Dominion p, Energy®

Glebe Substation Rebuild & Potomac Yards Terminal Station

Undergrounding Project

Update: February 27, 2019

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NERC Reliability Issues Across Existing System

(Spring 2014 – Summer 2018):

Original Project Drivers

Overloads:

Ox 500/230kV Tx #1

Ox 500/230kV Tx #2

230kV Line Hayfield to Va Hills

230kV Line South Carlyle to N. Potomac Yards

230 kV Line Ox to Occoquan

230 kV Line Franconia to Belvoir

Proposed New Line:

Glebe – Potomac River

Tie-line strengthens the grid in Arlington &

Alexandria and improves operational performance

for Dominion Energy Virginia / Pepco customers

Current Project Drivers

• North Potomac Yards original special use permit has expired

- Dominion Energy required to vacate location by 2021

- Proposal to underground lines/structures on Richmond Hwy and

under Four Mile Run

- Cost $52.5 M

• Glebe Substation rebuild

- Existing 230 kilovolt (kV) facilities have reached end of life

- Gas-insulated substation (GIS) needed to make room for new

underground lines

- Cost $69 M

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Glebe Substation Rebuild / "' Potomac Yard Proposal

Highways, Railroads, Streets, Parks, Open Space, Schools,

Hospitals, Airports, Convalescent Centers, & Churches

Existing Substation

- - Existing Overhead Line AirC roo Rd Relocation to Underground O' 500'

-+--+- Railroad Line Airport INSET: Exiati Overhead Line Relocation to Unde round Pendi sec .. " -- Existing Overhead Line

C, - Gasline C,_, ,t Schools

6 Places of Worship

~ Par1<s & Open Space

+PJ~ County of Arlington / City of Alexandria

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DATE: 12/18/2018

Late January 2019

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Submitted 2202 letters to localities

Provided update to locality staff

Sent cultural advocacy letters to stakeholders

Ongoing updates to project website

February 2019

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Review notes from staff

Review feedback from cultural advocacy groups

Ongoing meetings with community/civic associations

March 2019

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Send communication to community residents/businesses

Submit application to VA State Corp. Commission (SCC)

– March 7. 2019

TBD

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SCC Procedural Order issued

Local public hearing

Public evidentiary hearing

Order issued, construction schedule set

May 2022 - Target energize date

Target Schedule