how grid energy storage works - battery energy storage system3
Type of power grid energy storage: Pumped Storage Power Station uses water to generate electricity.
You can see this example on Raccoon Hill in Tennessee.
At the foot of the Mountain, Tennessee Valley Authority (TVA)
Drain some of the water on the West River into a lake.
When the customer does not use too much power, TVA transfers the power from other power stations to a power plant on the mountain.
Electricity makes the house's turbines rotate backwards, pushing the lake water to a tunnel on the top of the mountain.
After 28 hours, the basin was full.
For power generation, the TVA opens a drain pipe in the upper basin.
The water goes straight from the center of the mountain, making the turbine rotate forward and generate electricity.
It dropped by 22 hours, steadily exporting 1,600 MW of electricity, matching the production of large coalfired plant.
TVA added this power to the contributions of other plants in the days of [strong demand]source: TVA].
Pumping hydroelectric power stations operate globally and output 200 MW to 2,000 MW of electricity on peak demand days [source: Cole].
They do not emit air pollution, and once charged, they can access the Internet in 15 minutes, faster and greener than the peaker factory.
The only problem is "we don't have a good site anymore," said Gyuk.
Compressed air energy storage (CAES)
Natural storage-
Natural gas power plant
Typically, these plants burn natural gas to heat the air, which pushes the turbine into the generator.
They can use CAES when gas plants are close to underground caves or old mines.
In slow days, the plant can generate electricity to run and compress the external air and push it into the compressor in the underground hole.
In the days when the customer needs the maximum power, the power plant can let the compressed air rush on the turbine together with the normal heated air to push the turbine.
This compressed air can help to steadily increase 25 MW to 2,700 MW on peak demand days for several hours [source: Cole].
Read on to find out where we can also store energy on the Internet.