CIRED 2011RT 5b

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CIRED 2011RT 5b

• TSO-DSO co-ordination of planning for wind
  connections

Tony Hearne Manager, Renewable Planning ESB
Networks
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Topics

• Utility Landscape in Ireland
• Wind situation in Ireland
• Group processing
• Gate 3
• Conclusions

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Topics

• Utility Landscape in Ireland
• Wind situation in Ireland
• Group processing
• Gate 3
• Conclusions

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Main Players in Ireland

• Regulator
• Transmission System Operator
• Transmission System Planner
• Distribution System Operator
• Distribution System Planner
• Transmission and Distribution Asset owner

• CER
• EirGrid
• EirGrid
• ESB Networks
• ESB Networks
• ESB

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System Operator Structures
ESB Group Generation- Customer supply Consultancy

• Eirgrid PLC
• TSO
• Plan Tx network
• Contol access to Tx network
• Operate Tx network
• SEMO
• Operate wholsale energy market

• ESB Networks Ltd
• TAO
• DAO
• DSO

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Transmission
Distribution
MV 20 kV 10 kV
LV 400 230 V
220kV 400kV
400kV
220kV
110kV
110kV
38kV
20kV 10kV

• Transmission
• 6,300 km of Overhead Network
• 140km of Underground Cables
• 165 HV Stations

• Distribution
• 160,000 km of Lines/Cables
• 630 HV Substations
• 230,000 MV Transformers/Units
• 2m meters

1B RAB Value
5B RAB Value
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Topics

• Utility Landscape in Ireland
• Wind situation in Ireland
• Group processing
• Gate 3
• Conclusions

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(No Transcript)
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Wind Connections MW
System Demand 2020
3990
1460 MW
c1250
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History to date

• Up to 2003 applications for connection of wind to
  both System Operators were processed sequentially
• Since 2004, following a moratorium on wind
  connections, such is the volume of applications
  in the queue, that a Group Processing Approach
  GPA was the only practical way forward.
• They are now processed in batches known as Gates

Gate Size MW Year Take up of offers
1 370 2005 100
2 1385 2007 100
3 3900 2011 Offers issue nearing completion
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Connected Blue
In Progress Red
Being Quoted Green
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Topics

• Utility Landscape in Ireland
• Wind situation in Ireland
• Group processing
• Gate 3
• Conclusions

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Example of Sequential Approach
MV
38kV
38kV/MV Stn
38kV
38kV
110/38kV Stn
38kV/MV Stn
110kV
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Example of Sequential Approach
MV
?
38kV
38kV/MV Stn
38kV
38kV
110/38kV Stn
38kV/MV Stn
110kV
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Example of Group Approach
110kV
38kV
38kV
38kV/MV Stn
110/38kV Stn
38kV/MV Stn
110kV
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• Sequential processing
• Large applicants tend to apply to TSO, smaller
  ones to DSO
• The connection method is determined solely on the
  basis of their connection
• Applicants pay for their dedicated works
• Interracting offers can cause withdrawal of
  offers already in train

• Group Processing
• Applications are processed by the SO most suited
  to their Group connection irrespective of which
  SO they originally applied to.
• The connection method is determined by the Least
  Cost technically Acceptable LCTA method for the
  defined sub-group
• Applicants pay in full for their dedicated
  shallow works and a per MW share of shared
  shallow works
• No Interaction issues within Gates

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General operation of a Gate

• Regulator with input from both System Operators
  and wind industry determine criteria for
  eligibility for inclusion of Gate
• TSO and DSO jointly apply criteria to the Queue
  of application
• Queue comprises both DSO and TSO applicants
• Result Make up of Gate is determined

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Gate 1 vs Gate 2

• Gate 1 370MW purely date order
• Gate 2
• Date order plus element of System optimisation
• First 500MW in Queue driver
• Applications that share a LCTA shallow connection
  with driver
• Extensions to existing installations
• Outliers with interactions lt10MW at 110kV node
• Resulting size circa 1385MW

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Topics

• Utility Landscape in Ireland
• Wind situation in Ireland
• Group processing
• Gate 3
• Conclusions

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Implementation of Gate 3

• The implementation of Gate 3 required very close
  collaboration between CER, TSO and DSO.
• The following slides will endeavour to explain
  the steps, mechanisms and features involved

Network MW Number of Connections
Distribution 1941 127
Transmission 2050 28
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Size of Gate 3
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1 Eligibility criterion

• Full consultation held with industry and
  stakeholders
• Result Date order of applications the clear
  preference from the wind industry
• CER Direction issued to System Operators
  including MW size of the Gate
• Implementation commences
• Unified queue formed by combining separate SO
  queues
• Cut-off criterion applied

In
Out
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What next?

• Now we know who is in and out!
• To begin their studies, TSO need to know how much
  generation will present at their transmission
  nodes
• In order to inform this, DSO would normally carry
  out full studies on the smaller applicants to
  determine which transmission node
• To shorten timeframe as much as possible it was
  necessary to frontload the node assignments

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2 Node Assignments
Application Capacity Node Rule
Less than 5 MW Nearest 38 kV
5 MW 10 MW Nearest 38 kV or 110 kV
10 MW 40 MW Nearest 110 kV
40 MW 177 MW New 110 kV
Greater than 177 MW New 220 kV or 400 kV

• Banded rule-set devised based upon distance to
  nearest distribution primary sub-station
• Clauses put in place to define nearest
• Result Transmission sub-groups formed

Tx Node 1
Tx Node 2
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Gate 3 General TSO-DSO Process
TSO
Issue Tx offers
DSO and TSO
Tx SC and other studies
Establish Tx Firm Access Quantities
Node Assignment
Report to TSO
Connection Agreement
DSO
Determine Distribution connection methods
Issue DSO offers
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Transmission Firm access quantities

• Transmission System Operator calculates
  additional capacity available at each node for
  each future year.
• Available capacity allocated based on application
  date-order
• Each Gate 3 application will have a Scheduled
  Firm Access Quantity for each year from 2010 to
  2025, taking account of grid reinforcements and
  other new generation
• Thus, transmission reinforcement based on
  approved development strategy leads the wind
  generation connections.

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Grid development strategy to 2025

• Takes account of
• demand growth
• renewable generation to meet targets
• conventional generation development
• future DC interconnections with UK or Europe.
• Will require
• 1,150 km new transmission
• 2,300 km upgrades

http//www.eirgridprojects.com/
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Project Planning

• Country divided in to Areas for transmission
  study purposes
• Detailed offer issuance Project Plan agreed
  between TSO, DSO and CER.
• Project Plan published

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Communications

• Gate 3 Liaison Group meeting
• chaired by Regulator
• Attended by both SO s and representatives of all
  industry stakeholders
• SOs report on progress per workplan
• Other issues discussed as they emerge
• Customer connection meetings
• Held once distribution connection methods signed
  off
• TSO-DSO bi-lateral meetings
• Held bi-monthly or weekly

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Questions ?

• Tony.hearne_at_esb.ie

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Conclusions

• The circumstances in Ireland lend themselves to
  the TSO-DSO-Regulator approach outlined above
• Facilitates large quantities of Renewable Energy
  being processed in a structured manner
• Transmission and Distribution systems developed
  in co-ordinated fashion
• Certainty of offer issuance to those in the Gate
• Rationalises the allocation of scarce capacity