CAISO battery dispatch history

See how California's batteries charge and discharge, their evening output, and estimated energy from five-minute observations. Choose a date to inspect the daily record and compare complete 30-day periods.

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Battery charging and discharging

Through Oct 21, 2026

Observed peak discharge

3,676 MW

Oct 21, 2026 · 288/288 five-minute samples

Observed peak charging

4,692 MW

Magnitude of charging from the grid

Evening peak discharge

3,676 MW

4–9 p.m. Pacific, observed samples

Daily peak battery discharge

Complete Pacific calendar days · CAISO · MW

Estimated discharge energy, comparable 30-day periods

Latest 30 days

1,354,292.42 MWh

Sep 22, 2026 – Oct 21, 2026 · 30/30 complete days

Preceding 30 days

1,375,062.08 MWh

Aug 23, 2026 – Sep 21, 2026 · 30/30 complete days

Change from preceding period

-1.51%

Two adjacent 30-day calendar windows

CAISO daily battery dispatch and observed-sample energy estimates, Pacific calendar dates
Date	Peak discharge (MW)	Evening peak (MW)	Estimated discharge (MWh)	Estimated charging (MWh)	Samples / expected
Oct 21, 2026	3,676	3,676	19,153.83	26,126.17	288 / 288
Oct 20, 2026	9,488	9,488	48,823.5	51,839.75	288 / 288
Oct 19, 2026	9,463	9,463	54,619.42	54,175.92	288 / 288
Oct 18, 2026	8,187	8,187	44,952.33	56,226.33	288 / 288
Oct 17, 2026	7,303	7,303	41,248.25	52,134.92	288 / 288
Oct 16, 2026	9,282	9,282	50,648.92	53,806.08	288 / 288
Oct 15, 2026	7,667	7,667	44,296.42	60,039.5	288 / 288
Oct 14, 2026	9,714	9,714	50,699.58	57,963.42	288 / 288
Oct 13, 2026	10,447	10,447	56,375.5	61,797	288 / 288
Oct 12, 2026	7,954	7,954	53,793.08	49,495.67	288 / 288
Oct 11, 2026	6,789	6,789	40,652.25	52,827.83	288 / 288
Oct 10, 2026	4,566	4,566	24,826.17	38,049.33	288 / 288
Oct 9, 2026	10,061	10,061	48,631.83	55,562.33	288 / 288
Oct 8, 2026	10,305	10,305	52,937.08	60,135.17	288 / 288
Oct 7, 2026	9,886	9,886	52,670	57,839.42	288 / 288
Oct 6, 2026	9,974	9,974	50,180.92	57,731	288 / 288
	12,125	12,125	47,578.08	58,848.42	288 / 288
	11,107	11,107	48,671.17	56,772.67	288 / 288
	10,567	10,567	49,346.25	55,527.17	288 / 288
	10,501	10,501	46,617	55,376.75	288 / 288
	10,584	10,584	48,774.92	57,866.17	288 / 288
	9,586	9,586	48,485.67	48,930.83	288 / 288
	8,250	8,250	46,816.58	53,331.33	288 / 288
	6,480	6,480	32,775.08	49,825.83	288 / 288
	5,843	5,843	25,130.33	30,489.25	288 / 288
	9,697	9,697	51,231.25	52,173.75	288 / 288
	9,687	9,687	43,912.58	54,564.92	288 / 288
	7,201	7,201	33,787.17	43,912.17	288 / 288
	10,006	10,006	50,087.92	51,297.75	288 / 288
	8,837	8,837	46,569.33	54,558.83	288 / 288
	8,126	8,126	41,873.17	53,069.67	288 / 288
	7,929	7,929	43,302.92	50,975.75	288 / 288
	8,464	8,464	50,079.33	53,042.58	288 / 288
	8,711	8,711	45,488.25	52,422.25	288 / 288
	9,334	9,334	49,384.67	55,925.83	288 / 288
	8,680	8,680	50,039	54,789	288 / 288
	9,486	9,486	43,499.42	59,182.83	288 / 288
	10,374	10,374	51,484.33	54,646.58	288 / 288
	10,014	10,014	47,794.92	59,078.67	288 / 288
	10,024	10,024	47,540.17	53,997.33	288 / 288
	10,747	10,747	50,972.5	48,814.58	288 / 288
	9,626	9,626	39,724.17	52,414	288 / 288
	10,679	10,679	44,500	56,837.25	288 / 288
	11,394	11,394	45,425.5	53,968.08	288 / 288
	8,590	8,590	41,546.33	47,516.83	288 / 288
	6,344	6,344	32,570	36,758.33	288 / 288
	9,040	9,040	46,157.83	54,587.33	288 / 288
	9,847	9,847	46,765.58	59,251.67	288 / 288
	10,756	10,756	52,667.5	54,536.67	288 / 288
	10,070	10,070	51,427.25	57,878.42	288 / 288
	10,617	10,617	52,543.75	57,449	288 / 288
	9,711	9,711	44,485.58	58,916.5	288 / 288
	11,384	11,384	50,150.83	54,673	288 / 288
	8,902	8,902	38,958.17	47,920.42	288 / 288
	8,191	8,191	38,767.92	53,984.75	288 / 288
	7,581	7,581	34,490.5	41,817.33	288 / 288
	11,422	11,422	41,766.25	48,163.17	288 / 288
	11,512	11,512	47,535	56,074.75	288 / 288
	12,109	12,109	49,135.42	59,295	288 / 288
	12,406	12,406	54,985.83	57,008.5	288 / 288
	10,449	10,449	46,358.08	59,827.08	288 / 288
	10,999	10,999	48,009	59,972.33	288 / 288
	11,751	11,751	48,333.25	51,504.92	288 / 288
	13,306	13,306	49,439.25	57,112.42	288 / 288
	13,441	13,441	51,199.58	56,822.42	288 / 288
	13,074	13,074	53,723.5	57,487.58	288 / 288
	11,585	11,585	49,295	60,430.92	288 / 288
	11,615	11,615	57,707.83	57,283.92	288 / 288
	9,768	9,768	50,205.58	53,378.75	288 / 288
	8,907	8,907	38,110.75	53,257.5	288 / 288
	10,377	10,377	43,698.25	59,369.83	288 / 288
	10,758	10,758	42,524.75	49,975.17	288 / 288
	11,103	11,103	44,173.67	56,364.08	288 / 288
	11,591	11,591	47,368.08	53,644.83	288 / 288
	11,785	11,785	50,287.5	58,414.83	288 / 288
	11,740	11,740	47,235.75	55,325.25	288 / 288
	12,078	12,078	49,401.17	53,759.5	288 / 288
	12,212	12,212	55,130.5	60,584.08	288 / 288
	10,836	10,836	47,291.25	58,826.08	288 / 288
	12,589	12,589	51,572.25	59,604.25	288 / 288
	12,127	12,127	53,401.42	59,132.92	288 / 288
	13,096	13,096	48,270.42	59,162.17	288 / 288
	12,622	12,622	51,783.33	56,612.92	288 / 288
	12,890	12,890	54,798.42	58,579.33	288 / 288
	11,336	11,336	49,378.75	51,025.5	288 / 288
	10,092	10,092	38,804.25	54,411	288 / 288
	11,466	11,466	46,233.25	58,393.33	288 / 288
	12,206	12,206	52,377.42	56,043.75	288 / 288
	11,230	11,230	45,115.92	58,354.5	288 / 288
	9,446	9,446	41,521.5	45,997.25	288 / 288

Energy estimates sum the observed five-minute net-power samples × 1/12 hour, separately for charging and discharging. Partial days show only observed energy. Complete-day comparisons account for Pacific daylight saving time. Net fleet output includes standalone and hybrid batteries.

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About this view

Charging and discharging

CAISO publishes the fleet's net power in MW. Positive readings mean discharge into the grid and negative readings mean charging. Standalone and hybrid batteries are already included in the fleet total.

Energy and coverage

Daily energy is estimated by multiplying each observed five-minute power sample by five minutes. Missing samples remain gaps. Complete days account for California's 23-hour and 25-hour daylight-saving changes.

Historical comparisons

The 30-day comparison uses two adjacent calendar windows ending on the chosen date. A change is shown only when both windows contain every expected sample. Evening output is the highest observed discharge between 4 p.m. and 9 p.m. Pacific.

Questions

What does a negative battery reading mean?

The fleet is charging from the grid. Charging and discharging energy estimates are shown separately; netting them would hide both activities.

How is daily energy estimated?

Each observed five-minute net-power sample contributes MW divided by 12 to the relevant charging or discharging MWh estimate. The table reports how many expected samples are present.

Does evening output measure avoided blackouts?

It measures observed battery discharge during the 4–9 p.m. Pacific window. Reliability benefits and avoided costs require additional analysis of system conditions.

viewCAISO emergency alertsRead CAISO's operating notices and declared conditions.catalogBattery Storage Net OutputThe underlying table, its schema, and its history.

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Battery charging and discharging

Estimated discharge energy, comparable 30-day periods

About this view

Charging and discharging

Energy and coverage

Historical comparisons

Questions

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More CAISO views

Sources

Battery charging and discharging

Estimated discharge energy, comparable 30-day periods