Although he refuses to reveal figures, Mr Ghosn says the cost per kilowatt-hour (kWh) of battery capacity for Renault-Nissan cars has fallen by half in four years.

ECONOMIST: Electric cars

According to Bosch's calculations, a conventional internal-combustion-engined car can travel 1.5-2.5km on a kilowatt-hour (kWh) of energy.

ECONOMIST: The electrification of motoring

It is now 68 cents per kilowatt-hour, or roughly 14 times what it costs to make a kwh from coal.

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