NOTICE DATE:  June 25, 2012

NOTICE TYPE:  M-A052512-03 NPRR

SHORT DESCRIPTION:  ERCOT support for SCED Look-Ahead Step 1 - implementation of NPRR351

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  June 28, 2012

LONG DESCRIPTION:  On June 28, 2012, ERCOT will implement Nodal Protocol Revision Request (NPRR) 351, SCED Look-Ahead Step 1: Pricing: Calculate Non-Binding Prices and Base Points for Initial Research into SCED Look-Ahead and allow Consumers to have a Forward Price Projection (formerly "Calculate and Post Projected Non-Binding LMPs for the Next 15 Minutes"), which was approved by the ERCOT Board on December 12, 2011. NPRR351 will allow ERCOT to calculate future indicative non-binding prices and base points for at least 15 minutes into the future.

NPRR351 requires the following new postings on the Market Information System (MIS):

Emil ID

Name & Naming Convention

Security

Report ID

MIS Landing Page

ERCOT.com Location

NP6-970-CD

RTD Indicative LMPs by Resource Nodes, Load Zones and Hubs*

cdr.00013073.0000000000000000.YYYYMMDD.HHMMSS.RTDLMPRNLZHUBNP6970_YYYYMMDD_HHMMSS.ext

Public

13073

Real-Time Market, Real-Time Prices portlet

Market Information, Real-Time Market, Market Prices

NP6-971-CD

RTD Indicative Base Points by Resources*

cdr.00013074.0000000000000000.YYYYMMDD.HHMMSS.RTDBPRESNP6971_YYYYMMDD_HHMMSS.ext

Certified

13074

Real-Time Market, QSE Real-Time Market portlet

N/A

*The reports will be posted in xml and csv formats as zip files with the naming convention shown above where the first timestamp indicates the posting time and the second timestamp is the RTD Timestamp.

Even though these postings will contain indicative "projected prices" and "non-binding Base Points", ERCOT will implement data delivery monitoring tools and on-call support to comply with paragraph (6) of Protocol Section 6.5.7.3, Security Constrained Economic Dispatch, which requires ERCOT shall calculate at a frequency of every five minutes. Additional support details follow:

*         Data postings missed due to model load or system outages

*         Will not be backfilled and/or re-posted as is done for production SCED results



*         Data delivery format

*         All data posted as CSV and XML files on MIS Public and Certified Areas as appropriate

*         GetReports WebService can be used to download the CSV/XML files



*         Data delivery that is not supported

*         Dedicated WebService query for price data

*         SCADA delivery (no ICCP for Base Points and prices)

*         Graphical or tabular representation of prices (no dashboards)

*         No price correction files will be posted if errors occur

All calculations for future intervals are estimates only and are subject to alterations based on changes in estimated load, topology, offers, and other differences as the Real-Time binding SCED interval approaches. Decisions made by Market Participants based on the indicative prices are at their own discretion and risk. ERCOT staff will use best-efforts to respond to market questions during Business Hours regarding the indicative Base Points and prices.

ADDITIONAL INFORMATION:  NPRR351 and associated documents can be found on the ERCOT website, under Market Rules, at http://www.ercot.com/mktrules/issues/nprr/351-375/351/index.

Refer to the Current Day Reports XSD, V6.0 posted on ERCOT.com at http://www.ercot.com/services/mdt/xsds/ for further report information.

Information on upcoming releases can be found on the ERCOT Multi Year Project Priority List (PPL) at http://www.ercot.com/services/projects/.

CONTACT:  If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at [log in to unmask]<mailto:[log in to unmask]>.

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