Since 2007, Stagecoach North East have invested heavily in hybrid buses. "Stagecoach in Sunderland" is also home 40 Alexander Dennis Enviro 300 bodied Scania Gas Buses. These are currently the only batch of this type within the Stagecoach group. The vehicles run primarily on routes 3, 12, 13, 16 and 20. "Stagecoach in Newcastle" is served by large fleet of Alexander Dennis Enviro400 double-decker buses including the Enviro400 Hybrid and more recently the Alexander Dennis Enviro400 MMC buses. These double decker buses operate on many of the city's high frequency routes.