The green electricity initiative, facilitated by Tianjin's rapid renewable expansion, represents a milestone, according to State Grid Tianjin Electric Power Company.

"This 800,000-kWh transaction equals saving 300 tons of coal," said Meng Wei, deputy director of the Tianjin Green Power Certificate Service Center, adding that regional green electricity transactions surged 112 percent year-on-year to 15.46 billion kWh by May.