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6. Viridian Group Investment

  • Chief executive: Ian Thom
  • Pre-tax profits: £50.4m
  • Employment: 491
  • Paybill: £22m

Viridian is one of the biggest energy companies in Northern Ireland and the Republic. It is part of I Squared Capital after its sale by former owners Arcapita.

Viridian consists of Power NI, the supplier of electricity to around 600,000 homes in Northern Ireland. Its power procurement business manages around 600 MW of contracted generation capacity here. Viridian also owns Energia Group, an all-island energy business, which recently unveiled five new windfarms across counties Tyrone and Antrim.