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Private wire systems are localised electricity grids connected to the local distribution networks but linked to privately-owned central plant which produces electricity. This enables them to operate a stand-alone supply in the event of the national grid failing, providing localised energy security. The business case for private wire supply is driven by the fact that off-grid generation generally avoids network charges and statutory costs. [1] Ofgem's "Significant Code Review" in the UK, launched in August 2017, [2] includes private wire supplies within its scope. [3]