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Transcript of P350: Seasonal Zonal Transmission Losses - ELEXON · Background and context 3 P350: Seasonal Zonal...
P350: Seasonal Zonal Transmission Losses
27 February 2018
David Thomas and Riccardo Lampini
Webinar
Public
What we will cover today
P350: Seasonal Zonal Transmission Losses 2
■ Background and context
■ Timeline for Modification P350 approval
■ TLFs and TLMs: Before and After 1 April 2018
■ How are TLFs calculated?
■ Timetable for TLF creation and publication
■ Where can I find TLF information?
■ Worked examples:
– Delivering BMUs (Generators)
– Offtaking BMUs (Suppliers)
■ Conclusion
■ Questions
Background and context
P350: Seasonal Zonal Transmission Losses 3
■ The CMA mandated the implementation of a Transmission Loss Factor (TLF), for each TLF
Zone1 and BSC Season, on 1 April 2018.
1 TLF Zones are aligned to the existing Grid Supply Point (GSP) Groups across Great Britain
■ As part of the Energy Market Investigation, the Competition and Markets Authority
(CMA) concluded that the absence of locational pricing for transmission losses has an adverse
effect on competition.
■ The CMA stated that this modification to the Balancing and Settlements Code (BSC) be
identical to P229, except for the inclusion of a small number of additional elements that had
emerged since 2010.
■ These elements included:
– Treatment of Interconnectors and High Voltage Direct Current (HVDC) circuits
– National Grid’s rights to ‘step in’ and take over the process if required
– A new TLF Adjustment value to neutralise the impact on certain strike price adjustments by
the Low Carbon Contracts Company (LCCC) for Contracts for Difference (CFD).
Timeline for Modification P350 Approval
P350: Seasonal Zonal Transmission Losses 4
Jul 16 • Modification P350: Introduction of a Seasonal Zonal Transmission Losses scheme’ raised
Sep 16 • P350 Industry Impact Assessment Consultation opened
Oct 16 • P350 Industry Impact Assessment Consultation closed
Jan 17
• The Panel unanimously agreed to approve P350, and submitted to the Report Phase
• The Report Phase Consultation opened
Feb 17
• The Report Phase Consultation closed
• The Panel unanimously recommended P350 be approved
• The Final Modification Report was issued to OFGEM
Mar 17
• OFGEM approve P350: Introduction of a Seasonal Zonal Transmission Losses scheme for implementation on 1 April 2018
TLFs and TLMs – Before and After 1 April 2018
P350: Seasonal Zonal Transmission Losses 5
■ Before 1 April 2018:
– TLF = 0
– TLM values do not change with location; they only
differ by whether the Balancing Mechanism Unit
(BMU) is Delivering or Offtaking
– Delivering BMUs have a TLM below 1, whilst
Offtaking BMUs have a TLM above 1
■ After 1 April 2018:
– TLF and TLM values differ based on location and
whether the BMU is Delivering or Offtaking
– Delivering BMUs still tend to have TLMs below 1,
whilst Offtaking BMUs still tend to have TLMs
above 1
■ Further details can be found on the ELEXON website:
Introduction of a seasonal Zonal Transmission Losses
scheme
How are TLFs calculated?
P350: Seasonal Zonal Transmission Losses 6
BSCCo
CDCA
Transmission Company
Calculate Adjusted Seasonal
Zonal TLFs by Season and Zone
Calculate Seasonal Zonal
TLFs by Season and Zone
Calculate Zonal TLFs by SSP
LFM
Derive Nodal Power Flows
Validate Metered Volumes
Metered vol.
Transmission
Network Data
NMS
LPs and SSPs
Metered vol. and HVDC vol.
Network Data
BSCCo
Nodal power flows
Nodal TLFs, Branch
power flows
Seasonal Zonal
TLFs
Adjusted Seasonal
Zonal TLFs
BSCCo Balancing and Settlement Code Company
CDCA Central Data Collection Agent
DSO Distribution System Operator
HVDC High-Voltage Direct Current
LFM Load Flow Model
LP Load Period
NMS Network Mapping Statement
SSP Sample Settlement Period
TLFA Transmission Loss Factor Agent
TLFA
DSO
Distribution
Network Data
Timetable for TLF creation and publication
P350: Seasonal Zonal Transmission Losses 7
By 30/06
ISG to agree methodology for Load Periods and Sample Settlement Periods calculation
10 WD
Industry consultation on agreed methodology for Load Periods and Sample Settlement Periods calculation
By 31/08
ISG decision on Load Periods and Sample Settlement Periods
Load Periods and Sample Settlement Periods
A proposed reference NMS and methodology presented to Panel
10 WD Industry review of draft reference NMS
By 19/10
Updated draft reference NMS presented to Panel for approval
Network Mapping Statement
Transmission Network Data
Distribution Network Data
Metered Volumes and HVDC Metered Volume
By 30/11
Nodal Power Flows
Branch Power Flows1
Nodal TLFs
Seasonal Zonal TLFs
Adjusted Seasonal Zonal TLFs
From To
BSCCo ISG
BSCCo
BSCCo
BSCCo
BSCCo
TLFA
Industry
ISG TLFA/Industry Panel
Industry
BSCCo
Panel TLFA/Industry TLFA TLFA TLFA
Data type
1 This is called “Load Flow Model Power Flows in the BSC.”
Where can I find TLF information?
P350: Seasonal Zonal Transmission Losses 8
Where TLFA outputs are stored?
Data will be published on the ELEXON Portal www.elexonportal.co.uk/tlfdetermination by the end of December.
Which file I’m more likely to use?
Actual TLFs are saved in the TLFA-I009.
Indicative TLMs and TLMOs have been calculated using historic Metered Volume data for the Reference Year from zero
TLFs (TLFA-I013) and non zero TLFs (TLFA-I014), to give meaningful indicators of Parties’ potential losses allocation.
Where can I find additional information on Code Subsidiary Documents (CSDs) and Configurable Items?
Documents like Service Description or Load Flow Model specifications are published here:
https://www.elexon.co.uk/change/releases/p350-introduction-seasonal-zonal-transmission-losses-scheme/.
The page also contains information on the Estimated Transmission Losses Adjustments (ETLMOs).
Do I need to calculate actual TLMs?
Historic values are published here www.elexonportal.co.uk/historictlmdata.
File structure will be updated to include the additional zone field.
Having actual TLMs and TLFs, actual TLMOs can be derived from the formula TLM = 1 + TLF + TLMO
95.596
96.597
97.598
98.599
99.5100
100.5
48 1 48 1
31/03/2018 01/04/2018 31/03/2018 01/04/2018
T_GEN1 T_GEN2
8 14
MW
h
Sum of Mvol [MWh]
Sum of CEV [MWh]
Worked example – Delivering BMUs (Generators)
P350: Seasonal Zonal Transmission Losses 9
Two Delivering BMUs:
1. T_GEN1 located in Southern England (GSP Group _H, Zone 8); and
2. T_GEN2 in North Scotland (GSP Group _P, Zone 14).
BMU Settlement Day Settlement Period Zone TLF Mvol [MWh] TLM CEV [MWh]
T_GEN1 31/03/2018 48 8 0 100 0.989 98.939
T_GEN1 01/04/2018 1 8 0.007801 100 0.998 99.814
T_GEN2 31/03/2018 48 14 0 100 0.989 98.939
T_GEN2 01/04/2018 1 14 -0.017974 100 0.972 97.236
1
1
1Credited Energy Volume
-102
-101.5
-101
-100.5
-100
-99.5
-99
-98.5
-98
-97.5
48 1 48 1
31/03/2018 01/04/2018 31/03/2018 01/04/2018
2__HSUP1000 2__PSUP2000
8 14
MW
h
Sum of Mvol [MWh]
Sum of CEV [MWh]
Worked example – Offtaking BMUs (Suppliers)
P350: Seasonal Zonal Transmission Losses 10
Two Offtaking BMUs:
1. 2__HSUP1000 located in Southern England (GSP Group _H, Zone 8); and
2. 2__PSUP2000 in North Scotland (GSP Group _P, Zone 14).
BMU Settlement Day Settlement Period Zone TLF Mvol [MWh] TLM CEV [MWh]
2__HSUP1000 31/03/2018 48 8 0 -100 1.012 -101.174
2__HSUP1000 01/04/2018 1 8 0.007801 -100 1.016 -101.599
2__PSUP2000 31/03/2018 48 14 0 -100 1.012 -101.174
2__PSUP2000 01/04/2018 1 14 -0.017974 -100 0.990 -99.022
1
1
1Credited Energy Volume
Conclusion
P350: Seasonal Zonal Transmission Losses 11
■ TLFs are negative in the North and positive in the South because the majority of Generation is in the
North, whilst the majority of Consumption is in the South.
■ If you are a Generator in the North, or a Supplier in the South, you are more likely to be negatively
impacted by P350 as:
– An increase in Generation in the North, or an increase in Consumption in the South, means an
increase in total losses.
■ If you are a Supplier in the North, or a Generator in the South, you are more likely to be positively
impacted by P350 as:
‒ An increase in Consumption in the North, or an increase in Generation in the South, means a
decrease in total losses.