NOTICE DATE:  October 8, 2009
NOTICE TYPE:  M-A022609-02 Operations
SHORT DESCRIPTION:  Heights SPS in service
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  May 29, 2009
LONG DESCRIPTION:  Per Market Notice M-A022609-01, ERCOT received a proposal from Texas-New Mexico Power Co. (TNMP) for a new Special Protection System (SPS) at the Heights substation. This SPS is intended to protect against post-contingency overloading on the Greenbelt - PH Robinson 138 kV line for the loss of the Heights - Freeway Park / PH Robinson 138 kV Double-Circuit.
Effective May 29, 2009, this SPS was placed in service. However, ERCOT was not previously notified by TNMP that the SPS was operational until last month. This SPS is of local nature and does not affect transfer limits or zonal congestion.
Information regarding SPSs can be viewed on the ERCOT Planning and Operations Information secure website:  http://planning.ercot.com/login/login.
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 e-mail at [log in to unmask]<mailto:[log in to unmask]>.
If you are receiving e-mail from an ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com<http://lists.ercot.com/>.


dh