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Agency Models Transmission Arrangements for Distributed Generation - - PowerPoint PPT Presentation
Agency Models Transmission Arrangements for Distributed Generation - - PowerPoint PPT Presentation
Agency Models Transmission Arrangements for Distributed Generation Glasgow: 26 October 2006 Structure Review Agency Model Options Focus on Gross Nodal Supplier Agency Model Review issues raised For NGET Issues raised in TADG
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What do we mean by “Agency”?
‘business or service authorised to act for others ‘ Single point of contact / interface Aggregator of capacity and energy Controller of despatch Who? Options:
DNOs– DNO Agency Supplier interface – Supplier Agency
The current model is an agent model
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Flavours of agency
Gross vs. Net
“Gross” for most cost reflective charging of
transmission costs
Nodal vs. Zonal
Operational requirement is nodal GNSAM - Charging arrangements is a zonal
tariffs, but nodal charge
DNO vs. Supplier
Supplier least change commercially An operational interface with the DNO
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Agency Model Matrix
Gross of Gross of Net of Net of GSP GSP Group GSP GSP Group
Supplier Agency DNO Agency
“TODAY” (sort of)
Very Difficult, SVA at GSP Group level, Would need to Re-register 23m meters “Interconnector model” Possible, but involves a lot
- f change
GNSAM
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Gross Nodal Supplier Agency Model (GNSAM)
GSP GSP GSP GROUP EG D D EG Distribution Network Transmission Network
NHHd2 HHd1 HHg1 HHg2 NHHd1 HHg2
M1 M2 Today GNSAM
Netted off
HH £/kW Zonal Dem Tariff NHH p/kWh Zonal Dem Tariff
∑HHd
+ ∑NHHd
HH £/kW Zonal Dem Tariff NHH p/kWh Zonal Dem Tariff
For a Supplier, Each embedded generator above a given threshold might be offered to the SO as a single BMU
HHg1
£/kW Gen TNUoS Tariff
Generation BMU
Demand
Generation BMU +
Generation
£/kW Gen TNUoS Tariff £/kW Gen TNUoS Tariff
TEC
HHg2
£/kW Gen TNUoS Tariff
+
TEC ∑HHd - ∑HHg+ ∑NHHd
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GSNAM with consolidation
GSP GSP GSP GROUP EG D D EG Distribution Network Transmission Network
NHHd2 HHd1 HHg1 HHg2 NHHd1 HHg2
M1 M2 EG
HHg1 HHg3
EG ∑HHd
+ ∑NHHd
HH £/kW Zonal Dem Tariff NHH p/kWh Zonal Dem Tariff
HHg1
£/kW Gen TNUoS Tariff
Demand
Generation BMU +
Generation
£/kW Gen TNUoS Tariff
TEC
HHg3
+
HHg2 HHg4
£/kW Gen TNUoS Tariff
TEC
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NGET issues (1)
Investment planning
All generation impacts on transmission Investment is driven by change No access product - clarity required Queue avoidance
Locational signals
Current signal perceived as not cost reflective Strong incentive to embed Size of ‘benefit’ is largely arbitrary Position forecast to worsen
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NGET issues (2)
Operational
Nodal control required Access to services
Specific issues in Scotland
Nature of transmission Small generators discount, C13 Efficient Interface Minimise interfaces where ever practicable
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Industry issues (1)
Why do we need to change? Cost benefit required for any change Scope of change Impact on new and existing parties Interaction with Distribution Arrangements Subjectivity of a de-minimis level Over burdensome relationship with GBSO
Requirement to be party to industry codes Cap97 / LEEMPS
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Industry issues (2)
Clarification of rights
Who should have them Gross / net TEC / DEC
Nature of agreement with NGET
BEGA / BELLA / BCA / DNO exit
Double accounting GB queue Embedded generation is it negative
demand?
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How an Agency model addresses the issues (1)
Firstly, need to accept a need for change
- change needs to be beneficial
- There may need to be changes to other arrangements
Different flavours address different issues
- NGET believes GNSAM is balanced approach
An agency model provides the most efficient interface Supplier agency model draws largely upon existing
arrangements
Agency model allows a level of aggregation Cost reflective transmission signals for all generation
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How an Agency model addresses the issues (2)
Agency model can address de-minimis issue
- Nodal Net
- Gross at lower level (HH)
Codification of access rights and obligations Clarifies GB queue arrangements
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