19. SSE Airtricity (two companies)
- Chief executive: Stephen Wheeler
- Pre-tax profit: £23.8m
- Employment: 177
- Pay bill: £5.2m
SSE is Northern Ireland’s second largest energy utility and a major provider of renewable power.
Its energy supply business, SSE Airtricity, provides greener electricity, natural gas and energy-related services to home and business customers across Northern Ireland.