Arriva has purchased 51 new electric double-decker buses from Volvo Buses. The battery-electric buses, which are based on the BZL Electric chassis, will be delivered in 2025 and used on the 243 and 341 routes operated by Transport for London in the British capital.
I would argue it is best remedied by transit signal priority (rarely wait for lights) and dedicated bus lanes where required (maybe even only needed during rush hours).