1. WECC Annual Meeting 9/11/2018 Cameron Warren

2. Entergy’s Transmission System
Entergy Overview
HQ in New Orleans, LA
Approximately $11 B revenues
More than 13,000 employees
~15,700 circuit miles of transmission lines (operated at 69kV to 500kV) and ~1,500 substations
Approximately 30,000 MW of generating capacity, including 9,000 MW of nuclear power
Reliably serves 2.9 million utility customers in AR, LA, MS, MO, TX
Regulated by FERC, APSC, LPSC, MPSC, PUCT, and City Council of New Orleans
161 kV lines
115 kV lines
500 kV lines
230 kV lines
138 kV lines
69kV lines
Entergy’s Transmission System

3. Entergy Reliability Coordination History
1998 – Entergy leaves Southwest Power Pool (SPP), picking up the role of Reliability Coordinator
2006 – Entergy receive FERC approval for Independent Coordinator of Transmission (ICT)
SPP, in an independent oversight role, administers the Entergy Tariff and serves as the Reliability Coordinator for Entergy
2012 – MISO becomes the ICT for Entergy
November 2012, MISO begins administering the Tariff and serving as Entergy’s RC
2013 – Entergy joins the MISO RTO December 2013

4. Congestion Management along Seams
Entergy has ties with multiple utilities with many having different RCs
RCs: MISO, SPP, SOCO, TVA, ERCOT(emergency tie)
Some are in MISO or SPP market, and some are not
Methods of controlling congestion along seams
Established joint operating agreements
Standing Operating guides
NERC TLR process
As a TOP if Entergy observes congestion at the seams or congestion being impacted by another utility, Entergy works with MISO as the RC to address
Neighboring TOPs communicate directly for outage coordination and the operating of tielines.
RCs are kept informed and get involved if necessary to resolve conflicts.

5. Real-Time Modeling
Past studies indicated how much of the neighboring system needed full topology and how much could be equivalenced .
Entergy taking an approach to go to full topology for all first tier neighbors.
Model expanding from ~ 4,000 buses to ~16,000 buses.
Better representation under varying conditions (loop flows)
Easier external model updates
Prepares a pathway for utilizing CIM model exchange within SERC
Better alignment with our RC
Coordination among neighboring entities
SERC RMWG
Utilize information from MISO model

6. Contact info
Cameron Warren
Mgr., Transmission Operations Engineering
Tel: (501)