promise amortization periods of 3 – 7 years.

When charging the storage tank, air is compressed using electricity and stored in compressed air cylinders at up to 300 bar. Compression generates heat at a temperature of up to 60°C, which can be used for heating buildings, hot water or as process heat.

When the storage tank is discharged, the air from the storage cylinders is expanded and generates electricity via a generator. During expansion, the temperature drops to up to 3°C. The resulting cold can be used for room cooling, server cooling or as industrial process cooling.

Fields of application

Commercial site with compressed air energy storage

Housing estate with compressed air energy storage

In the office building, the system stores surplus PV electricity or is charged from the grid during off-peak periods. The electricity generated reduces power peaks during the day. The heat is used to heat rooms in winter, dehumidify the air in summer and heat water all year round. The cold cools the building in summer and the server rooms and laboratories all year round. The system pays for itself in 5 years: The stored energy reduces annual energy costs, while heating and cooling also reduce investment costs in other systems.

Office building, Switzerland Innovation Park Biel

In industrial applications, the stored electricity reduces power peaks during production times. The heat and cold generated during storage can be used in industrial processes all year round: The heat at a temperature level of up to 60°C and the cold up to 3°C. The system pays for itself within 5 years: The stored energy reduces the annual energy costs, and the heat and cold provided means that other generation plants can be designed much smaller and the associated costs can be significantly reduced.

Industry & business, Buri Energy

In the residential area, the system doubles the self-consumption of the solar power generated on site to over 80%, which means that the residential area can be self-sufficient in energy for almost 6 months. The stored electricity reduces power peaks in the morning and evening. The heat is used to heat rooms in winter and to heat water all year round, while the cold cools the building in summer. The system is amortised within 5 years: The stored energy reduces the annual energy costs, the heat provided can significantly reduce the district heating grid connection and the associated costs.

Residential area, Alfred Müller

Any questions about our energy storage system?

Do you still have questions about use cases and our technology? You will find initial answers in the FAQs below. If you are interested, please contact us directly.

FAQs

How does the compressed air energy storage system from Green-Y work?WyssmannLLC2024-03-06T09:25:42+01:00

How does the compressed air energy storage system from Green-Y work?

The compressed air energy storage system from Green-Y primarily uses renewable energy sources such as solar energy to compress air and store it in pressurized cylinders. When required, the compressed air is released again and converted into electricity. A special feature is the use of the heat and cold generated during the charging and discharging processes, which are integrated into the building’s energy cycle or industrial processes in order to save energy.

What is a compressed air energy storage system?WyssmannLLC2024-03-06T09:25:51+01:00

What is a compressed air energy storage system?

A compressed air energy storage system is a system that stores electricity in the form of compressed air. The compressed air is compressed and stored in pressure cylinders at 300 bar. When energy is required, the compressed air is released again and converted into electricity.

What are the advantages of a compressed air energy storage system over a battery storage system?WyssmannLLC2024-03-06T09:25:36+01:00

What are the advantages of a compressed air energy storage system over a battery storage system?

Selected advantages of our compressed air energy storage system compared to a battery storage system:

Cost efficiency: The combined approach of electricity storage, heat and cold generation as well as the cost-effective storage of energy in storage cylinders makes the system economically attractive, especially in larger projects or in industrial and commercial environments.
Heat and cold recovery: The system harnesses the heat and cold generated during charging and discharging processes, thereby increasing energy efficiency and cost-effectiveness.
Sustainability: The system works exclusively with air and water, uses no rare raw materials and is 100% recyclable.
Longevity: At 20 years, the system has a significantly longer service life compared to battery storage systems with less than 10 years. The storage cylinders themselves even have a service life of 50 years.
Modularity: The system can be easily adapted to different project sizes and requirements, and the output and storage volume can be designed flexibly and independently of each other.

It should be noted that the choice of the best storage type always depends on the specific requirements and conditions of the project.

What are the disadvantages of a compressed air energy storage system?WyssmannLLC2024-03-06T09:25:20+01:00

What are the disadvantages of a compressed air energy storage system?

The disadvantages of a compressed air energy storage system include the limited efficiency in converting electrical energy into pneumatic energy and vice versa, as well as the need for large storage tanks in order to store sufficient energy.

Where are compressed air energy storage systems used?WyssmannLLC2024-03-06T09:25:21+01:00

Where are compressed air energy storage systems used?

Compressed air energy storage systems are often used in conjunction with renewable energy sources such as wind turbines and solar power plants. However, they can also be used in industrial systems and as an emergency power supply.

How big is the Green-Y compressed air energy storage system?WyssmannLLC2024-03-06T09:25:07+01:00

How big is the Green-Y compressed air energy storage system?

The compressed air energy storage system from Green-Y is specially designed for use in residential areas, commercial buildings and industry. One particular advantage is the scalable storage tanks, which make it possible to optimize the storage volume for each individual project.

The energy density is around 25 kWh/m3.

How long can a compressed air energy storage system store energy?WyssmannLLC2024-03-06T09:24:56+01:00

How long can a compressed air energy storage system store energy?

The storage duration of a compressed air energy storage system depends on various factors, such as the size of the storage system, the available energy source and the type of use.

As a rule, the compressed air energy storage unit stores energy for several hours. From a technological point of view, there is no self-discharge, which means that longer storage periods of several days and seasonal storage are also possible.

How efficient is the compressed air energy storage system from Green-Y?WyssmannLLC2024-03-06T09:24:49+01:00

How efficient is the compressed air energy storage system from Green-Y?

The efficiency of a compressed air energy storage system depends on various factors, such as the efficiency of compression and expansion, the pressure loss in the system and the losses during heat dissipation. Conventional compressed air energy storage systems generally achieve electrical efficiencies of between 50 and 70 percent.

The pure electrical efficiency of Green-Y will reach a value of up to 60%. The system also provides heating and cooling, which significantly increases the overall efficiency.

How much does a compressed air energy storage system cost?WyssmannLLC2024-03-06T09:24:39+01:00

How much does a compressed air energy storage system cost?

The cost of a Green-Y compressed air energy storage system can depend on various factors and usually varies depending on the application and the desired storage capacity. A typical system size with 150kW electrical output and 4 hours of storage costs around CHF 300,000.

We at Green-Y are happy to advise and support you with your projects. Our experts are on hand to help you choose the right compressed air energy storage system for your specific requirements and provide you with transparent information on the associated benefits and costs.