MidAmerican Energy Holdings, a unit of Warren Buffett’s Berkshire Hathaway, has agreed to buy nearly 450 2.3-megawatt wind turbines – with an estimated collective value of over $1 billion – from Siemens. “MidAmerican is expanding in wind as costs fall.” [Bloomberg]

China’s move to tackle air pollution could push major Australian coal mining operations from profit to loss, according to a report. New Australian mines will make significant additions to global supply, and “half of Australia’s coal mines lose money when coal prices fall below $96 a tonne, the reports states”. [Quartz]

A group of five Senate Democrats are pressing Interior Secretary Sally Jewell to temporarily halt new Arctic leasing and oil exploration pending “a thorough evaluation of current drilling regulations”. [The Hill]