Green demand: An employee at a solar panel and equipment factory in China.The biggest contribution to electricity generation from renewables globally will come from solar and wind. — AP PARIS: Demand for renewables is set to increase in all key sectors in 2021 and China, which “alone accounts for about half of the increase in global renewable electricity generation, ” plays a critical role, according to chief of the International Energy Agency (IEA). “We expect this year the share of renewables in the world electricity generation comes to 30%, the highest in the history. This is mainly the result of the achievements in a few countries but China plays a critical role, ” Fatih Birol said in an interview with Xinhua.