Oil major Shell has set out ambitions to build a major electricity generating and retailing business in Australia within the next decade as part of its global shift towards lower-carbon energy, in comments that look set to revive speculation that a significant acquisition may be on the cards.

Maarten Wetselaar, the group's global head of gas and new energies, said it would be "an enormously lost opportunity" if Shell didn't get good at supplying low-carbon electricity to consumers and make the most of its famous brand.