Market Performance Report for December 2006
pdf 691K
Summary:
To facilitate dissemination of market information in a timely manner, the California ISO will be posting on a planned and scheduled monthly basis the Market Performance Report for the previous month. The intention is to publish the report mid-month for the previous month's market information. This Market Performance Report will be similar to the information provided to the Board and market, however available on a more consistently timed basis.
Extract:
Highlights for December 2006:
The average load in December was 26,229 MW, approximately 2.8 percent above Novembers average load of 25,507 MW.
Natural gas prices declined steadily during December from $7.50/MMBtu to under $6.00/MMBtu by month's end.
Bilateral electricity prices also declined consistent with the fall in gas prices.
Average real-time energy price increased slightly over the prior month from $49.25/MWh to $50.79/MWh. Average volumes of incremental and decremental energy remained relatively unchanged.
The volume of scheduled outages declined by about half during the month as the volume of Must-Offer-Waivers-Allowed increased accordingly.
Consistent with the increase in on-line capacity, the frequency of five-minute interval prices exceeding $250 declined from 88 in November to 59 in December.
Out-of-Sequence re-dispatch volumes increased by 60 percent while re-dispatch costs increased from $610,000 to $830,000, or about 36 percent. Most of these costs were due to intra-zonal congestion, which was driven by transmission line maintenance during December.
The average total cost of Ancillary Services declined in December from $0.55/MWh to $0.49/MWh. The number of bid insufficient hours fell from 14 in November to 7 in December.
Total unit commitment costs increased sharply to $2.3 million in December, up from $975,000 in November. The increase was driven primarily by Southern California Import Transmission (SCIT) nomogram generation requirements, because a significant amount of base load generation was off-line for maintenance through the first two-thirds of the month.
Total inter-zonal congestion costs increased marginally from $5 million in November to $6 million in December. Two thirds of these costs occurred on the Palo Verde branch group and were driven by transmission line maintenance.
Document Locations:
|
Back to Previous Page