British Gas, with British nationality, was founded in 1997, known as the leading business energy supplier, with the market share of nearly 5 million commercial electricity and gas customers throughout the UK.  
With the emerging equally potential energy suppliers, it's market share has gone down by 20% in the past 5 years. Still, they have managed to somehow maintain their prepotent position by targeting customers with multiple sites and giving them special discounts on electricity and gas tariffs. British gas has fixed-price energy plans of 1, 2 and 3 years for their commercial customers.