Amager Bakke

Amager Bakke (Amager Hill), also known as Amager Slope or Copenhill, is a combined heat and power waste-to-energy plant and sports facility in Amager, Copenhagen, Denmark. It opened in 2017, and partially replaced the nearby old incineration plant in Amager, which is in the process of being converted from coal to biomass (expected finished 2020). The two plants play a major role in Copenhagen's ambitions of being zero carbon by 2025.
Construction and technicalities.
The plant opened on 30 March 2017. It is estimated to cost $670 million, and is expected to burn 400,000 tons of municipal solid waste annually. It also houses a sports facility designed by Bjarke Ingels Group with an tall sloped roof that doubles as year-round artificial ski slope, hiking slope and climbing wall, which opened to the public October 4–6, 2019. The climbing wall, manufactured by Walltopia, is the world's tallest climbing wall at 85 meters. 
Technically, the plant is designed to change between operating modes, producing 0-63 MW electricity and 157-247 MW district heating, depending on the local heat demand and power price. It produces more clean water than it uses. Because of filtration and other technologies, sulphur emission is expected to be reduced by 99.5% and NOx by about 95% as well as dioxins and HCl and it is claimed to be the cleanest incineration plant in the world.
A special feature of this facility will be that the chimney is intended to not emit its exhaust continuously, but instead in the form of "smoke" rings (consisting of water vapour rather than actual smoke).
Operational history.
On September 7, 2018 all waste treatment and energy production was stopped for 17 days to fix a design flaw in the compensators of the low pressure steam system.