WEC's scenario-based report, The Grand Transition, developed with Accenture Strategy and the Paul Scherrer Institute, sees wind and solar rising from accounting for 4% of power generation, to between 20-39% in the next 35 years, while gas, oil and coal together falls to as low as 50% of the global energy mix.

Behind the transformative swing in power generation supply will be another first, the report's authors suggest: per capita energy demand is expected to peak "before 2030", in stark contrast to the more than doubling of energy since 1970.

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