Competition has been heating up in the domestic market for electric vehicles and many automakers have been prioritizing the technology since Mitsubishi Motors Corp. launched an egg-shaped electric minivehicle in July.

Domestic carmakers are planning to exhibit various electric concept cars at the Tokyo Motor Show that opens to the public Oct. 24. The models may give us a clue about what will become available to consumers in the near future.

But are electric vehicles really the answer to global warming? Some critics even say that without any major technical breakthroughs, EVs will remain only a niche market.