- I estimate that just one bus from a company like Citylink travelling roughly 500 kilometres a day would burn €180,000 worth of diesel a year at today's market value (37 litres per 100km). Granted they get wholesale prices but the discount probably wouldn't be that great. Plus I anticipate that wholesale prices will match the current market value quite quickly as the price continues to rise.
The same mileage would cost €12,600 at ten cent per kilowatt if the bus was electric - assuming that there is a lower commercial electricity rate. If not it would be roughly twice that at the domestic non-night saver tariff.
I'd imagine that such a bus would need one megawatt of battery for a 1,000 kilometre range. Thunder Sky quotes 70kw per 100 kilometres for their 40-something-seater electric bus. A 350/400 kilowatt motor would be required - reliability being the operative word.
Basically, if they could produce a kilowatt of lithium NMC for €500 this should be enough to make it practical. €800,000 per bus with modifications and additional spares for refitting.
It could be modified further with highly insulated walls, roof and windows to reduce energy consumption (up to 30 kilowatts/hour I believe) on heating/cooling. The roof could also be lined with solar panels to power the heating/cooling (damn the proper name for this eludes me).
The estimated 6,000kg of battery should be easy enough to carry. 500 hundred litre tanks of diesel would be 500kg. I'm not sure about the engine perhaps it would save another 900kg (12 litre). That's just 4.6 tonnes of additional weight.
If the battery could last ten years (it should as it is only being discharged half-way) than it would be a prudent investment. Over such a time period a normal diesel bus would burn €1.8 million worth of fuel. That leaves a saving of over €800,000 per bus. This also doesn't include the maintenance costs associated with the upkeep of ICEs. For a company with an electric fleet the savings are enormous. If NMC batteries could last longer than ten years the savings will be even greater.
Anyway something to ponder for a more efficient, less-polluted future.
I am going to write a piece on this and the transition to electric transport but I would appreciate if any holes can be picked out.