Beijing, Nov. 18 -- As northern China slips into the winter chill, many residents may be unaware of the quiet shift in the energy sources now heating their homes.

Since November, centralised heating for 30 million square meters of indoor space in the city of Jinan, capital of east China's Shandong Province, has been powered by industrial waste heat recycled from two thermal power plants located more than 100 km away.

Designed with four relay pumping stations and pipelines, the hot steam generated by the power plants is pushed into the heating system in the urban area of Jinan.

By the end of this year, the new energy will supply heating for 100 million square meters of indoor space in Jinan. It is estimated that each heating season, the n...