Compressed air energy storage projects under construction in 2025

What is compressed air energy storage (CAES)?

1. Introduction Compressed Air Energy Storage (CAES) has emerged as one of the most promising large-scale energy storage technologies for balancing electricity supply and demand in modern power grids. Renewable energy sources such as wind and solar power, despite their many benefits, are inherently intermittent.

How does compressed air work in Australia?

The compressed air is sent down a shaft into a purpose-built underground cavern. When energy is required, compressed air is sent back up the shaft to drive a turbine, which generates electricity that can be used to stabilize the local grid, provide energy for Broken Hill, or be sold into Australia’s National Electricity Market (NEM) grid.

Is large-scale storage a viable source of peak power and ancillary grid services?

Over the years, it has proven a stable source of peak power and ancillary grid services for the region. Completed in 2012, the Gaines CAES project in Texas (500 MW) further demonstrated the viability of large-scale storage in salt formations.

Where is compressed air stored?

Storage: The compressed air is stored, typically in large underground caverns such as salt domes, abandoned mines, or depleted natural gas reservoirs. Above-ground alternatives include high-pressure tanks or specially designed vessels, though these are generally more expensive and limited in capacity.

Is CAES a long-term energy storage solution?

By 2012, with the Gaines, Texas, project (500 MW capacity) and other pilot programs, the idea of CAES as a large-scale, long-duration energy storage solution gained traction.

Can A CAES plant use compressed air to produce electricity?

CAES plants, on the other hand, can potentially use stored compressed air to drive turbines and produce electricity without relying on external grid power. 1.