Siemens Gamesa Renewable Energy (SGRE) has landed an order for 21 of its SG4.5-145 turbines for MidAmerican Energy’s 95MW Southern Hills Expansion wind power project in Iowa, widening the OEM’s lead in the prospective 4.2MW-4.8MW market segment in the US.

The OEM says the 145-metre-diameter rotor machines will operate at a 4.8MW rating – by far the highest for any turbine owned by MidAmerican, one of several electric utilities in Warren Buffett’s Berkshire Hathaway Energy.