Briefing to Dickinson City Council

1. Briefing to Dickinson City Council July 8, 2014

2. TNMP Gulf Coast Region

3. TNMP Mainland Area Customers • Texas City = 21,625 • Dickinson = 11,015 • La Marque = 5,462

4. Measuring Reliability How Reliability is Measured Total Outage Minutes = ÷ Total number of customers SAIDI = Total Number of Outages ÷ Total number of customers SAIFI

5. Dickinson Reliability (Year-to-Date May 2014)

6. Dickinson Outage Causes

7. Vegetation Management • TNMP’s vegetation management has a time-based component that incorporates mowing, herbicide treatment, hazard tree removal and trimming • There is also a condition-based component that provides for TNMP to address hazard tree removal and tree trimming based on site inspections and outage incidents • TNMP recommends specific schedules according to growth rate and types of trees located in the geographic area and the types and configuration of electric distribution facilities in proximity of vegetation • TNMP inspects and trims entire circuits, to improve efficiency and incorporates “spot” trimming when needed

8. What Can Customers Do? • TNMP has a tree care guide book available on TNMP.com that references ideal trees for planting as well as many other helpful tree care basics • Trim or remove a tree that is close to or interfering with service wires • TNMP will, at no charge, temporarily disconnect the service so that the customer, or a professional arborist, can safely trim around electric lines

9. Maintenance Program • TNMP performs line patrols on distribution circuits. • TNMP performs transmission line patrols 3 times per year, two are land patrols and the third one is an aerial patrol. The aerial patrol was completed 6/20/14 • TNMP has spent approximately $872K in Dickinson on reliability projects since January 2011 • Infrared and corona inspections are performed when conditions warrant

10. System Improvements • Pole and hardware change-outs • Automated Meters—reduces the amount of time for energizing and de-energizing transactions • Wildlife Protection • Line Sectionalizing • Outage Management System

11. Future System Improvements • Hardening the System—rebuilding transmission line between League City and Dickinson, target date 2015 • Substations –provides capacity for load growth and contingency options for Dickinson customers: • Butler Road Substation – 2015 • Hidden Lakes Substation – 2017 • Mainland Substation – 2017

12. Emergency Operations Plan • TNMP’s Emergency Operations Plan (EOP) is updated every spring • Storm material and fuel are replenished • Several meetings and a mock drill are complete by June 1st • TNMP’s EOP is reviewed with employees and assignments are discussed

13. Emergency Operations Plan • Everyone except TNMP’s core group is released • TNMP’s core group will be operating out of the Alvin facility and responding to emergency calls until it is not safe for employees to respond • TNMP will be in contact with the City throughout the event and will be communicating the condition of the transmission and distribution system • Once the storm passes and it is safe the core team will begin restoring power

14. Emergency Operations Plan • TNMP employees are expected to return within 24 hours to begin restoring service to high priority circuits and performing assessments of TNMP’s system • TNMP crews will be arriving from Central and North Texas, along with crews from New Mexico • Mutual Assistance crews will be allocated to TNMP • The crews will staged at a specific location and will be assigned to substations on TNMP’s system • Crews will work on the highest priority circuit first and continue work until all circuits have been restored • Progress will be communicated to the City daily

15. Q & A