The reason why we don’t have electricity driven planes –
A battery is nowhere near as energy-dense as a liquid fuel. Jet fuel, for example, has a specific energy of 11,890 watt-hours per kilogram. Top-tier lithium-ion batteries currently max out around 250 watt-hours per kilogram. That means you’ll need a far heavier amount of batteries to match the distance traveled with conventional aviation fuels.
Why Harbour Air?
But all of Harbour Air’s routes are less than 30 minutes, so there’s plenty of juice in the current and upcoming generation of batteries to meet the demand for these routes, and the planes don’t have to be quick.
Another consideration is that fuel is often the largest single expense for most airlines. Its price is volatile and spikes can hit small airlines especially hard. Electricity prices, on the other hand, are far more stable.