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Appendix A: Asset Types, Groups and Subgroups for Electricity Line Businesses


This Document is Archived


Handbook for Optimised Deprival Valuation of System Fixed Assets of Electricity Line Businesses [2000]

Energy Markets Regulation Unit
[ Last Updated 24 December 2007 ]


Asset registers should include, as a minimum, the classification of assets as set out in this appendix.

Transpower

(a) AC Transmission Lines

Transmission lines should be divided into subgroups by voltage: e.g. 50kV, 66kV, 110kV and 220kV.

Further subdivision should be by conductor size.

For standard valuation purposes the unit is 1km.

(b) Benmore-Haywards HVDC Link

The Benmore-Haywards HVDC link including land and buildings should be recorded.

(c) AC Substation Equipment

Substations should be divided into subgroups as follows:

Category Average No. of Incoming HV bays
Major 14
Medium 8
Small 6
Rural 2

Transpower and Local ELBs

(d) Subtransmission

Subtransmission Lines

Subtransmission lines should be divided into subgroups by voltage: e.g. 11kV, 22kV, 33kV.

Further subdivision should be by conductor size (e.g. 185mm2 aluminium, 100mm2 aluminium).

For standard valuation purposes the unit is 1km.

Subtransmission Cables

Subtransmission cables should be divided into subgroups by voltage e.g. 11kV, 22kV, 33kV. If cable sizes differ markedly within an ELB, the quantities should be recorded separately for ranges of capacity.

For standard valuation purposes the unit is 1 km.

(e) Zone Substations

Zone substations should be divided into subgroups by capacity: 0-5MVA, 6-10MVA, 11-20 MVA, 21-30MVA, over 30MVA.

Numbers of substations should be determined separately for the asset categories identified in Table B.1 of Appendix B.

Equipment owned at associated points of supply should be listed under this section e.g. circuit breakers, metering and communications equipment.

Ripple injection equipment should be included under this class of asset and will incorporate control equipment, tuned circuit, coupling equipment and remote units. The master station should be included separately with the system control facilities.

For standard valuation purposes the unit is one substation.

(f) Distribution Lines and Cables

Distribution Lines

Distribution lines should be divided into subgroups by voltage, conductor size ranges and type:

  1. 6.6kV, 11kV and 22kV
  2. (150mm2 to 300mm2 Al incl) etc aluminum or equivalent
  3. 3 phase, single phase, SWER
  4. lines with more than one voltage.

For standard valuation purposes the unit is 1 km.

Distribution Cables

Distribution cables should be divided into subtypes by voltage: 6.6kV, 11kV and 22kV.

If necessary, they should also be divided by conductor size.

For standard valuation purposes the unit is 1km.

(g) Distribution Switchgear

Distribution switchgear should be divided into subgroups by type. Voltage regulators are to be included in this group.

(h) Distribution Substations

Distribution substations should be divided into subgroups: pole mounted, ground mounted (covered), indoor (kiosk) or on customers' premises.

Consumer substations with the substation sited in a customer's premises should be treated as a subgroup.

For standard valuation purposes the unit is one substation.

(i) Distribution Transformers

Distribution transformers should be divided into subgroups by size.

For standard valuation purposes the unit is one transformer.

(j) Reticulation

Low Voltage Lines

It should not be necessary to divide low voltage lines into subgroups by conductor size or according to whether there are one, two or three phases. However, the lines should be divided into subgroups by type: overhead and underbuilt. Streetlighting mains, should be recorded separately.

For standard valuation purposes the unit is 1km.

Low Voltage Cables

It should not be necessary to divide low voltage cables into subgroups by conductor size, Streetlighting mains, should be recorded separately.

For standard valuation purposes the unit is 1km.

(k) Customer Service Connections Excluding Meters and Relays

This class of asset includes cable or line connections from the mains to the property boundaries and includes LV fuses. The assets should be divided into subgroups according to whether they are for one or three phases.

For standard valuation purposes the unit is 1 service.

(l) System Control Facilities

Most local ELBs have only one system control centre which, along with any other system control facilities, should be recorded separately as a master station. Remote units should be recorded with the appropriate zone substation.

(m) Communication Facilities

This class of asset comprises:

  1. terminal facilities: these should be recorded as a group with the master station and the remote units recorded with the zone substation.
    For standard valuation purposes the unit is one terminal.
  2. lines/cables: these should be subgrouped if necessary.
    For standard valuation purposes the unit is 1km.

(n) Miscellaneous Equipment

This class of asset includes items such as air break switches and auto reclosers.

(o) Stores and Spares

The stock of stores and spares should be recorded.

(p) Land

Land owned by ELBs on which substations are built should be recorded.

(q) Easements

Easements which qualify for assessment (see B.29) should be recorded.


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