MATL Path 83 Transfer Capability with Seasonal SOL Affects

M A T L
Reference
Document
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
1.
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
Distribution Restriction:
MATL OASIS
Purpose
This document outlines the Transfer Capability on MATL Path 83 for both long-term
capability and for current seasonal capabilities adjusted for known System Operating
Limits (SOLs), such as adjacent system constraints that limit the Available Transfer
Capability. MATL’s Path 83 Transfer Capability adjusted for such SOLs becomes the
basis for the current year’s short-term ATC.
2.
References
•
•
•
•
•
3.
MATL 2007 Phase II Path Rating Study Report
MATL 2012 Phase II Path Rating Study Report
MATL Summer 2013 SOL Study Report
MATL 301- Normal Operations Planning
MATL 804 - ATCID
Responsibility
MATL is an independent merchant transmission-only company based in Calgary, Alberta,
Canada doing business in Canada as Montana Alberta Tie LTD and in the United States as
MATL LLP, collectively referred to as “MATL”. MATL retains the responsibility of
performing seasonal studies to determine its System Operating Limit (SOL) in accordance with
the Peak RC methodology for the operations horizon.
4.
Long Term Capability
MATL Path 83 is a 346 km, 240/230kV, 330 MVA transmission line designed for continuous
power transfers of up to 325 MW north-to-south and 300 MW south-to-north metered at
MATL 120S.
Based on the Phase II Path Rating studies approved by the PRG and accepted by the WECC
PCC, MATL Path 83 is able to achieve the following ratings metered at MATL 120S
substation:
MATL Path 83 Transfer Direction
North-to-south
South-to-north
MATL 120S
325 MW
300 MW
MATL Path 83 southbound long term capability identified in the table above is contingent upon
seasonally studying the limitation identified in section 5.
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M A T L
Reference
Document
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
5.
Distribution Restriction:
MATL OASIS
Limiting Conditions
Conditions limiting the availability of MATL Path 83 Transfer Capability will be analyzed
seasonally by determining the System Operating Limit (SOL) in accordance with the Peak RC
methodology for the operations horizon.
Based on the seasonal studies reviewed by the NOPSG and submitted to the Peak RC, MATL
Path 83 is able to achieve the following seasonal limits with all circuit equipment in service.
As a result, any combination of operation within these maximum limits is acceptable under
normal operating conditions.
The SOL on MATL is adjusted in accordance with additional study work for conditions when
MATL’s equipment such as its series compensation at Hay Lake and Marias are out of service.
Under certain import and export scenarios where the direction of the flows on WECC
designated Path 1 and MATL Path 83 are in opposite direction with respect to Alberta’s
market, MATL’s SOL may be reduced due to the Phase Shifting Transformer (PST) reaching
its angle limit.
Imports into Alberta
Maximum flow at
MATL 120S into
Alberta (MW)
Maximum
Northbound flows at
CA-USA border
(MW) AB.MT.MATL
Maximum flows at
Great Falls into
Alberta (MW)
Normal Operations
300
310 1
325
Hay Lake and Marias
series compensation
out of service
248
2541
266
Maximum flow at
MATL 120S into
Montana (MW)
Maximum
Southbound flows at
CA-USA border
(MW) AB.MT.MATL
Maximum flows at
Great Falls into
Montana (MW)
Normal Operations
325
3151
300
Hay Lake and Marias
series compensation
out of service
263
2561
245
MATL SOL
Northbound
MATL.NWMT
Imports into Montana
MATL SOL
Southbound
1
MATL.NWMT
For metered flows at CA-USA border as Balancing Authority boundary interchange between AESO and NWMT.
Page 2 of 15
M A T L
Reference
Document
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
Distribution Restriction:
MATL OASIS
5.1 Northbound Limit
The studies identified that there is a limitation on the maximum simultaneous import into
Alberta between Path 1 and MATL Path 83. However, the allocation of imports into Alberta
will be determined by AESO as per their Available Transfer Capability (ATC) and Transfer
Path Management rule. The rule ensures that the total flow on Path 1 and MATL Path 83 is
less than the sum of Path 1 and MATL Path 83 simultaneous limits.
5.2 Southbound Limit
For southbound flows into Montana at Great Falls, MATL Path 83 is able to achieve its full
capability as documented in the WECC Path Rating studies unless real-time constraints
necessitate curtailment.
5.3 North Terminal vs. Border POR/POD
For Transmission Service requests under the MATL Tariff, the north terminal is the MATL
120S Substation 240 kV bus near Lethbridge, Alberta. However, the POR/POD to be used for
the MATL Line north end must be represented at the Canada-USA Border identified as a
POR/POD with point name of AB.MT.MATL. This enables the Alberta portion of the MATL
Line to be internalized within the AESO market and AESO Balancing Authority Area, which is
in conformance with AESO procedures and Alberta governance. The Alberta portion of the
MATL Line is further described in MATL’s Procedure MATL-814 “MATL Line Losses in
Alberta” posted on MATL’s OASIS under the Business Practices folder. The Available
Transfer Capability (ATC) for the MATL Line is posted on MATL OASIS under the “System
Data” prompt. Sample diagrams of the MATL Line PORs/PODs are illustrated in Section 6
below.
6. ATC computation in the Scheduling Horizon
MATL computes all scheduled energy flows and transmission service requests in its calculations
to update its Available Transfer Capability (ATC) in real-time. The sum of existing firm
commitments along with Capacity Benefit Margin (CBM) and Transmission Reliability Margin
(TRM) are subtracted from the Total Transfer Capability (TTC) to determine MATL’s ATC at
any given time during the Scheduling Horizon. All TSRs and scheduled energy tags are attested
against the ATC to decide if a request for a new TSR or the request to schedule energy will be
approved or rejected. To determine the remaining ATC that would be available for new TSRs,
MATL continuously and simultaneously decrements the TTC on each segment of the MATL
Page 3 of 15
M A T L
Reference
Document
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
Distribution Restriction:
MATL OASIS
Line for each confirmed and pending TSR. The same procedure is used to determine non-firm
ATC, including the release of transmission capacity from unscheduled energy in the Scheduling
Horizon. If the recalculated ATC is negative for either segment of the MATL Line, MATL’s
curtailment manager software will curtail schedules as necessary to restore ATC from a negative
value.
6.1 Northbound Flows Example
As depicted by the flows in Figure 1 below, MATL’s firm ATC is 0 MW for a scenario where
AESO’s ATC into Alberta on MATL is 300 MW and existing firm commitment of 300 MW is
in place between MATL and its customers. On the contrary, non-firm ATC is 61 MW as a result
of unscheduled firm commitment released as non-firm capacity in the Scheduling Horizon.
Page 4 of 15
M A T L
Reference
Document
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
Distribution Restriction:
MATL OASIS
MATL 120S
AESO ATC = 300 MW
POD: AB.MT.MATL
Canada/US Border
MATL TTC = 300 MW
MATL firm ATC = 0
MATL non-firm ATC = 61 MW
239 MW
POR: WWA
Hay Lake
RimRock
189 MW (Firm)
50 MW (Firm)
POR: MATL.NWMT
Great Falls
Figure 1: MATL's Northbound ATC in Scheduling Horizon
6.2 Southbound Example
As depicted by the flows in Figure 2 below, MATL’s firm ATC is 200 MW for a scenario where
the TTC into Montana on MATL is 300 MW and existing firm scheduled commitment of 100
MW is in place between MATL and its customers. Similarly, non-firm ATC is also 200 MW
since there is no unscheduled firm commitment that can be released as non-firm capacity in the
Scheduling Horizon.
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M A T L
Reference
Document
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
Distribution Restriction:
MATL OASIS
MATL 120S
POR: AB.MT.MATL
Canada/US Border
50 MW (Firm)
POR: WWA
Hay Lake
RimRock
50 MW (Firm)
100 MW
POD: MATL.NWMT
Great Falls
MATL TTC = 300 MW
MATL Firm ATC = 200 MW
MATL non-Firm ATC = 200 MW
NWE ATC = 300 MW
Figure 2: MATL's Southbound ATC in Scheduling Horizon
7. Management of ATC and SOL on Path 83 MATL Line
The POR/POD for MATL’s north terminal is represented at the Canada-USA Border with point
name of AB.MT.MATL. This POR/POD point also represents the interchange between the
MATL and AESO system. Similarly, Path 83 MATL line south end terminal is represented at
the Great Falls substation with point name of MATL.NWMT. The ATC values posted on these
two terminals represents the transfer capability of the MATL line at any given time. As depicted
in Figure-3.0, MATL manages these terminals to ensure that the path is not limited for the Hay
Page 6 of 15
M A T L
Reference
Document
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
Distribution Restriction:
MATL OASIS
Lake connected wind customer under scenarios when an external constraint is identified by
either NWE or AESO.
Page 7 of 15
M A T L
Reference
Document
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
Distribution Restriction:
MATL OASIS
AESO System
Import ATC = AESO’s Real-Time
Value
Export ATC = AESO’s Real-Time
Value
MATL System
POR/POD: AB.MT.MATL
Canada/US Border
Export ATC = AESO’s Real-Time
Value
Import ATC = 325 MW
POR/POD: WWA
POD: MATL.WWA
Hay Lake
RimRock
MATL System
Import ATC = 325 MW
NWE System
Export ATC = 325 MW
POR/POD: MATL.NWMT
Great Falls
Export ATC = 300 MW
Import ATC = 300 MW
Legend
MATL
AESO
NWE
Figure 3: Management of ATC and SOL on MATL
Page 8 of 15
M A T L
Reference
Document
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
Distribution Restriction:
MATL OASIS
7.1 Southbound Constraint Identified by AESO
MATL export ATC into Alberta at AB.MT.MATL is automatically adjusted by OATI’s Curtailment
Management software by utilizing real-time ATC values provided by the AESO. However, MATL’s
import ATC at the AESO end is set to 325 MW regardless of any constraints in Alberta system. This
ensures that the Hay Lake connected wind customer is not restricted to export southbound into
Montana due to possible real-time constraints in Alberta. This is further illustrated in Figure-4.0 for a
scenario when AESO’s export ATC is 100 MW and MATL’s export ATC is 325 MW into Montana.
Page 9 of 15
M A T L
Reference
Document
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Distribution Restriction:
MATL OASIS
Real Flows <= 100 MW
AESO System
Import ATC = AESO’s Real-Time
Value
Export ATC = 100 MW
MATL System
POR/POD: AB.MT.MATL
Canada/US Border
Export ATC = AESO’s Real-Time
Value
Import ATC = 325 MW
POR/POD: WWA
POD: MATL.WWA
Hay Lake
RimRock
Real Flows = Maximum
Capacity (189 MW)
Real Flows <= 289 MW
MATL System
Import ATC = 325 MW
NWE System
Export ATC = 325 MW
POR/POD: MATL.NWMT
Great Falls
Export ATC = 300 MW
Import ATC = 300 MW
Legend
MATL
AESO
NWE
Figure 4: Southbound Constraint Example
Page 10 of 15
M A T L
Reference
Document
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
Distribution Restriction:
MATL OASIS
7.2 Northbound Constraint Identified by NWE
MATL export ATC into Montana at MATL.NWMT is set to 300 MW as per the SOL studies
coordinated with NWE. Similarly, the import ATC into MATL at the NWE end is set to 325
MW regardless of any constraints in Montana system. This ensures that the Hay Lake
connected wind customer is not restricted to export northbound into Alberta due to possible
real-time constraints in Montana. This is further illustrated in Figure-5.0 for a scenario when
NWE’s export ATC is 100 MW and MATL’s import ATC is 325 MW northbound into Alberta.
Note: MATL ATC posting does not ensure transmission capacity is available through adjacent
scheduling segments.
Page 11 of 15
M A T L
Reference
Document
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Distribution Restriction:
MATL OASIS
AESO System
Import ATC = AESO’s Real-Time
Value
Export ATC = AESO’s Real-Time
Value
MATL System
POR/POD: AB.MT.MATL
Canada/US Border
Import ATC = AESO’s Real-Time
Value
Export ATC = 325 MW
Real Flows <= 289 MW
POR/POD: WWA
POD: MATL.WWA
Hay Lake
RimRock
Real Flows = Maximum
Capacity (189 MW)
MATL System
Import ATC = 325 MW
NWE System
Export ATC = 100 MW
POR/POD: MATL.NWMT
Great Falls
Export ATC = 300 MW
Import ATC = 300 MW
Real Flows <= 100 MW
Legend
MATL
AESO
NWE
Figure 5: Northbound Constraint Example
Page 12 of 15
M A T L
Reference
Document
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
Distribution Restriction:
MATL OASIS
8. Definitions and Acronyms
Unless the context otherwise indicates, any word or expression defined in the NERC
Standards shall have that meaning when capitalized in this Operating Procedure.
The following additional terms are capitalized in this Operating Procedure when used as
defined below:
Term
PRG
WECC PCC
AESO
MATL
NOPSG
NWE
SOGF
WECC
WECC RC
Definition
Project Review Group
WECC Planning Coordination Committee
Alberta Electric System Operator
Montana Alberta Tie Limited
Northwest Operations Planning Study Group
NorthWestern Energy
South of Great Falls (NWE)
Western Electricity Coordinating Council
Western Electricity Coordinating Council Reliability Coordinator
9. Change Procedure for Operating Procedures
MATL will update this document based on the seasonal SOL studies performed
consistent with the Peak RC methodology.
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M A T L
Reference
Document
Document No.
Version No.
MATL-811
1.9
Effective Date
08-14-2014
MATL Path 83 Transfer Capability
with Seasonal SOL Affects
Distribution Restriction:
MATL OASIS
Document Change History
Version No
Reason for Change
Changed By
Date
0.1
Prepared initial draft based on Path Rating and SOL
study results
Aekam Sodhi
06-10-2013
1.1
Provide Great Falls terminal representation in
provided tables.
Darrel Gunst
06-25-2013
1.2
Minor modifications to section 5
Aekam Sodhi
07-02-2013
1.3
Clarification of Purpose statement and footnotes.
Added maximum flows at CA-USA border
Darrel Gunst
07-09-2013
1.4
Added section 6 that describes the computation of
ATC in the Scheduling Horizon;
Aekam Sodhi
07-26-2013
1.4a
Added Sec. 5.3 “North Terminal vs. Border
POR/POD”.
Darrel Gunst
07-30-2013
1.5
Updated section 5 as per southbound SOL values
confirmed by NorthWestern Energy
Removed footnotes 1 and 2 as requested by AESO
Aekam Sodhi
08-09-2013
1.6
Added section-7 on Management of ATC and SOL
on Path 83 MATL Line
Aekam Sodhi
12-05-2013
1.7
Modifications to section-7
Kevin Burns
Larry Monday
12-19-2013
1.8
Added note in section 7.2 as per NorthWestern
Energy
Added language on real-time constraints in section
5.2 as per NorthWestern Energy
Aekam Sodhi
07-24-2014
1.9
Updated SOL table to include scenario when MATL
series compensation is out of service
Aekam Sodhi
08-13-2104
Page 14 of 15

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