What is the fine-grained topic of the following text: Zane Fulljames, CEO of NZ Bus, says that as nearly 82% of New Zealand’s electricity comes from renewable energy sources, transition to electric-powered public transport alongside private vehicles is crucial in reducing the country’s carbon footprint and as owners and operators of fleet, bus companies have a key role to play. Only return the topic.
Transition to electric-powered public transport in New Zealand