how grid energy storage works - battery energy storage system1
"Energy storage is not cheap in terms of actual costs," Imre Gyuk said . ".
We can see the cost situation today, but the cost will drop as more storage enters the grid.
Let's start with the storage of the power plant.
As we learned earlier, a power company may store energy in a power plant, which is highdemand days.
The plant needs big power for a whole day, and power can only be provided with compressed air and pumped hydropower.
The company buys a compressed air system for every $700 to get 1 KW of the electricity, and the supply time is more than 20 hours, enough to run a coffee machine all day [
Source: EAC, NSTAR].
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$2,250 per kilowatt.
For electricity that lasts minutes to hours, lithium-
$1,100 per kilowatt (Or coffee machine)
, The cost of the flywheel per kilowatt is $1,250, the cost of the mobile battery per kilowatt is $2,500, high
Temperature batteries like sodium
Sulfur $3,100 per kilowattsource: EAC].
The storage cost of the super capacitor is higher.
But, according to Gyuk, we have a lot of investment in storage.
We get a grid that can handle more wind and solar power plants without a supply nightmare.
We have fewer peaker factories, which means less carbon dioxide emissions and less air pollution.
We are protected against power outages, and according to Gyuk, we spend 33 cents per dollar on [electricity]
Source: Gyuk 2008].
If the power company and ISOs decide to install the storage device, they will pay for the storage.
"The price of storage is falling.
The cost of solving the problem in other ways is rising.
"Soon, these prices will cross, which suggests that costs may stimulate the grid to increase storage space," Boyes notes . ".
Will the end consumer's electricity bill fall? Maybe.
With enough storage space, utilities will be able to generate electricity in a more manageable way.
It is better for them to use the hardware in the grid, such as transmission lines and substations, instead of replacing or expanding them.
Even if the consumer's electricity bill goes up, "we will get a better system," Gyuk said . ".