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Grid Storage News

ItsNotAboutTheMoney

Well-Known Member
Jul 12, 2012
12,175
10,559
Maine
OK, I'm going to start a thread for this because ...

Electric Power Monthly - December 2019 for October 2019.

Batteries

Capacity (MW):
PeriodPriorChangeNewChange
Month1,003.03.31,006.30.33%
YTD852.1154.21,006.318.10%
Rolling768.9237.41,006.330.88%
Plan +12mo93.550.0140.2.

Reported utility-scale battery capacity is creeping up and passed 1GW last month. 1GW deserves recognition.
An additional 50MW has been reported for the next 12 months, bringing the total to 140.2MW.

Obviously this ignores the retail or homebrew small-scale batteries that are being deployed.

For comparison of how small scale this is currently:

Hydroelectric Pumped Storage:

Capacity (MW):

PeriodPriorChangeNewChange
Month22,909.20.022,909.20.00%
YTD22,830.279.022,909.20.35%
Rolling22,830.279.022,909.20.35%
Plan +12mo191.60.0191.6.

Note that pumped storage also stores a lot more energy.
 
Last edited:
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nwdiver

Well-Known Member
Feb 17, 2013
8,986
13,308
United States
OK, I'm going to start a thread for this because ...

Electric Power Monthly - December 2019 for October 2019.

Batteries

Capacity (MW):
PeriodPriorChangeNewChange
Month1,003.03.31,006.30.33%
YTD852.1154.21,006.318.10%
Rolling768.9237.41,006.330.88%
Plan +12mo93.550.0140.2.

Reported utility-scale battery capacity is creeping up and passed 1GW last month. 1GW deserves recognition.
An additional 50MW has been reported for the next 12 months, bringing the total to 140.2MW.

Obviously this ignores the retail or homebrew small-scale batteries that are being deployed.

For comparison of how small scale this is currently:

Hydroelectric Pumped Storage:

Capacity (MW):

PeriodPriorChangeNewChange
Month22,909.20.022,909.20.00%
YTD22,830.279.022,909.20.35%
Rolling22,830.279.022,909.20.35%
Plan +12mo191.60.0191.6.

Note that pumped storage also stores a lot more energy.

Do you mean MWh? Not trying to be pedantic... I saw a storage report recently that actually WAS MW...
 

ItsNotAboutTheMoney

Well-Known Member
Jul 12, 2012
12,175
10,559
Maine
Do you mean MWh? Not trying to be pedantic... I saw a storage report recently that actually WAS MW...

This is capacity, as reported in the Summer Capacity section of the EIA's Electric Power Monthly.

Since, unlike pumped storage, batteries are not (yet) reported in the generation statistics (whereas pumped hydro is reported as negative generation), the best we could probably do would be to back-calculate from the "Usage Factors for Utility Scale Storage".

For usage factors and capacity they only include whole-month values. It seems that the batteries that are deployed aren't being used as much.

Batteries:

Usage Factor (MW):

ValuePriorChangeNewChange
Month Capacity748.9254.11,003.033.93%
Month Factor5.0%-1.6%3.4%-32.00%
Rolling 12mo Factor5.5%-1.1%4.3%-20.95%

Pumped Storage:

Usage Factor (MW):

ValuePriorChangeNewChange
Month Capacity22,830.279.022,909.20.35%
Month Factor9.4%-1.2%8.2%-12.77%
Rolling 12mo Factor10.9%-0.5%10.4%-4.43%

For Capacity Factors, the technical note says that it's:
sum(generation) / sum(capacity x time)
over generators and time periods.

For October 2019 batteries, assuming Usage Factor is the storage equivalent, and reported as negative generation as per Pumped Storage:

-1,003.0 MW x 31d x 24 h/d x 3.4%
= -25371.888MWh
= -25.4GWh

Pumped Storage was -373GWh in October 2019.
 
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SageBrush

REJECT Fascism
May 7, 2015
13,576
18,587
New Mexico
I routinely come across this problem of watt Vs watt*hour reporting of battery, and I don't mean simple errors in units.
I was at my local electric utility's presentation about energy storage a few weeks ago and they used power units. I suppose it makes sense for them since the primary use is load shaving and FACS.

It is typical (but by no means a given) that 4 hours of the power rating = the capacity.
 

miimura

Well-Known Member
Aug 21, 2013
7,383
7,382
Los Altos, CA
I routinely come across this problem of watt Vs watt*hour reporting of battery, and I don't mean simple errors in units.
I was at my local electric utility's presentation about energy storage a few weeks ago and they used power units. I suppose it makes sense for them since the primary use is load shaving and FACS.

It is typical (but by no means a given) that 4 hours of the power rating = the capacity.
Tesla sells 2 hour and 4 hour systems for commercial batteries.
 
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ItsNotAboutTheMoney

Well-Known Member
Jul 12, 2012
12,175
10,559
Maine
Electric Power Monthly - January 2020 for November 2019.

Batteries added a whopping 6.3MW of capacity.
Planned 12 month capacity increased 5.8MW to 139.7MW.

Capacity (MW):
PeriodPriorChangeNewChange
Month1,006.36.31,012.60.63%
YTD852.1160.51,012.618.84%
Rolling770.7241.91,012.631.39%
Plan +12mo140.25.8139.7.

Usage Factor (MW):
ValuePriorChangeNewChange
Month Capacity768.9238.71,007.631.04%
Month Factor5.3%-1.6%3.7%-30.19%
Rolling 12mo Factor5.3%-1.2%4.2%-21.60%
 

ItsNotAboutTheMoney

Well-Known Member
Jul 12, 2012
12,175
10,559
Maine
Electric Power Monthly - March 2020 for January 2020.

Grid batteries added 8.1MW of capacity.
Planned 12 month additional capacity increased 149.8MW to 528.6MW.

Capacity (MW):
PeriodPriorChangeNewChange
Month1,015.28.11,023.30.80%
YTD1,015.28.11,023.30.80%
Rolling873.6149.71,023.317.14%
Plan +12mo386.9149.8528.6.
 

mspohr

Well-Known Member
Jul 27, 2014
11,507
14,971
California
Lithium-ion storage is here to stay with no ‘post Li-ion’ era in sight

A German-Israeli research group has gathered to discuss which storage technologies may outperform lithium-ion batteries in the future. They concluded that there is no such a thing as a “post Li‐ion” era in sight. They recommended a “side‐by‐side” approach for multiple technologies in different applications, as well as the hybridization of technologies.
 
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21miDay

Member
Supporting Member
May 26, 2014
222
145
Phoenix

ItsNotAboutTheMoney

Well-Known Member
Jul 12, 2012
12,175
10,559
Maine
Is there an estimate from EPRI or another organization of how much storage would be needed for the grid as it is converted to renewables? The amount of generation that is currently gas, coal and nuclear is quite high. EIA has graphs that show the generation by energy sources. United States - U.S. Energy Information Administration (EIA) - Real-time Operating Grid Scroll down to find the one that I am referring to.

If you use 750,000MW generation as peak and assumed the pessimistic scenario that storage would have to provide all the power during the peak (which it wouldn't), and that batteries were 0.25C, then you'd need 3,000,000MWh (3TWh) of batteries to be able to meet all of that peak demand.

That might seem like a big number, but that's the equivalent of 60,000,000 50kWh batteries.

The USA has about 253 million light vehicles. So, if we can heavily electrify transportation, meeting peak demand with battery storage would be an easy task in comparison.
 

ItsNotAboutTheMoney

Well-Known Member
Jul 12, 2012
12,175
10,559
Maine


100MWh and 100MW storage system at the Drax power station. Drax is a 3.9GW power plant so there's potential to add plenty more battery capacity in the area.
 
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Battery systems on the U.S. power grid are increasingly used to respond to price


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Highlights from the article:

...the capacity of utility-scale battery storage more than tripled in the United States during 2021, from 1.4 gigawatts (GW) at the end of 2020 to 4.6 GW
...During 2021, 59% of the 4.6 GW of utility-scale U.S. battery capacity was used for price arbitrage, up from 17% in 2019. In certain markets, price arbitrage is more common than in others. For example, more than 80% of the battery capacity added in 2021 in the California Independent System Operator service territory was used for price arbitrage.
...more than 93% of the battery capacity that came online in 2021 was co-located with solar power plants

Battery systems on the U.S. power grid are increasingly used to respond to price
 
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