Next Generation Hybrid Bus (NexGenHyBus)

A bus that recycles its own braking energy to help power its air conditioning and electric systems is about to get a smarter, cheaper upgrade. NexGenHyBus will add a mild drive-assist to Wrightbus’s existing micro-hybrid architecture—without the cost and complexity of a full high-voltage hybrid system. Current micro-hybrid buses already capture braking energy, but they use it only for ancillary loads like lights and pumps, not to help the bus move. This project fills the gap between those low-cost systems and expensive full hybrids. By adding a dual battery system and electrically driven compressors for air conditioning, the team aims to deliver fuel savings at a fraction of the cost. If successful, the technology could cut fuel consumption across bus fleets without requiring new vehicle platforms or high-voltage infrastructure. That matters because buses are a backbone of urban transport, and their fuel use—especially when idling with air conditioning running—is a major operating cost for cities. The project includes real-world trials with Go-Ahead Group, so the results will be tested under actual passenger service conditions.