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{{more citations needed|date=September 2013}}
A '''distribution network operator''' (DNO), also known as a '''distribution system operator''' (DSO), is a company which operates the [[electric power distribution]] system which delivers electricity to end users. In many countries, the distribution network operators are separate from the operator of the [[electric power transmission]] system, which transports power in bulk around the country.
'''Distribution network operators''' (DNOs) are companies licensed to distribute electricity in [[Great Britain]] by the [[Office of Gas and Electricity Markets]].▼
== Great Britain ==
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There are fourteen licensed geographically defined areas, based on the former [[area electricity board]] boundaries, where the distribution network operator distributes electricity from the [[National Grid (Great Britain)|transmission grid]] to homes and businesses. Under the [[Utilities Act 2000]] they are prevented from supplying electricity; this is done by a separate electricity supply company, chosen by the consumer, who makes use of the distribution network.
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Distribution network operators are also responsible for allocating the core [[Meter Point Administration Number]] used to identify individual supply points in their respective areas, as well as operating and administering a Meter Point Administration System that manages the details relating to each supply point. These systems then populate ECOES (Electricity Central Online Enquiry Service), the central online database of electricity supply points. Their [[trade association]] is the Energy Networks Association.
=== History ===
[[File:Distribution Network Operators.PNG|220px|thumb|Map of DNO licence areas, coloured by company group]]
In 1990, the area boards were replaced by [[regional electricity company|regional electricity companies]], which were then privatised. The distribution network operators are the successors to the distribution arms of the regional electricity companies. The distribution network operators have a trade association called the [[Energy Networks Association (United Kingdom)|Energy Networks Association]]
At September 2013, six company groups hold the fourteen distribution licences:<ref name="ofgem-dno">{{
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===IDNOs===
In addition to the distribution network operators noted above who are licensed for a specific geographic area there are also independent distribution network operators (IDNO). IDNOs own and operate electricity distribution networks which will predominantly be network extensions connected to the existing distribution network, e.g. to serve new housing developments.
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===Building network operators<span class="anchor" id="BNOs"></span><span class="anchor" id="BNO"></span>===
A further, smaller level of distribution is the building network operator (BNO), usually a company employed by the building owner, in a large building with many meters, such as a block of private flats.
In this case the DNO may act as BNO and its responsibility may include the sub-mains to the individual flats, or DNO responsibility may end at the first incomer, in which case the independent BNO is responsible for the secure distribution cabling 'laterals' between that point and the individual fuses and meters.
This arrangement is a relatively new development, historically such cabling would have been maintained and sealed by electricity boards that preceded the DNOs, and different DNOs supplying buildings of different sizes and conditions, may choose to adopt the wiring in the building or to insist that an independent BNO is appointed.<ref>http://library.ukpowernetworks.co.uk/library/en/g81/Design_and_Planning/Planning_and_Design/Documents/EDS+08-0118+Multi-Occupied+Building+Supplies.pdf {{Dead link|date=February 2022}}</ref> Unlike a DNO or an IDNO, BNOs may be exempted from any licensing requirement by schedules 2 and 3 of The Electricity (Class Exemptions from the Requirement for a Licence) Order 2001<ref>{{
and this allows those responsible for the building network (such as a housing association) to employ any suitable electrical contractor on an ad-hoc basis.
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