on our own, all the major players will be out there with us in fuel cells,” said Lentz.

Meantime, the emphasis on petrol-electric hybrids coincides with Toyota’s development of a semiconductor that could improve fuel efficiency in hybrid cars like the Prius by up to 10 per cent.

It says early trials show a 5 per cent improvement. The semiconductor –developed with Japan’s Denso Corporation, Toyota’s largest supplier – is made of a more energy-efficient silicon-carbide instead of the traditional silicon. Semiconductors sit within the power control unit (PCU) and manage the flow of electricity between a hybrid vehicle’s battery, motor and generator. But they currently account for 20 per cent of all the energy lost in hybrid vehicles. Toyota says the new semiconductors use only a tenth of the energy of the current power-hungry PCU chips.