Download Generation Interconnection Cost Allocation Policy

Generation Interconnection Cost
Allocation Policy
Teresa Mogensen
Director of Transmission Planning
and Service
5/18/01
Generation Customer Meeting
1
ATC Objectives
• Strengthen ATC transmission network
• Improve access of ATC customers to
competitive energy market
– Additional generation interconnections
– Impacts on import capability
5/18/01
Generation Customer Meeting
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Policy
• Include the costs of transmission network facilities
associated with generation interconnections in the
network costs of the ATC system
• Subject to tests:
– Network facilities
– Reasonableness
– Eligibility
5/18/01
Generation Customer Meeting
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Network Facilities
• Facilities must carry network flow and be
judged beneficial to network
• Radial generation leads to network
interconnection point are not included
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Generation Customer Meeting
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Example: Interconnecting
to an ATC Line
Stability
SU
B
D
X
SU
B
A
SU
B
B
rela
y
? Miles
X
SU
BC
relay
____ Interconnection Facilities (new facilities necessary to interconnect generation)
____ Required Upgrades (breakers, system protection and control) resulting from
short circuit and stability studies
____ Subset of Required Upgrades – line addition due to stability
____ Optional Upgrades (thermal and associated upgrade)
____ Existing Facilities
5/18/01
Generation Customer Meeting
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Example: Interconnecting
to an ATC Substation
Line 4
Line 5
Line 3
Line 2
Line 1
____ Interconnection Facilities (new facilities necessary to
interconnect generation)
____ Required Upgrades (breakers, system protection and control)
resulting from short circuit and stability studies
____ Subset of Required Upgrades – line addition due to stability
____ Optional Upgrades (thermal and associated upgrade)
____ Existing Facilities
5/18/01
Generation Customer Meeting
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Reasonableness Tests
• ATC will assess factors including, but not
limited to:
– Distance from generator to existing ATC
system
– Application of general least cost planning
principles
– Point-to-point revenue to annual revenue
requirement comparison
5/18/01
Generation Customer Meeting
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Eligibility Requirements
• Financial screening of generating firm
• Guarantee to cover ATC costs expended if
project fails or does not proceed as planned
• Executed interconnection agreement
5/18/01
Generation Customer Meeting
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Policy Subject to Change
• Policy may be changed at some time in the
future as generation becomes more
plentiful, system configuration changes,
RTO congestion management systems are
implemented or other relevant conditions
occur.
5/18/01
Generation Customer Meeting
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Least Cost Redispatch
• I want to suggest a method that will combine
most effective use of generation to solve a
constraint along with selecting the Least Cost.
5/18/01
Generation Customer Meeting
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Least Cost Redispatch Process
Mike Zahorik
5/18/01
Generation Customer Meeting
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Least Cost Redispatch
• This method will provide Least Cost Plans for 10
of the most probable flowgates that could be
subjected to TLR 5 each day.
• These plans will be made available to the ATC
System Operators Prior to any TLR 5 event.
5/18/01
Generation Customer Meeting
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Least Cost Redispatch
• The ATC Operator will control the TLR 5 Redispatch.
– All Non Firm transactions with >5% PTDF have been curtailed.
– If the overloaded element is in the WEP, WPS or UPP Control
Area, the Pewaukee ATC Operator will be responsible.
– If the overloaded element is in the ALTE or MGE Control Area,
the Cottage Grove ATC Operator will be responsible.
– The responsible ATC Operator will request the needed relief.
5/18/01
Generation Customer Meeting
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Least Cost Redispatch
• The ATC Operator will control the TLR 5
Redispatch.
– MAIN issues Firm transaction curtailment list.
– MAIN also issues Load curtailments, these load
curtailments may be accomplished by redispatch of
generation.
– The responsible ATC Operator will combine the
needed load curtailments and issue the Least Cost
Redispatch.
5/18/01
Generation Customer Meeting
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Least Cost Redispatch
• Least Cost Redispatch Plans
– Will use Unit Costs.
– Will provide plans for the 10 most probable TLR
flowgates.
– Will use NERC Generation Shift Factors.
– These probable plans will be updated daily.
5/18/01
Generation Customer Meeting
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Unit Costs
• Generation Information will be communicated to
ATC each day/week.
– General Cost, to the nearest dollar.
– Unit availability.
– ATC will provide a spreadsheet to be filled out.
5/18/01
Generation Customer Meeting
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Unit Costs
Wisconsin Electric Unit Costs
Unit
Availablity Cost/Mw
WEC_GER GT1 13.8_1
Y
$75.00
WEC_GER GT2 13.8_2
Y
$75.00
WEC_GER GT3 13.8_3
WEC_GER GT4 13.8_4
Y
Y
$75.00
$75.00
WEC_GER GT5 13.8_5
Y
$75.00
WEC_PL PRG1 24.0_1
Y
$10.00
WEC_PL PRG2 24.0_2
Y
$10.00
WEC_POW G1 W22.0_1
Y
$25.00
WEC_POW G2 E22.0_2
WEC_POW G3 W22.0_3
Y
Y
$25.00
$25.00
WEC_PRS GT1 13.8_1
Y
$50.00
WEC_PRS GT2 13.8_2
Y
$50.00
WEC_PRS GT3 13.8_3
Y
$50.00
WEC_PRS GT4 13.8_4
WEC_PT BHG1 19.0_1
Y
Y
$50.00
$5.00
WEC_PT BHG2 19.0_2
Y
$5.00
WEC_UNIV GT 13.8_1
Y
$65.00
5/18/01
• Each Control Area would
provide Generation Costs to
ATC.
• Example of Wisconsin
Electric's costs.
Generation Customer Meeting
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10 Most Probable TLR's
• Each Night Shift, ATC System Operator will
select 10 possible Flowgates that could be
subjected to TLR 5.
– Based on Knowledge of System Topology
– Recent Past History
• ATC System Operator will gather NERC GSF's
for the selected flowgates.
5/18/01
Generation Customer Meeting
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Least Cost Redispatch
Plans
5/18/01
Generation Customer Meeting
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Least Cost Redispatch
Plans
MW Relief Required
50
Paris Albers 138 Kv 3503
Redispatch Redispatch
Increment Unit
Inc
Cost
Decrement Unit
Dec
GSF Delta Cost
Needed
Cost
Cost
WEC_PRS GT2 13.8_2 $50.00
WEC_PL PRG2 24.0_2 $10.00 -50.8 $40.00
98.43
$3,937.01
WEC_UNIV GT 13.8_1 $65.00
WEC_PL PRG2 24.0_2 $10.00 -19.4 $55.00
257.73
$14,175.26
Delta Cost = Inc Cost - Dec Cost
Redispatch Needed = Mw Relief Required / GSF
Redispatch Cost = Redispatch Needed * Delta Cost
5/18/01
Generation Customer Meeting
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Least Cost Redispatch
Plans
• Items the responsible ATC Operator will have to
consider during TLR 5 event.
– ATC Operator may not know the current dispatch of
units and/or the availability to move them.
– ATC Operator will have to inquire if a generator pair is
available.
– If the Least Cost Redispatch spans two control areas,
the control areas will have to enter schedules.
5/18/01
Generation Customer Meeting
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Summary
• ATC Operator controls Redispatch
• MAIN issues Firm curtailment lists and Load
Relief numbers
• Control Area's supply Unit Costs
• ATC Operator calculates and issues Redispatch
orders.
• If Redispatch is not available, load shedding will
be necessary.
5/18/01
Generation Customer Meeting
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Update on Single System ATC
Teresa Mogensen
Director of Transmission Planning
and Service
5/18/01
Generation Customer Meeting
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Single System ATC:
Non-Firm
• The “Proposed Changes to the Calculation of
Non-firm ATC for the ATCLLC Transmission
System” document was approved by the MAIN
ATCSC on April 10, 2001 and implemented on
April 25, 2001
5/18/01
Generation Customer Meeting
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Single System ATC:
Non-Firm (cont.)
• A single ATCLLC non-firm ATC value is
calculated and shared by all network customers of
the ATCLLC for each of the interconnected
directions
– CEWUMS, DPCWUMS, NSPWUMS,
UPPCoWUMS and MECSWUMS.
– Note that WUMS is a proxy for “ATCLLC”
– UPPCo will be added to this group when they become a
network customer
5/18/01
Generation Customer Meeting
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Single System ATC:
Firm
• There are several issues associated with a single
zone approach to granting firm transmission
service including:
– Identification of true source/sink
– Impacts on the transmission system based on the true
source/sink
– The work group has been unable to reach consensus
• The work group is drafting a proposal titled
“Single Zone Firm ATC” for executive review
5/18/01
Generation Customer Meeting
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Single Zone Firm ATC:
Latest Proposal
• Only applies to studies within the next 13 months
• Continue to calculate every control area to control
area path
• Calculate the Firm Service Load Ratio Share
(FSLRS), based on each network customers’ load
in proportion to total ATCLLC network load
• Determine which path is most constrained, taking
into account the FSLRS
• Constrain all directions based on the most
constrained path and FSLRS
5/18/01
Generation
Customer
Meeting for details
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• Please refer to the
draft
proposal
Single System ATC:
Congestion Management
•
In order to track ATCLLC customer costs due to
“Zero ATC” or TLR events, we have asked all
customers impacted by TLR and/or denied
transmission requests (based on “No ATC”) to
report their estimated replacement costs and
summarize by event
•
This data will be summarized by constraint
(flowgate) and used, in part, to justify new projects
•
ATCLLC is also exploring ways to facilitate use of
the NERC Market Redispatch program for our
customers
5/18/01
Generation Customer Meeting
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Single System ATC:
Next Steps
• Next SSATC Working Group meeting is June 5 at
ATC HQ
– Main goal of June 5 meeting is to finalize “best”
proposal(s) for implementation of single zone ATC for
firm
• Ongoing series of biweekly meetings (June 5, June
19 etc.) to continue to discuss issues
• Your ongoing input and participation is requested
and appreciated.Generation Customer Meeting
5/18/01
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Maintenance Scheduling Process
Don Morrow
5/18/01
Generation Customer Meeting
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Who Do I Talk To?
On the old WEP system:
On the old WPS system:
On the old ALTE system:
On the old MGE system:
5/18/01
ATC-Pewaukee
WPS Operating
ATC-CG
MGE
Generation Customer Meeting
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Who Is ATC-Pewaukee?
• Manager: Mike Zahorik
262-544-7002
• Team Leader: Eric Solberg 262-544-7228
• Security Coordinator: Darrel Yohnk
262-544-7106
• Outage Coordinator: Ed Funk
• Outage Coordinator: Liz Gehrt
• Real Time Operator: 262-544-7008
5/18/01
Generation Customer Meeting
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Who Is ATC-Cottage Grove?
• Manager: Kurt Dickinson 608-877-8237
• Security Coordinator: Francis Esselman
608-877-8172
• Outage Coordinator: Jon Staff 608-877-8208
• Outage Coordinator: Bill Hoesly 608-877-8209
• Real Time Operator: 608-877-8233
5/18/01
Generation Customer Meeting
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Upcoming Changes
• ATC-Pewaukee Control Center Move – New Phone #’s
• ATC-CG Assumes Functional Control of Old MGE System
• ATC-Pewaukee Assumes Functional Control of Old WPS
System
5/18/01
Generation Customer Meeting
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Load Shedding Subcommittee
Kurt Dickinson
Manager, System Control
Cottage Grove
5/18/01
Generation Customer Meeting
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LSS - Members
• The following ATC customers have volunteered to
discuss Load Shedding procedures:
•
•
•
•
•
•
•
Chuck Spargo – ACEC
Phil Hansen & Pat Conners – WPPI
Dale Koch – Manitowoc Public Utilities
Paul Roehr – MGE
Tony Jankowski – WE
Jim Maenner (or Chris Plante) – WPS
Ron Graber – Alliant
• Kurt Dickinson – ATCLLC – 608.877.8237
5/18/01
Generation Customer Meeting
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LSS – To Date
The LSS has NOT met yet.
• E-mail sent recently asking for concurrence
on the issues.
• Conference call scheduled Tuesday, June 5,
2001. Kurt will contact everyone with
details.
5/18/01
Generation Customer Meeting
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LSS – The Issues
• Load shedding due to capacity deficiency. Rolling
blackouts/distribution load shedding. This would be the
responsibility of the individual control areas/local distribution
companies or load balancing areas. There would be little or no
involvement by ATCLLC.
• Underfrequency load shedding and manual load shedding due
to frequency decline as required by NERC/MAIN. This issue
will be a little different for each customer and will have to be
discussed.
5/18/01
Generation Customer Meeting
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LSS – The Issues
• Load shedding orders as a result of a Transmission Loading
Relief (TLR) procedure, i.e. TLR level 5. We will definitely
have to determine an acceptable procedure for this situation. If
we run out of Redispatch and Schedule curtailment options,
the act of shedding load to provide relief on a flowgate may
get a bit complicated.
• Specific load shedding as a result of a local transmission
problem. If TLR could not help a particular situation, the
ATCLLC System Control Operator may order shedding of
some specific/local loads to prevent a worse problem (e.g.low
voltage, voltage collapse or major overloads).
5/18/01
Generation Customer Meeting
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LSS – Temporary
Measures
• Until there are specific procedures and processes
developed by ATCLLC and its customers, we will
continue to operate within the procedures and
practices already in place by the utility or control
area.
5/18/01
Generation Customer Meeting
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