Phoenix Taxis based in Blyth boasts 26 pure-electric Nissan LEAFs which it has built up since the first cab was purchased in 2012.
The company is now celebrating after its fleet of LEAFs – which cost an average of just 2p a mile to run – have passed the 500,000-mile mark.
It comes as figures reveal that nationally Nissan electric taxis have travelled more than three million miles since they were first introduced.
Alex Hurst, managing director at Phoenix Taxis, said: “We spotted the potential in the LEAF all those years ago and we’re now reaping the rewards.
“Our fuel bill is significantly lower than other taxi companies who still run traditional diesel-powered vehicles.
“We’ve just launched a brand new taxi system and app which allows customers to select a LEAF over a standard taxi.
“We’re now looking at introducing 10 more to our fleet such is the demand for electric taxis.”
The fleet of LEAFs is supported by a dedicated network of rapid chargers at Phoenix’s headquarters that can charge the vehicles from zero to 80% in as little as half an hour.
Following the success of the LEAF, Phoenix is now expanding its electric taxis into Durham.