Portlethen will soon see a new greener bus on local routes. From time to time Stagecoach will be trying out eco-friendly hybrid-electric buses between Aberdeen and the town.

The fleet of 10 hybrid buses will be mainly operating in Aberdeen from Balnagask to Northfield via Union Square and Aberdeen Royal Infirmary.

However managing director Andrew Jarvis said at the launch on Monday that Stagecoach would also trial the buses on other routes including Aberdeen-Westhill and Aberdeen-Portlethen. The buses are not suitable for longer journeys such as on the A90 dual carriageway to Stonehaven as the maximum speed is 46mph.

Councillor Ian Mollison, who was at the launch at the Ardoe House Hotel in his North Kincardine ward, said: “I am very pleased to hear that these low emission buses will be seen in Portlethen.

“Having now travelled on one, I am sure passengers will welcome the smoother, quieter ride. They are also a welcome contribution to the environment as vehicle emissions cause poor air quality which in turn can damage your health.”

The new hybrid buses produce 30% less carbon emissions than standard vehicles.

Mr Jarvis said: “This is the latest of more than a £3m investment in fleet improvements in the North East in the last year.”

The buses are fuelled by a battery system, supported by a smaller traditional diesel engine, with the braking system generating electrical energy when the brakes are applied. Electrical energy is also stored in the battery pack and used to drive the electric motor. As well as reducing emissions they show substantial fuel savings. The £1.5m investment in the fleet was backed by £1m from the Scottish Government’s green bus fund.

They take over the Hospital Direct 59 route in Aberdeen later this month, running every 10 minutes.