The UK electricity market, regulated by Ofgem, is split into four phases: Generation, Transmission, Distribution and Supply. The Distribution system connects the transmission system to the consumers within a region. IDNOs are networks embedded within the distribution system that own the ‘last mile’ of cable within a new development.
Four phases of the UK electricity market

IDNOs are then responsible for the operation, maintenance, control, security and integrity of their own networks. Consumers connected to an IDNO network will have the same rights to choose a supplier of their choice as they would if connected to a DNO network.

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