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Nodal Stabilization Market Call

Nodal Stabilization Market Call. December 27, 2010. Antitrust Admonition. ANTITRUST ADMONITION

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Nodal Stabilization Market Call

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  1. Nodal Stabilization Market Call December 27, 2010 http://nodal.ercot.com 1

  2. Antitrust Admonition ANTITRUST ADMONITION ERCOT strictly prohibits Market Participants and their employees who are participating in ERCOT activities from using their participation in ERCOT activities as a forum for engaging in practices or communications that violate the antitrust laws. The ERCOT Board has approved guidelines for members of ERCOT Committees, Subcommittees and Working Groups to be reviewed and followed by each Market Participant attending ERCOT meetings. If you have not received a copy of these Guidelines, copies are available at the Client Relations desk. Please remember your ongoing obligation to comply with all applicable laws, including the antitrust laws. DISCLAIMER All presentations and materials submitted by Market Participants or any other Entity to ERCOT staff for this meeting are received and posted with the acknowledgement that the information will be considered public in accordance with the ERCOT Websites Content Management Operating Procedure. http://nodal.ercot.com 2

  3. General Updates / Reminders • Reminder: Market Call Schedule • This week’s call Schedule: • 12/28/2010 – 4:30 PM • 12/29/2010 – 4:30 PM • 12/30/2010 – 9:00 AM • 12/31/2010 – No Call • ERCOT will review the January call schedule on the Market Call scheduled for 1/3/2011 4:30 PM • Missing Interval 23:45 – 24:00 on RTM SPP Display • The Real-Time Settlement Point Price (SPP) Report found under Real-Time Prices Displays at http://www.ercot.com/mktinfo/rtm is missing the last 15-minute interval (23:45-24:00) for each day • ERCOT is working to correct this issue and will start posting the missing interval once the correction is complete • A follow-up Market Notice will be sent, once corrected • The missing interval data is currently available in the Settlement Point Prices at Resource Nodes, Hubs, and Load Zones report found under Real-Time Prices Reports on the same page http://nodal.ercot.com 3

  4. General Updates / Reminders • Use of ONTEST Resource Status over Telemetry: • ERCOT protocol permits the use of telemetered Resource Status code “ONTEST” during periods of start-up and shut-down sequence, Section 6.5.7.8 (1), Dispatch Procedures • ERCOT Operations is observing that some QSEs are ramping units off-line in “ONTEST” status well above the LSL and at relatively high ramp rates. This is creating operational concerns, particularly, at or around 2200 • ERCOT is making the following changes effective immediately: • Generation Resources are expected to be on normal SCED control until reaching no greater than 110% of the units normal LSL before changing status to "ONTEST” • To accomplish this, the QSE should do one of the following: 1. Allow SCED to move the unit down to LSL by normal dispatch; 2. The QSE may telemeter the unit’s HSL = LSL in order for SCED to move the unit to LSL at normal ramp rate; then when at or below 110% of LSL the QSE changes the unit status to “ONTEST” for shut-down sequence, • If the QSE is unable to accommodate option one or two, then the QSE shall contact the ERCOT operator and request to switch unit to "ONTEST” for unit shut-down. The ERCOT operator will make every attempt to accommodate this request if and when system conditions allow • Note that his change is for shut-down sequence only. The associated business practice, “ERCOT and QSE Operations Practices During The Operating Hour”, will be updated to reflect this change http://nodal.ercot.com 4

  5. Real-Time LMP and SPP FAQ • Question: • Why are prices at locations close to one another so different from each other when either: • 1. there are no transmission constraints, or • 2. active transmission constraints should affect the locations similarly? • Answer: • It is likely that you are comparing Resource Node Settlement Point Prices, when you should compare LMPs for this purpose. You should see that the LMPs are very close to each other. RN SPPs are base-point weighted (Protocols 6.6.1.1), so these prices can vary considerably when resources are going online or offline during the Settlement Interval. http://nodal.ercot.com 5

  6. Real-Time LMP and SPP FAQ http://nodal.ercot.com 6

  7. Real-Time LMP and SPP FAQ http://nodal.ercot.com 7

  8. Real-Time LMP and SPP FAQ • See Excel spreadsheet posted under today’s meeting page for previous example that you can modify. http://nodal.ercot.com 8

  9. Real-Time LMP and SPP FAQ • Question: • I am comparing LMPs (not SPPs) and there is still a significant difference in price that can’t be explained by constraints. What is the cause? • Answer: • The most likely cause is that one of the prices you are looking at is for a de-energized electrical bus, and is priced in accordance with Protocols 6.6.1(c): • (a) Use average LMP for Electrical Buses within the same station having the same voltage level as the de-energized Electrical Bus, if any exist. • (b) Use average LMP for all Electrical Buses within the same station, if any exist. • (c) Use system lambda. • (a) and (b) should result in a similar price to the surrounding area. (c), however, could result in a very different price. http://nodal.ercot.com 9

  10. Questions? http://nodal.ercot.com 10

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