It's winter, but solar alone met >100% of the @California_ISO grid demand for a few minutes on Sun 1/12/25.
This was the 4th day in 2025 with > 100% WWS
Fossil gas use is down 46%; demand is down 2% this year versus 2024.
This was the 4th day in 2025 with > 100% WWS
Fossil gas use is down 46%; demand is down 2% this year versus 2024.
January 13, 2025 at 8:59 PM
It's winter, but solar alone met >100% of the @California_ISO grid demand for a few minutes on Sun 1/12/25.
This was the 4th day in 2025 with > 100% WWS
Fossil gas use is down 46%; demand is down 2% this year versus 2024.
This was the 4th day in 2025 with > 100% WWS
Fossil gas use is down 46%; demand is down 2% this year versus 2024.
@California_ISO dispatch from yesterday. This is how you have a reliable grid through the energy transition in the presence of climate change fueled extremes. Solar cranking. Batteries time shifting. Deep cooperation with your neighbors.
September 6, 2024 at 5:29 PM
@California_ISO dispatch from yesterday. This is how you have a reliable grid through the energy transition in the presence of climate change fueled extremes. Solar cranking. Batteries time shifting. Deep cooperation with your neighbors.
CA solar is almost as reliable as coal:
2025 avg capacity factor of all 21.58 GW* of solar on the @California_ISO grid:
30.2%
2024 CF US coal:
42.6%
www.eia.gov/electricity/...
->Coal not much more reliable than CA solar
*=avg Dec '24 & Dec '25 nameplates
Solar output: 57,054 GWh/y
2025 avg capacity factor of all 21.58 GW* of solar on the @California_ISO grid:
30.2%
2024 CF US coal:
42.6%
www.eia.gov/electricity/...
->Coal not much more reliable than CA solar
*=avg Dec '24 & Dec '25 nameplates
Solar output: 57,054 GWh/y
Electric Power Monthly - U.S. Energy Information Administration (EIA)
www.eia.gov
February 9, 2026 at 9:32 PM
CA solar is almost as reliable as coal:
2025 avg capacity factor of all 21.58 GW* of solar on the @California_ISO grid:
30.2%
2024 CF US coal:
42.6%
www.eia.gov/electricity/...
->Coal not much more reliable than CA solar
*=avg Dec '24 & Dec '25 nameplates
Solar output: 57,054 GWh/y
2025 avg capacity factor of all 21.58 GW* of solar on the @California_ISO grid:
30.2%
2024 CF US coal:
42.6%
www.eia.gov/electricity/...
->Coal not much more reliable than CA solar
*=avg Dec '24 & Dec '25 nameplates
Solar output: 57,054 GWh/y
New battery record on the @California_ISO grid
Fri 8/1, 10.935 GW peak discharge rate
169 of 215 days in 2025 with >100% WWS
Gas down 26% v '24 & 44% v '23
Solar up 19% v '24 & 48% v '23
Batteries up 63% v '24 & 214% v '23
Demand down 2% v '24 & 2.3% v '23
WWS has met 57.7% of demand in '25
Fri 8/1, 10.935 GW peak discharge rate
169 of 215 days in 2025 with >100% WWS
Gas down 26% v '24 & 44% v '23
Solar up 19% v '24 & 48% v '23
Batteries up 63% v '24 & 214% v '23
Demand down 2% v '24 & 2.3% v '23
WWS has met 57.7% of demand in '25
August 5, 2025 at 4:15 AM
New battery record on the @California_ISO grid
Fri 8/1, 10.935 GW peak discharge rate
169 of 215 days in 2025 with >100% WWS
Gas down 26% v '24 & 44% v '23
Solar up 19% v '24 & 48% v '23
Batteries up 63% v '24 & 214% v '23
Demand down 2% v '24 & 2.3% v '23
WWS has met 57.7% of demand in '25
Fri 8/1, 10.935 GW peak discharge rate
169 of 215 days in 2025 with >100% WWS
Gas down 26% v '24 & 44% v '23
Solar up 19% v '24 & 48% v '23
Batteries up 63% v '24 & 214% v '23
Demand down 2% v '24 & 2.3% v '23
WWS has met 57.7% of demand in '25
0.2% less demand to date on @California_ISO grid in 2025 v '23 & '24
39% less gas v '23 & 20% less v '24
214% more battery output v '23 & 64% more v '24
47.4% more solar v '23 & 17.3% more v '24
57.2% of demand in '25 met by WWS
4.8 h/day >100% WWS in '25
151 days '25 >100% WWS
39% less gas v '23 & 20% less v '24
214% more battery output v '23 & 64% more v '24
47.4% more solar v '23 & 17.3% more v '24
57.2% of demand in '25 met by WWS
4.8 h/day >100% WWS in '25
151 days '25 >100% WWS
July 13, 2025 at 3:47 PM
0.2% less demand to date on @California_ISO grid in 2025 v '23 & '24
39% less gas v '23 & 20% less v '24
214% more battery output v '23 & 64% more v '24
47.4% more solar v '23 & 17.3% more v '24
57.2% of demand in '25 met by WWS
4.8 h/day >100% WWS in '25
151 days '25 >100% WWS
39% less gas v '23 & 20% less v '24
214% more battery output v '23 & 64% more v '24
47.4% more solar v '23 & 17.3% more v '24
57.2% of demand in '25 met by WWS
4.8 h/day >100% WWS in '25
151 days '25 >100% WWS
Calif now has 1.3 mil EVs (100,000 added Q1 '25) plus 316 data centers
Yet @California_ISO demand is down 1% v '24 & '23.
Due mostly to behind-the-meter PV
Gas down 22% v '24 & 41% v '23
Utility PV up 18% v '24 & 47% v '23
Batteries up 64% v '24 & 214% v '23
157 of 202 days in '25 w/>100% WWS
Yet @California_ISO demand is down 1% v '24 & '23.
Due mostly to behind-the-meter PV
Gas down 22% v '24 & 41% v '23
Utility PV up 18% v '24 & 47% v '23
Batteries up 64% v '24 & 214% v '23
157 of 202 days in '25 w/>100% WWS
July 22, 2025 at 4:40 PM
Calif now has 1.3 mil EVs (100,000 added Q1 '25) plus 316 data centers
Yet @California_ISO demand is down 1% v '24 & '23.
Due mostly to behind-the-meter PV
Gas down 22% v '24 & 41% v '23
Utility PV up 18% v '24 & 47% v '23
Batteries up 64% v '24 & 214% v '23
157 of 202 days in '25 w/>100% WWS
Yet @California_ISO demand is down 1% v '24 & '23.
Due mostly to behind-the-meter PV
Gas down 22% v '24 & 41% v '23
Utility PV up 18% v '24 & 47% v '23
Batteries up 64% v '24 & 214% v '23
157 of 202 days in '25 w/>100% WWS
187th day of the year that WindWaterSolar powered the @California_ISO grid for part of the day.
Gas down 37% v '23 & 17.3% v '24
Solar up 45% v '23 & 15.2% v '24
Batteries up 206% v '23 & 59% v '24
Demand down 1.1% v '23 & 1.4% v '24 despite more AI
Gas down 37% v '23 & 17.3% v '24
Solar up 45% v '23 & 15.2% v '24
Batteries up 206% v '23 & 59% v '24
Demand down 1.1% v '23 & 1.4% v '24 despite more AI
September 29, 2025 at 4:29 PM
187th day of the year that WindWaterSolar powered the @California_ISO grid for part of the day.
Gas down 37% v '23 & 17.3% v '24
Solar up 45% v '23 & 15.2% v '24
Batteries up 206% v '23 & 59% v '24
Demand down 1.1% v '23 & 1.4% v '24 despite more AI
Gas down 37% v '23 & 17.3% v '24
Solar up 45% v '23 & 15.2% v '24
Batteries up 206% v '23 & 59% v '24
Demand down 1.1% v '23 & 1.4% v '24 despite more AI
FYI: Battery storage connected to California's grid (@California_ISO) is now over 13% of peak demand in (7 GW vs 52 GW peak). And they added 1 GW in November & December 2023 alone. This happened fast!
Source: twitter.com/jdeely/statu...
Source: twitter.com/jdeely/statu...
January 9, 2024 at 9:17 PM
FYI: Battery storage connected to California's grid (@California_ISO) is now over 13% of peak demand in (7 GW vs 52 GW peak). And they added 1 GW in November & December 2023 alone. This happened fast!
Source: twitter.com/jdeely/statu...
Source: twitter.com/jdeely/statu...
Yet from 2023 to 2026, the @California_ISO grid replaced 61% of its fossil gas with in-state WindWaterSolar and imports (which are 57% WWS+12% nuclear). That alone has now eliminated 38 million tonnes-CO2e/year, or twice the current world CC/DAC net capture rate from 77 facilities.
Global Status of CCS
Discover key insights from the Global Status of CCS 2025 report — tracking global CCS progress, policy growth, investments, and project expansion.
globalccsinstitute.com
June 18, 2026 at 8:33 PM
Yet from 2023 to 2026, the @California_ISO grid replaced 61% of its fossil gas with in-state WindWaterSolar and imports (which are 57% WWS+12% nuclear). That alone has now eliminated 38 million tonnes-CO2e/year, or twice the current world CC/DAC net capture rate from 77 facilities.
11 straight days and 52 of 84 on the @California_ISO grid with >100% Wind-Water-Solar
Gas down 26% v '24 and 41% v '23
Solar up 25% v '24 and 54% v '23
Batteries up 75% v '24 and 198% v '23
24-h WWS up 10% v '24 and 18% v '23
WWS supplying 46.5% of 24-h demand '25 v 42.5% in '24 and 38.1% in '23
Gas down 26% v '24 and 41% v '23
Solar up 25% v '24 and 54% v '23
Batteries up 75% v '24 and 198% v '23
24-h WWS up 10% v '24 and 18% v '23
WWS supplying 46.5% of 24-h demand '25 v 42.5% in '24 and 38.1% in '23
March 26, 2025 at 3:18 PM
11 straight days and 52 of 84 on the @California_ISO grid with >100% Wind-Water-Solar
Gas down 26% v '24 and 41% v '23
Solar up 25% v '24 and 54% v '23
Batteries up 75% v '24 and 198% v '23
24-h WWS up 10% v '24 and 18% v '23
WWS supplying 46.5% of 24-h demand '25 v 42.5% in '24 and 38.1% in '23
Gas down 26% v '24 and 41% v '23
Solar up 25% v '24 and 54% v '23
Batteries up 75% v '24 and 198% v '23
24-h WWS up 10% v '24 and 18% v '23
WWS supplying 46.5% of 24-h demand '25 v 42.5% in '24 and 38.1% in '23
Remarkable
Half (28 of 56 days) of 2025 & 12 days in a row have been >100% #WindWaterSolar for part of each day on the @California_ISO
Solar is up 33.5%, wind is up 11.4%, WWS is up 16.8% in '25 v '24
Gas is down 28.4% v '24 and down 33.7% v '23
Battery output is up 79.7% v '24 and 194% v '23
Half (28 of 56 days) of 2025 & 12 days in a row have been >100% #WindWaterSolar for part of each day on the @California_ISO
Solar is up 33.5%, wind is up 11.4%, WWS is up 16.8% in '25 v '24
Gas is down 28.4% v '24 and down 33.7% v '23
Battery output is up 79.7% v '24 and 194% v '23
February 26, 2025 at 3:47 PM
Remarkable
Half (28 of 56 days) of 2025 & 12 days in a row have been >100% #WindWaterSolar for part of each day on the @California_ISO
Solar is up 33.5%, wind is up 11.4%, WWS is up 16.8% in '25 v '24
Gas is down 28.4% v '24 and down 33.7% v '23
Battery output is up 79.7% v '24 and 194% v '23
Half (28 of 56 days) of 2025 & 12 days in a row have been >100% #WindWaterSolar for part of each day on the @California_ISO
Solar is up 33.5%, wind is up 11.4%, WWS is up 16.8% in '25 v '24
Gas is down 28.4% v '24 and down 33.7% v '23
Battery output is up 79.7% v '24 and 194% v '23
@California_ISO has come out with their December Key Statistics report - which officially shows over 7GW of battery storage.
www.caiso.com/Documents/Ke...
www.caiso.com/Documents/Ke...
January 13, 2024 at 8:42 PM
@California_ISO has come out with their December Key Statistics report - which officially shows over 7GW of battery storage.
www.caiso.com/Documents/Ke...
www.caiso.com/Documents/Ke...
After adding over 1GW of storage in Nov/Dec
@California_ISO now has over 7GW of energy storage.
Note: almost all of the storage on the grid has a duration of 4 hours.
@California_ISO now has over 7GW of energy storage.
Note: almost all of the storage on the grid has a duration of 4 hours.
January 9, 2024 at 4:32 PM
After adding over 1GW of storage in Nov/Dec
@California_ISO now has over 7GW of energy storage.
Note: almost all of the storage on the grid has a duration of 4 hours.
@California_ISO now has over 7GW of energy storage.
Note: almost all of the storage on the grid has a duration of 4 hours.
Last night on the CAISO grid: Batteries were the largest source of supply.
Charge off-peak. Discharge peak. #HowItsDone
Charge off-peak. Discharge peak. #HowItsDone
April 17, 2024 at 3:16 PM
Last night on the CAISO grid: Batteries were the largest source of supply.
Charge off-peak. Discharge peak. #HowItsDone
Charge off-peak. Discharge peak. #HowItsDone
Important: Who will run Western electricity markets?
@California_ISO
or
@SPPorg? It matters for
@bonnevillepower
@portlandgeneral
@PSETalk
@SRPconnect
@PacifiCorp
https://www.rtoinsider.com/52145-markets-gathers-momentum-skeptics/
@California_ISO
or
@SPPorg? It matters for
@bonnevillepower
@portlandgeneral
@PSETalk
@SRPconnect
@PacifiCorp
https://www.rtoinsider.com/52145-markets-gathers-momentum-skeptics/
In Contest for the West, Markets+ Gathers Momentum — and Skeptics
While some stakeholders are "charmed" by SPP’s market initiative effort, Markets+, others urge the need for deeper ties to CAISO.
www.rtoinsider.com
August 6, 2023 at 7:58 PM
Important: Who will run Western electricity markets?
@California_ISO
or
@SPPorg? It matters for
@bonnevillepower
@portlandgeneral
@PSETalk
@SRPconnect
@PacifiCorp
https://www.rtoinsider.com/52145-markets-gathers-momentum-skeptics/
@California_ISO
or
@SPPorg? It matters for
@bonnevillepower
@portlandgeneral
@PSETalk
@SRPconnect
@PacifiCorp
https://www.rtoinsider.com/52145-markets-gathers-momentum-skeptics/
#Energytwitter ... how come @California_ISO issues a Stage 2 emergency alert, demand is near the peak, yet real-time prices are just $80??
November 22, 2024 at 1:22 PM
#Energytwitter ... how come @California_ISO issues a Stage 2 emergency alert, demand is near the peak, yet real-time prices are just $80??
#energytwitter now we see $50 @California_ISO power while wrapping up a 240k household blackout in PGE. That doesn’t sound right.
November 22, 2024 at 1:22 PM
#energytwitter now we see $50 @California_ISO power while wrapping up a 240k household blackout in PGE. That doesn’t sound right.
Hey, @California_ISO, you may want to update your SSL when this week is over with.
November 22, 2024 at 1:22 PM
Hey, @California_ISO, you may want to update your SSL when this week is over with.
Load flexibility is the key to a clean energy future! Insights from the @California_ISO Symposium: scaling virtual power plants, smarter devices, & demand response will transform the grid. Collaboration, standardization, & equity are essential.⚡ #CAISO #CleanEnergy
CAISO Symposium 2024 Panel 4: The Next Frontier for Load Flexibility
buff.ly
December 5, 2024 at 4:55 PM
Load flexibility is the key to a clean energy future! Insights from the @California_ISO Symposium: scaling virtual power plants, smarter devices, & demand response will transform the grid. Collaboration, standardization, & equity are essential.⚡ #CAISO #CleanEnergy
So many people are checking on the state of the grid that the @California_ISO website crashed #blackouts
November 17, 2024 at 11:34 PM
So many people are checking on the state of the grid that the @California_ISO website crashed #blackouts
So many people are checking on the state of the grid that the @California_ISO website crashed #blackouts
November 17, 2024 at 8:40 PM
So many people are checking on the state of the grid that the @California_ISO website crashed #blackouts
@robbnri @California_ISO Yeah! The only possible time to charge my government-mandated electric car is 4pm-9pm on a weekday! That's how the world works!
November 26, 2024 at 8:34 PM
@robbnri @California_ISO Yeah! The only possible time to charge my government-mandated electric car is 4pm-9pm on a weekday! That's how the world works!
Developing and modernising electricity grids is a vital enabler of the clean energy transition.
Join us on 16 May with @nationalgrid and guest speakers from @Pembina & @California_ISO to discuss the shift from #coaltoclean.
👉Read more on the event here...
Join us on 16 May with @nationalgrid and guest speakers from @Pembina & @California_ISO to discuss the shift from #coaltoclean.
👉Read more on the event here...
January 15, 2025 at 5:09 PM
Developing and modernising electricity grids is a vital enabler of the clean energy transition.
Join us on 16 May with @nationalgrid and guest speakers from @Pembina & @California_ISO to discuss the shift from #coaltoclean.
👉Read more on the event here...
Join us on 16 May with @nationalgrid and guest speakers from @Pembina & @California_ISO to discuss the shift from #coaltoclean.
👉Read more on the event here...
Today's webinar is all about modernising electricity grids to enable the #cleanenergy transition 🔌💡
Don't miss out on this insightful discussion with experts from the @nationalgrid @pembina @California_ISO - starting in 15 minutes!
Register here 👉...
Don't miss out on this insightful discussion with experts from the @nationalgrid @pembina @California_ISO - starting in 15 minutes!
Register here 👉...
January 15, 2025 at 5:09 PM
Today's webinar is all about modernising electricity grids to enable the #cleanenergy transition 🔌💡
Don't miss out on this insightful discussion with experts from the @nationalgrid @pembina @California_ISO - starting in 15 minutes!
Register here 👉...
Don't miss out on this insightful discussion with experts from the @nationalgrid @pembina @California_ISO - starting in 15 minutes!
Register here 👉...
California ISO Chooses LS Power for Major Transmission Project in Bay Area#United_States#California#Bay_Area#LS_Power#California_ISO
California ISO Chooses LS Power for Major Transmission Project in Bay Area
The California ISO has selected LS Power Grid California for a new underground transmission line project, enhancing Bay Area's electric grid reliability and infrastructure.
third-news.com
April 20, 2026 at 1:31 PM
California ISO Chooses LS Power for Major Transmission Project in Bay Area#United_States#California#Bay_Area#LS_Power#California_ISO