Demand Integration Update to DSWG ERCOT Emergency Responsive Service (ERS) Report to the Public Utility Commission of Texas for the 2013 ERS Program Year Project No Attachment B

Contents 10/26/2015 ERS Annual Report 2 Procurement Summary Capacity (MW) offered and procured Number & Average Size of ERS-10 Resources Cumulative Individual Sites Participating in ERS-10 Suspensions Due to Availability or Load Test Failures Settlement Summary Detailed procurement results by Standard Contract Term Fleet Level Summary for January 6, 2014 EEA Event

Standard Contract Terms & Time Periods 10/26/2015 ERS Annual Report 3 ERS is procured 3 times annually for 4-month Standard Contract Terms February through May June through September October through January Participants may offer to provide ERS for one or more Time Periods: Business Hours 1: 8AM to 1PM Monday-Friday* Business Hours 2: 1PM to 4PM Monday-Friday* Business Hours 3: 4PM to 8PM Monday-Friday* Non-Business Hours: All other hours *Except ERCOT Holidays Time Periods are designed to allow flexibility for customers during traditional business hours Time Periods have been in effect in current form since the June-September 2008 EILS Contract Period

ERS-10 Capacity Procurement Trends (Business Hours 1) 10/26/2015 ERS Annual Report 4

ERS-10 Capacity Procurement Trends (Business Hours 2) 10/26/2015 ERS Annual Report 5

ERS-10 Capacity Procurement Trends (Business Hours 3) 10/26/2015 ERS Annual Report 6

ERS-10 Capacity Procurement Trends (Non-Business Hours) 10/26/2015 ERS Annual Report 7

Procurement Trends (number & avg. size of Resources) 10/26/2015 ERS Annual Report 8

Cumulative Individual Sites Participation 10/26/2015 ERS Annual Report 9

Suspension History 10/26/2015 ERS Annual Report 10 ERS Resources suspended during the 2013 program year due to availability failures, two consecutive load test failures, or event failures Suspended Resources may regain eligibility only after submitting a corrective action plan and successfully completing a load-shed test administered by ERCOT

Settlement Summary 10/26/2015 ERS Annual Report 11 *Adjustments may be made for the following reasons: availability, event performance, disputes, data corrections.

Demand Integration Update to DSWG 2013 Results by Standard Contract Term

February-May 2013 Standard Contract Term 10/26/2015 ERS Annual Report 13 Total Adjusted Cost for this Standard Contract Term: $ 9,617,304.07

June-September 2013 Standard Contract Term 10/26/2015 ERS Annual Report 14 Total Adjusted Cost for this Standard Contract Term: $ 12,042,160.85

October 2013-January 2014 Standard Contract Term 10/26/2015 ERS Annual Report 15 Total Projected Cost for this Standard Contract Term: $ 12,744,451.58

Demand Integration Update to DSWG Summary for January 6, 2014 EEA Event

January 6, 2014 EEA Event Timeline 10/26/2015 ERS Annual Report 17

Fleet Level Performance for 1/6/2014 Event 10/26/2015 ERS Annual Report 18 Graph is based on 15-minute interval data. Performance is based on a prorated obligation for the 1 st partial interval and one full interval. 1 Resource had prescheduled unavailability from HE on the day of the event (14.6 MWs)

10/26/2015 ERS Annual Report 19 This document is provided for informational purposes only. Procurement and settlement data are subject to revision.