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Flowgate Allocation Method Examples of Proportional Curtailment of FIRM PTP and GTL Minneapolis, November 10-11, 2010.

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Presentation on theme: "Flowgate Allocation Method Examples of Proportional Curtailment of FIRM PTP and GTL Minneapolis, November 10-11, 2010."— Presentation transcript:

1 Flowgate Allocation Method Examples of Proportional Curtailment of FIRM PTP and GTL Minneapolis, November 10-11, 2010

2 Proportional Curtailment of Firm PTP and Firm GTL – Problem Statement Provide equal treatment of FIRM Point-to-Point (PTP) Transaction impacts and FIRM Generation-to- Load (GTL) Impacts during a TLR event – Flowgate allocation does not downgrade FIRM PTP and GTL transactions to NON-FIRM – TLR curtailment of FIRM contributions requires the issuance of a TLR-5 or higher – FIRM contributions are NOT curtailed in TLR-3a, TLR-3b and TLR-4 Allocations are based on forecasted/reserved (Expected) FIRM usage of flowgates up to but not exceeding the flowgate limit – Expected FIRM usage is determined in the Day-Ahead and Hour-Ahead – All Expected FIRM contributions to the flow on the flowgate are included – The total Expected FIRM contributions does not exceed the flowgate limit: BAs and TSPs are allocated FIRM limits to their contribution on the flowgate that equals its total Expected FIRM contributions – The total Expected FIRM contributions exceeds the flowgate limit: BAs and TSPs are allocated FIRM limits to their contribution on the flowgate proportional to their contribution FIRM contributions are placed in two curtailment buckets – LAST TO CUT (LTC) and FIRST TO CUT (FTC) – Nomenclature: PTP transactions:FTC = 7-FLTC = 7-FC GTL:FTC = 7-FNLTC = 7-FCN – FIRM contributions in FTC and LTC are determined in real-time based on current system conditions – LTC: FIRM contributions in the LTC bucket are those that do NOT exceed the Expected FIRM usage of the flowgate for FIRM PTP and GTL impacts – FTC: FIRM contributions in the FTC bucket are those that exceed the Expected FIRM usage of the flowgate for FIRM PTP and GTL impacts

3 Proportional Curtailment of Firm PTP and Firm GTL - Example Flowgate limit:800 MW Allocation: – All Firm PTP transactions – Firm GTL up-to flowgate limit Total Firm PTP allocation:520 MW Total Firm GTL allocation:800 – 520 = 280 MW GTL allocation ratio:280 / 480 = – GTL allocation = (Firm GTL Impact ) x (GTL allocation ratio) EntityDA/HA Firm GTL Impact DA/HA Firm PTP Impact Firm PTP Allocation (1) Firm GTL Allocation (2) Firm Allocation (1)+(2) A B C D E Total ,000800

4 Proportional Curtailment of Firm PTP and Firm GTL - Example Flowgate limit:800 MW EntityFirm Allocation (1) RT Firm GTL Impact (2) RT Firm PTP Impact (3) Total Firm Impact (4)=(2)+(3) Over/(Under) Allocation (5)=(3)-(1) Last to Cut 7F+7FN (6)=Min(1,4) First to Cut 7FC+7FCN (7)=(4)-(6) 7FCN FTC GTL (7)x(2)/(4) 7FC FTC PTP (7)x(3)/(4) A B (13.3) C (13.3)80000 D E Total (10)

5 FTC and LTC Calculations TLR 5a requires curtailment of 10 MW of FIRM transactions after exhausting all NON-FIRM curtailments – 10 MW of relief will be provided pro-rata from 16.7 MW of FTC (7-FC and 7-FCN), using the existing TLR pro-rata formulas Total 7FCN Curtailment:2.5x10/16.7 = 1.5 MW Total 7FC Curtailment:14.2x10/16.7 = 8.5 MW Individual 7FC curtailment:8.5 MW distributed pro-rata among all 7FC transactions – MW of LTC (7-F and 7-FN) are not curtailed EntityLast to Cut 7F+7FN 7FCN FTC GTL 7FC FTC PTP 7FCN Curtailment 7FC Curtailment (*) 7F+7FN Curtailment A x10/16.7 = 6.00 B C D E x2.5/16.7 = 1.510x4.2/16.7 = 2.50 Total (*) Assumes all PTP transactions with the same TDF

6 Proportional Distribution of Under-Allocated Amounts to Over-Allocated GTL/PTP – Issues To Be Resolved Sum of all LTC (7-F and 7-FN) in Real-Time can be smaller than the flowgate limit – Only the over-allocated entities/transactions are penalized for over- allocating Remaining of flowgate limit can be reassigned to over- allocated entities/transactions so that LTC equals the flowgate limit – Reduces the FTC bucket size – Distribution Proportion Options: FIRM limits of over-allocated entities/transactions Real-Time over-allocation impact Real-Time impacts Other – If TLR-5 cannot be resolved with curtailments from FTC bucket, may need to curtail pro-rata the LTC bucket Entities/Transaction that do not over-allocate may be curtailed (see next examples)

7 FTC and LTC Calculations with Reassignment Total RT Impact < Flowgate limit – Reassign all FTC to LTC TLR 5a requires curtailment of 10 MW of FIRM transactions after exhausting all NON-FIRM curtailments – 10 MW of relief will be provided pro-rata from 790 MW of LTC (7-F and 7-FN), using the existing TLR pro-rata formulas – All impacting GTL and PTP are curtailed, even for entities where RT firm GTL and PTP are below the allocation EntityLast to Cut 7F+7FN 7FCN FTC GTL 7FC FTC PTP Reassigned LTC 7F+7FN 7F+7FN Curtailment A Pro-rata between firm GTL and PTP for all entities B20000 C8000 D27000 E Total


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