ERCOT PUBLIC10/21/2014 1

2015 RTP Scope and Process Review

October 21, 2014

ERCOT PUBLIC10/21/2014 2

Outline

2015 RTP: What’s New

2015 RTP Process

2015 RTP Timeline

ERCOT PUBLIC10/21/2014 3

2015 RTP: What’s New

New TPL Standard TPL-001-4 will be in effect for

2015 RTP

Scope of contingency definitions considered for the

RTP will be broadened to include all categories

applicable to TPL-001-4

Additional sensitivity cases and analysis will be

performed

ERCOT PUBLIC10/21/2014 4

2015 RTP: Impact of new TPL standards

New Off-peak (minimum load case) will be studied as

a base case along with the summer peak cases

New contingency categories, P0-P7 and extreme

events instead of A, B, C and D will be studied

Shunt devices to be considered as single element

contingencies

Open Line (one-end of the line) without a fault

Definition of second level contingency in G-1+N-1 expanded

to include Generators and Shunt devices

ERCOT PUBLIC10/21/2014 5

2015 RTP: Impact of new TPL standards

Non-consequential load shedding shall no longer be

an acceptable mitigation plan for the following

contingencies P2-2-Bus Section Fault (345-kV)

P2-3 Internal failure of non-bus tie breaker (345-kV)

P3-1 G-1+G-1

P4 – Stuck breaker of non-bus-tie breaker (345-kV)

P5 – Failure of non-redundant relay (345-kV)

Req. 3.3.1 of TPL-001-4 requires automatic tripping of elements

where relay loadability limits are exceeded post-contingency Until such ratings are added to the models a default limit of 115% will be

used for 345-kV elements and 100% will be used for elements below 345-

kV

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2015 RTP: Impact of new TPL standards

New sensitivity cases will be studied for each of the base cases

The sensitivity case for 2015 RTP will be prepared to study the effect of reduced reactive resource capability

Short Circuit Analysis will be conducted on year 3 and 5 summer peak cases with all projects modeled.

ERCOT PUBLIC10/21/2014 7

2015 RTP: Other updates

Reserve margin of 2800 MW (instead of 1375 MW) will be used in the reliability cases to address G-1+G-1 conditions

Dynamic ratings will be applied in reliability analysis (in addition to the economic analysis)

TPs will be requested to identify generic equipment type which may take longer to replace; these will be studied as a first level contingency in N-1+N-1 test

ERCOT PUBLIC10/21/2014 8

2015 RTP Process

ERCOT PUBLIC10/21/2014 9

2015 RTP: Timeline (tentative)

Deliverable Date

RTP Scope Developed October 2014

RTP Scope Finalized December 2014

Data request to TSPs Completed January 2015

Initial Conditioned Cases Posted February 2015

Reliability Analysis Complete July 2015

Economic Analysis Complete August 2015

Draft Report Sent Out for TP review September 2015Final Report Published November 2015

ERCOT PUBLIC10/21/2014 10

Questions?

ERCOT PUBLIC10/21/2014 11

Contingency Categories

CategoryInitial

ConditionEvent

Load Shedding allowed? Category

under Old TPL> 300 kV

<= 300 kV

P0 System intact None N N Cat AP1-1

System intact

G-1 (generator) N N Cat B1P1-2 T-1 (transmission) N N Cat B2P1-3 X-1 (transformer) N N Cat B3

P1-4 S-1 (Shunt device including FACTS devices that are connected to ground) N N  P1-5 DC N N Cat B4P2-1

System intact

Open Line (one-end of the line) W/O Fault N N  P2-2 BS (Bus section fault) N Y Cat C1P2-3 NBTB (Internal failure of non-bus tie breaker) N Y Cat C2P2-4 BTB (Internal failure of bus tie breaker) Y Y Cat C2P3-1

G-1 + System Adjustment

G-1 (generator) N N

Cat C3

P3-2 T-1 (transmission) N NP3-3 X-1 (transformer) N N

P3-4 S-1 (Shunt device including FACTS devices that are connected to ground) N N

P3-5 DC N N

P4-1

System intactStuck Breaker of non-bus-tie breaker (NBTB) for the fault associated with

G-1 N Y Cat C6P4-2 T-1 N Y Cat C7P4-3 X-1 N Y Cat C8P4-4 S-1 N Y  P4-5 BS N Y Cat C9P4-6 Stuck Breaker of bus-tie breaker (BTB) for the fault associated with BS   Y Cat C9

P5-1

System intact Failure of non-redundant relay for the fault associated with

G-1 N Y Cat C6P5-2 T-1 N Y Cat C7P5-3 X-1 N Y Cat C8P5-4 S-1 N Y  P5-5 BS N Y Cat C9P6-1

N-1 + Adjustment

T-1 (transmission) Y Y

Cat C3P6-2 X-1 (transformer) Y Y

P6-3 S-1 (Shunt device including FACTS devices that are connected to ground) Y Y

P6-4 DC Y Y

P7-1System intact

Two adjacent circuits on common structure. (exclude if 1 mile or less) Y Y Cat C5P7-2 Loss of a bipolar DC Y Y Cat C4