DEEP Update GARY SIMONSON 8182016 DEEP Overview Douglas

DEEP Overview §Douglas, Elbert, El Paso, & Pueblo counties § Formed in 2010 §DEEP

Past Meetings § 6/17 call o Discussed study plan o Added Big Sandy-Calhan 230

2016 DEEP Studies Overview § Base Cases: o DEEP 2021 HS o CCPG TPL

Injection Study Overview § Base Case: o DEEP 2021 HS § Propose: o To

Injection Study Overview Cont. § Scope & study performance criteria: o DEEP 2021 HS

Next Steps § Continue studies § Schedule meeting in September/October time frame to discuss

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DEEP Update GARY SIMONSON 8/18/2016

DEEP Overview §Douglas, Elbert, El Paso, & Pueblo counties § Formed in 2010 §DEEP SC continues to monitor region on an annual basis.

Past Meetings § 6/17 call o Discussed study plan o Added Big Sandy-Calhan 230 k. V sensitivity to 5 year cases o DEEP contingencies o Discussed scope & expectations for injection scenario § 8/5 call o Finalized and approved study plan with revisions to injection scenario o Kicked off studies

2016 DEEP Studies Overview § Base Cases: o DEEP 2021 HS o CCPG TPL WG 2020 -21 HS o CCPG TPL WG 2026 HS § Studies: o DEEP defined as buses greater than 100 k. V in zones 700, 704, 712, 752, & 757 o DEEP N-0, N-1, & credible N-2 steady-state analysis on all cases o Big Sandy-Calhan 230 k. V project sensitivity in the 5 year cases o New DEEP injection study (details on next slide) § Final 2016 report 12/31/2016

Injection Study Overview § Base Case: o DEEP 2021 HS § Propose: o To satisfy concerns that was raised in the 2015 CCPG meetings around the queuing list of potential generator interconnection request within the DEEP footprint § Objective: o Evaluate DEEP area performance with new injections at key substations (Midway, Boone, & Comanche)

Injection Study Overview Cont. § Scope & study performance criteria: o DEEP 2021 HS o DEEP N-0, N-1, & credible N-2 steady-state analysis o Each injection location will be studied separately and a generic generator placed at the Midway, Boone, & Comanche buses (group decision to use a Baculite unit as the generic generator) o New injection will be increased until significant thermal overloads are observed o Once thermal overloads are observed, the flow at cut plane areas north of Midway, Boone, & Comanche will be recorded o If time and resources permit, we will also pursue evaluation combinations of new injections at the Midway, Boone, & Comanche buses

Next Steps § Continue studies § Schedule meeting in September/October time frame to discuss preliminary results § Final 2016 DEEP report 12/31/2016