Today's Outlook - The California ISO

Sudden spikes in resource curve graph may indicate false data briefly reported by system

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Available Resources*: The current forecast of generating and import energy resources available to serve the demand for energy within the California ISO service area. Total Resources is comprised of dependable generation less outages and unavailable OFs, plus the expected imported supply. Available resources is equal to Total Resources less a 3% reserve margin*. (Calculation is detailed below.)

Forecast Demand: Forecast of the demand expected today. This forecast was completed during the previous day's energy market. The procurement of energy resources for the day is based on this forecast.

Actual Demand: Today's actual system demand with historical trend.

Revised Demand Forecast: The current forecast of the system demand expected throughout the remainder of the day. This forecast is updated hourly for the remainder of the day.

	Hour Beginning (MWs)
	12a	1a	2a	3a	4a	5a	6a	7a	8a	9a	10a	11a
	00	01	02	03	04	05	06	07	08	09	10	11
Dependable Generation	46439	46439	46439	46439	46439	46439	46439	46439	46439	46439	46439	46439
- Outages	14877	15944	15944	15944	15944	15944	15944	15944	15944	16023	16023	16023
- QF's Unavailable	0	0	0	0	0	0	0	0	0	0	0	0
+ Imports	2898	2788	2450	2346	2526	2511	3413	3183	3557	3518	3858	3795
Total Resources	34460	33283	32945	32841	33021	33006	33908	33678	34052	33934	34274	34211
Available Resources (less 3% reserve margin)*	33839	32685	32360	32266	32442	32403	33276	33029	33371	33233	33555	33490
Forecast Demand	21022	20096	19769	19542	19497	19949	20780	21920	22808	23385	23754	23829
Actual Demand / Revised Demand Forecast	20696	19932	19478	19140	19299	20067	21061	21622	22681	23360	23958	24011
Surplus/Shortfall	13764	13351	13467	13701	13722	12939	12847	12056	11371	10574	10316	10200
	HourBeginning (MWs)
	12p	1p	2p	3p	4p	5p	6p	7p	8p	9p	10p	11p
	12	13	14	15	16	17	18	19	20	21	22	23
Dependable Generation	46439	46439	46439	46439	46439	46439	46439	46439	46439	46439	46439	46439
- Outages	16023	16023	16023	16023	16023	16023	15976	15976	15976	16217	16217	16217
- QF's Unavailable	0	0	0	0	0	0	0	0	0	0	0	0
+ Imports	3804	3351	3388	3352	3564	4180	4494	4258	4096	4096	4096	4096
Total Resources	34220	33767	33804	33768	33980	34596	34957	34721	34559	34318	34318	34318
Available Resources (less 3% reserve margin)*	33506	33066	33111	33085	33296	33865	34157	33936	33794	33582	33625	33674
Forecast Demand	23660	23412	23128	22870	22901	24492	26834	26336	25518	24530	23127	21507
Actual Demand / Revised Demand Forecast	23769	23364	23077	22744	22771	24357	26663	26162	25499	24502	23090	21442
Surplus/Shortfall	10451	10403	10727	11024	11209	10239	8294	8559	9060	9816	11228	12876

Amounts are recorded at 10 minutes past each hour to reflect values following the hourly ramp. Totals listed for past hours represent actual operational data.

* A 3% reserve ensures the California ISO's ability to respond adequately to an unanticipated emergency. In order to protect the integrity of the Grid, the California ISO may declare a Stage Three Emergency when the system's Operating Reserver is forecast to be at or below 1.5% or less than the largest contingency within the service area (estimated to be 3%)..

Important Legal Notice

The information contained in these web pages is compiled for informational purposes for the convenience of site visitors and is furnished without responsibility for its accuracy.

The information is accepted by the visitor on the condition that errors, omissions and/or changes to the contents shall not be made the basis for any claim, demand or cause for action. Decisions based upon the information contained in these pages are the sole responsibility of the visitor.

The information and data on these web pages is obtained from sources believed to be reliable, but the California Independent System Operator does not guarantee its accuracy.

This part of the California Independent System Operator Home Page is dependent upon system conditions and is subject to change without warning.

Updated: 18-Jan-2003 20:50