***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. ***** NOTICE DATE: April 19, 2017 NOTICE TYPE: M-A041917-01 Operations SHORT DESCRIPTION: Implementation of Revised ERCOT Fast Responding Regulation Service (FRRS) Parameters INTENDED AUDIENCE: ERCOT Market Participants DAY AFFECTED: April 25, 2017 LONG DESCRIPTION: On April 25, 2017 ERCOT will implement changes to the FRRS Deployment parameters. Changes will include increasing the Max Deployment Time from 60 seconds to 90 seconds and adjusting the Deployment Band Trigger Frequencies by 5 mHz. The trigger frequencies effective April 25, 2017 are shown in Table 1. High Frequency Trigger (Greater Than) Low Frequency Trigger (Less Than) Band I 60.025 59.975 Band II 60.035 59.965 Band III 60.045 59.955 Table 1: New Deployment Band Trigger Frequencies These changes are designed to align the amount of deployments and length of deployments proportionally with the current frequency profile. Parameters for FRRS deployment are subject to change based on ERCOT's frequency control performance and system needs. A Market Notice will be issued prior to implementing the parameter changes. ADDITIONAL INFORMATION: Questions regarding these changes can be directed to ERCOT Operations Planning<mailto:[log in to unmask]>. CONTACT: If you have other 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]>. If you are receiving email 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. mm