"When the world’s largest floatplane-only airline, Harbour Air, says it is switching to become an electrically powered airline, you know something is going on with the state of aviation battery technology. It starts to make sense to some, at least enough to look into it. And when aviation makes financial sense of electric mobility, it also means the tipping point is near or already reached.

Harbour Air will be the first seafaring airline to convert its complete fleet of de Havilland Beaver, Otter, Twin Otter aircraft and lone Cessna Caravan to electricity. These 41 vintage aircraft will be converted to reach a longer lifecycle with highly improved efficiency and lowered maintenance costs, a win-win for all." https://cleantechnica.com/2019/04/06/how-maritime-harbour-air-is-switching-over-to-100-electric-seaplanes/