In the rolling hills of South Africa’s Mpumalanga province, hundreds of builders, welders and engineers are putting the final touches to a gigantic new power station that’s set to burn as much as 15-million tons of coal a year until it is eventually shuttered in 2073. The 4 800 MW dry-cooled Kusile plant and the almost identical Medupi facility, which was completed last year, will be key to meeting demand for energy in a country that’s been plagued by rolling blackouts since 2008. Environmentalists however caution that their continued operation will be a major impediment to South Africa meeting its commitment to eliminating greenhouse gas emissions on a net basis by 2050.