US-based energy firm MidAmerican Energy has awarded a long-term service and maintenance contract to Siemens for 958 SWT-2.3 turbines at 12 wind projects in Iowa.
The 12 wind projects are expected to power around 665,000 average homes in the US.
Under the deal, Siemens will offer service and maintenance for eight MidAmerican Energy wind projects for around ten years. It will also be responsible for four other MidAmerican Energy projects, once those come into operation during the agreement term.
The service contract for onshore wind facilities is the largest for Siemens globally, the company said in a statement.
Siemens power generation services president and CEO Randy Zwirn said: "With nearly 30% of Iowa's electricity generated by wind energy, the continued reliable energy production coming from this technology is of critical importance to power consumers across the state.
"We look forward to providing our service and maintenance solutions to MidAmerican Energy to help ensure the optimal performance of these wind projects in Iowa over the next ten years."
The German firm offers service and maintenance to over 3,100 installed wind turbines in the Americas region and over 7,600 turbines globally. Combined, these generates around 18GW of clean energy.