Local Sourcing Requirement (LSR) and Maximum Capacity Limit (MCL) Calculation Methodology

DRAFT

Local Sourcing Requirement (LSR) and Maximum Capacity Limit (MCL) Calculation Methodology

Peter WongManager, Resource Adequacy

RC MeetingMay 14, 2009

RC Meeting – May 14, 2009LSR and MCL Calculation Methodology

© 2009 ISO New England Inc. DRAFT

What is Local Sourcing Requirement and Maximum Capacity Limit?

• Local Sourcing Requirement (LSR) is the minimum amount of capacity that must be electrically located within an import-constrained Load Zone to meet the Installed Capacity Requirement (ICR)

• Maximum Capacity Limit (MCL) is the maximum amount of capacity that can be procured in an export-constrained Load Zone to meet the ICR

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Calculation Steps for LSR and MCL

• Model the Load Zone under study vs. the rest of the New England Control Area using the GE MARS simulation model

– Reflect load and resources electrically connected to them, including external Control Area support from tie benefits

– Model the transmission interface constraint between the Load Zone under study and the rest of the New England

– If the system is less reliable than 0.1 days/year Loss of Load Expectation (LOLE), add proxy units that are required in New England to meet the resource adequacy planning criterion of 0.1 days/year LOLE

– If the system LOLE with proxy units added is less than 0.1 days/year

• Firm load is added (or unforced capacity is subtracted)

• Ensure New England system LOLE equals 0.1 days/year

– If the system is more reliable than 0.1 days/year, then keep the system LOLE as is

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Calculation Steps for LSR and MCL, cont.

• Beginning with the New England system days/year – either “as is” or “at criterion” if proxy units are required

– Adjust the firm load within the Load Zone under study

• Until the LOLE of the New England Control Area LOLE reaches 0.105 days/year

• As firm load is added to the Load Zone under study, an equal amount of firm load is removed from (or added to) the rest of the New England Control Area

• Note that New England’s share of tie benefits from New York, New Brunswick and Quebec are considered pre-existing in the rest of New England

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DRAFT

LSR and MCL Calculated According to Section III.12.2 of Market Rule 1, Local Sourcing Requirements and Maximum Capacity Limits*

* For details, please see http://www.iso-ne.com/regulatory/tariff/sect_3/09-4-1_mr1-sect_1-12.pdf



Methodology for Calculating Local Sourcing Requirement

Calculate the LSR for the import-constrained Load Zone in accordance with the following formula

LSRz = Resourcesz + Proxy Unitsz – (Proxy Units Adjustmentz/ (1-FORz)) – (Firm Load Adjustmentz/ (1-FORz))

in which

– LSRz = MW of Local Sourcing Requirement for Load Zone Z

– Resourcesz = MW of resources electrically located within the Load Zone Z, including Import Capacity Resource on the import-constrained side of the interface, if any

– Proxy Unitsz = MW of proxy unit additions in the Load Zone Z

– Proxy Units Adjustmentz = MW of firm load added to (or unforced capacity subtracted from) Load Zone Z until the system LOLE equals 0.1 days/year

– Firm Load Adjustmentz = MW of firm load added (or subtracted) within the Load Zone Z to make the LOLE of the New England Control Area equal to 0.105 days per year

– FORz = Capacity weighted average of the forced outage rate modeled for all resources within the Load Zone Z, including any proxy unit additions to the Load Zone Z

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Methodology for Calculating Maximum Capacity Limit

Calculate the MCL for the export-constrained Load Zone Y in accordance with the following formula

Maximum Capacity LimitY = ICR – LSRRestofNewEngland

in which

–Maximum Capacity LimitY = Maximum amount of resources, including import Capacity Resources on the export-constrained side of the interface, if any that can be procured in the export-constrained Load Zone Y under study to meet the ICR

–ICR = MW of Installed Capacity Requirement for the New England Control Area

–LSRRestofNewEngland = MW of Local Sourcing Requirement for the rest of the New England Control Area, which for the purposes of this calculation is treated as an import-constrained region. LSRRestofNewEngland is determined in accordance with the methodology presented in prior slides

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DRAFT

LSR and MCL Calculation ExampleUsing ISO Recommended Values for 2012/13 Capability Year



Calculation ProcedureLSR for Connecticut

~Existing

37,059 MW

~TB-NY

~TB-HQ

~TB-MT

LOLE = 0.001

~Existing

27,948 MW

~TB-NY

~TB-HQ

~TB-MT

LOLE = 0.001

Rest of NECT

~Existing

9,111 MW

System LOLE < 0.1 with existing resourcesmodeled, proxy units are NOT needed, andno Proxy UnitsAdjustment (PUAz)is required.

Model the transmission interface between CT and Rest of NE. System LOLE remains at 0.001.Because LOLE is less than 0.105, Firm Load Adjustment (FLAz)will be made.

After adding 2,325 MW load to CT and subtracting 2,325 MW from Rest of NE, system LOLE reaches 0.105. LSR for CT is then determined as LSRz = Resourcesz + Proxy Unitsz – (PUAz/ (1 – FORz)) – (FLAz/ (1 – FORz)) = 9,111 + 0 – 0 /(1 – 0.0592) – 2,325/(1 – 0.0592) = 6,640 MW

~Existing

27,948 MW

~TB-NY

~TB-HQ

~TB-MT

LOLE = 0.105

Rest of NECT

~Existing

9,111 MW

FLA-2,325 MW

FLA2,325 MW

Note: PUAz is the Proxy Units AdjustmentFLAz is Firm Load Adjustment

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Calculation ProcedureLSR for NEMA/BOSTON

~Existing

37,059 MW

~TB-NY

~TB-HQ

~TB-MT

LOLE = 0.001

~Existing

33,246 MW

~TB-NY

~TB-HQ

~TB-MT

LOLE = 0.001

Rest of NEBOS

~Existing

3,813 MW


Model the transmission interface between NEMA/BOSTON and Rest of NE. System LOLE remains at 0.001. Because LOLE is less than 0.105, Firm Load Adjustment (FLAz)will be made.

After adding 1,620 MW load to NEMA/BOSTON and subtracting 1,620 MW from Rest of NE, system LOLE reaches 0.105. LSR for NEMA/BOSTON is then determined as LSRz = Resourcesz + Proxy Unitsz – (PUAz/ (1 – FORz)) – (FLAz/ (1 – FORz)) = 3,813 + 0 – 0 /(1 – 0.0970) – 1,620/(1 – 0.0970) = 2,019 MW

~Existing

33,246 MW

~TB-NY

~TB-HQ

~TB-MT

LOLE = 0.105

Rest of NEBOS

~Existing

3,813 MW

FLA-1,620 MW

FLA1,620 MW


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Calculation ProcedureMCL for Maine

~Existing

37,059 MW

~TB-NY

~TB-HQ

~TB-MT

LOLE = 0.001

~Existing

3,616 MW

~TB-NY

~TB-HQ

~TB-MT

LOLE = 0.001

Rest of NE

ME

~Existing

33,443 MW


Model the transmission interface between Maine and Rest of NE. System LOLE remains at 0.001. Because LOLE is less than 0.105, Firm Load Adjustment (FLAz)will be made.

After adding 4,455 MW load to Rest of NE and Subtracting 4,455 MW from Maine, system LOLE reaches 0.105. LSR for Rest of NE isdetermined as LSRrestofNewEngland = Resourcesz + Proxy Unitsz – (PUAz/ (1-FORz)) – (FLAz/ (1 – FORz)) = 33,443 + 0 – 0 /(1 – 0.0591) – 4,455/(1 – 0.0591) = 28,708 MWMCL for Maine is then determined as MCL = ICR – LSRRestofNewEngland

= 31,965 – 28,708 = 3,257 MW


~Existing

3,616 MW

~TB-NY

~TB-HQ

~TB-MT

LOLE = 0.105

Rest of NE

ME~Existing

33,443 MW

FLA-4455 MW

FLA4,455 MW

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DRAFT

Issue with the Existing LSR and MCL Calculation Methodology



Issue with the Existing Calculation Methodology

• The current methodology used to calculate LSR and MCL does not adjust for surplus capacity unless the surplus is associated with the use of a “proxy unit”

• This is equivalent to calculating LSR and MCL using possible “as is” system conditions

• Using possible “as is” system conditions understates LSR and overstates MCL

• The following tables show the results of the 2012/13 LSR and MCL using “as is” and “at criterion” conditions to illustrate the point

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2012/13 vs. 2011/12 LSR – Connecticut

Connecticut Zone

2011 FCA (FERC

Approved) 2012 FCA2012 (If Calculated At Criterion)

50/50 Peak Load 7,750 7,650 7,650 Resourcez [1] 8,189 9,111 9,111 Proxy Unitsz [2] 0 0 0 Proxy Units (or Surplus Capacity) Adjustmentz [3] 0 0 0 Firm Load Adjustmentz [4] 1,285 2,325 1,680 FORz [5] 0.0637 0.0592 0.0592 LSRz [6]=[1]+[2]-([3]/(1-[5]))-([4]/(1-[5])) 6,817 6,640 7,325Rest of New England Zone resource [7] 26,567 27,948 27,948 Proxy Units [8] 0 0 0 Proxy Units (or Surplus Capacity) Adjustmentz [9] 0 0 4,585 Firm Load Adjustment [10] = -[4] -1,285 -2,325 -1,680Total System Resource [11]=[1]+[2]-[3]-[4]+[7]+[8]-[9]-[10] 34,756 37,059 32,474

Note: resource number for Rest of New England Zone excludes Hydro-Québec Interconnection Capability Credits (HQICCs)

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2012/13 vs. 2011/12 LSR – NEMA/BOSTON

Note: resource number for Rest of New England Zone excludes HQICCs

NEMA/BOSTON Zone

2011 FCA (FERC


50/50 Peak Load 5,815 5,885 5,885 Resourcez [1] 3,753 3,813 3,813 Proxy Unitsz [2] 0 0 0 Proxy Units (or Surplus Capacity) Adjustmentz [3] 0 0 0 Firm Load Adjustmentz [4] 1,570 1,620 1,110 FORz [5] 0.0964 0.0970 0.0970 LSRz [6]=[1]+[2]-([3]/(1-[5]))-([4]/(1-[5])) 2,016 2,019 2,584Rest of New England Zone resource [7] 31,003 33,246 33,246 Proxy Units [8] 0 0 0 Proxy Units (or Surplus Capacity) Adjustmentz [9] 0 0 4,585 Firm Load Adjustment [10] = -[4] -1,570 -1,620 -1,110Total System Resource [11]=[1]+[2]-[3]-[4]+[7]+[8]-[9]-[10] 34,756 37,059 32,474

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2012/13 vs. 2011/12 MCL – MaineLocal Sourcing Requirements - RestofNewEngland (for Maine MCL calculation)

Rest of New England Zone

2011 FCA (FERC


50/50 Peak Load 27,200 26,855 26,855 Resourcez [1] 31,185 33,443 33,443 Proxy Unitsz [2] 0 0 0 Proxy Units (or Surplus Capacity) Adjustmentz [3] 0 0 4,585 Firm Load Adjustmentz [4] 1,935 4,455 -200 FORz [5] 0.0568 0.0591 0.0591 LSRz [6]=[1]+[2]-([3]/(1-[5]))-([4]/(1-[5])) 29,133 28,708 28,783Maine Zone resource [7] 3,571 3,616 3,616 Proxy Units [8] 0 0 0 Proxy Units (or Surplus Capacity) Adjustmentz [9] 0 0 0 Firm Load Adjustment [10] = -[4] -1,935 -4,455 200Total System Resource [11]=[1]+[2]-[3]-[4]+[7]+[8]-[9]-[10] 34,756 37,059 32,474

Maximum Capacity Limit - Maine

Commitment Period

2011 FCA (FERC


50/50 Peak Load 2,205 2,165 2,165ICR for New England [1] 32,528 31,965 31,965LSRRestofNewEngland [2] 29,133 28,708 28,783Maximum Capacity LimitY [3]=[1]-[2] 3,395 3,257 3,182

Note: resource number for Rest of New England Zone and ICR value for New England exclude HQICCs

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Local Sourcing Requirement (LSR) and Maximum Capacity Limit (MCL) Calculation Methodology

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