October 23, 2019

Compressed Air Energy Storage

Listen Later

2 minutes

The increasing use of solar and wind power has created a growing need for technology to store up the energy they generate for use when it is most needed.

Historically, pumped hydropower has provided the largest amount of

storage capacity, but it is limited to only certain geographic locations. Battery energy storage has been growing

rapidly, with the technology becoming better and cheaper over time. But there are various other ways to store

energy that have potential and may well find their place in the changing energy

infrastructure.

One of these is compressed air energy storage, which has been around

for more than a century. It has been

used as a backup method for restarting power plants. But to date, the economic viability of using

it at a large scale has been lacking.

A Canadian startup company called Hydrostor is developing compressed

air energy storage technology that it believes can be used on a utility scale.

The way it works is excess renewable energy is used to run compressors

that compress air. Compressing the air

heats it up and the heat is captured and stored in insulated hot water tanks. The compressed gas is then injected into

underground caverns. When energy is

needed, the compressed air is released, the stored heat is added, and the

warmed gas is run through turbines to generate electricity. Additional features improve the system’s

efficiency.

Hydrostore has built a 1 MW pilot project in Ontario, Canada and is

now commissioning a 2MW system as well.

It is funded to build a 5 MW system in Australia next year and it is bidding

for 300 MW and 500 MW systems in North America.

The company has received equity funding from Baker Hughes, a large

oil-and-gas services and equipment company.

**********

Web Links

Storing energy in compressed air could finally become cheap enough for the big time

Photo courtesy of Hydrostor.

Earth Wise is a production of WAMC Northeast Public Radio.

...more

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Earth Wise

By Randy Simon

4.7

1515 ratings

October 23, 2019

Compressed Air Energy Storage

Listen Later

2 minutes

The increasing use of solar and wind power has created a growing need for technology to store up the energy they generate for use when it is most needed.

Historically, pumped hydropower has provided the largest amount of

storage capacity, but it is limited to only certain geographic locations. Battery energy storage has been growing

rapidly, with the technology becoming better and cheaper over time. But there are various other ways to store

energy that have potential and may well find their place in the changing energy

infrastructure.

One of these is compressed air energy storage, which has been around

for more than a century. It has been

used as a backup method for restarting power plants. But to date, the economic viability of using

it at a large scale has been lacking.

A Canadian startup company called Hydrostor is developing compressed

air energy storage technology that it believes can be used on a utility scale.

The way it works is excess renewable energy is used to run compressors

that compress air. Compressing the air

heats it up and the heat is captured and stored in insulated hot water tanks. The compressed gas is then injected into

underground caverns. When energy is

needed, the compressed air is released, the stored heat is added, and the

warmed gas is run through turbines to generate electricity. Additional features improve the system’s

efficiency.

Hydrostore has built a 1 MW pilot project in Ontario, Canada and is

now commissioning a 2MW system as well.

It is funded to build a 5 MW system in Australia next year and it is bidding

for 300 MW and 500 MW systems in North America.

The company has received equity funding from Baker Hughes, a large

oil-and-gas services and equipment company.

**********

Web Links

Storing energy in compressed air could finally become cheap enough for the big time

Photo courtesy of Hydrostor.

Earth Wise is a production of WAMC Northeast Public Radio.

...more