Cis Conversion Project Market Communication Plan CNP CIS Conversion Project Workshop September 10, 2019

MARKET COMMUNICATION PLAN (Reminder) Preliminary list of ESIIDs scheduled to be converted to SAP will be provided to Rep of Record(s) a week prior to Release 1 and Release 2 migration via email. Please remember these lists will be a snap-shot in time. A Final or more current list of ESIIDs scheduled to be converted to SAP will be provided to Rep of Record(s) on the day of Release 1 and Release 2 migration via email. Stakeholders, which includes ERCOT and PUCT Staff, will be kept informed throughout the cutover and initial stabilization through Market Notices, Market Calls and where necessary, individual engagement. If an esiid has a switch pending for 2 weeks, out, will not be in the final converted list, it remain in current system and work complete.

MARKET COMMUNICATION PLAN (Reminder) Market Notices Will Include: Market Call(s) Information, Schedules and Status Report of migration(s) Market Call Schedule for Status Reports and Q&A: Technical Go-Live Weekend: Saturday, October 5, 2019 @ 10:00 AM Monday, October 7, 2019 @ 10:00 AM Release 1 Weekend: Saturday, October 12, 2019 @ 10:00 AM Monday, October 14, 2019 @ 10:00 AM Release 2 Weekend: Saturday, October 26, 2019 @ 10:00 AM Monday, October 28, 2019 @ 10:00 AM Response - next business day,

MARKET COMMUNICATION PLAN (Reminder) Designated CIS Conversion Information webpage on CNP.com: CIS Conversion Information Some of the documents currently posted to this webpage includes: List of CNP’s New Rate Descriptions CNP System Conversion Transaction Procedures CNP CIS Conversion Project Updates CIS Conversion FAQs Designated Mailbox: Continue to direct questions, issues and/or concerns to: CISConversionGroup@CenterpointEnergy.com Response - next business day,

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