An Auwahi Wind turbine generates energy for Maui Electric Co.’s grid at Ulupalakua Ranch land in this undated photo. The tower is 262 feet high and weighs 283 tons. Each blade is 166 feet long. A new turbine tower, generator and blades will be delivered to the site Tuesday. It will replace one damaged in October 2016. -- Auwahi Wind photo

Eight trucks carrying Auwahi Wind turbine components will be on Maui roads Monday and Tuesday, and motorists should expect traffic delays along the route in Central and South Maui and Upcountry, according to officials with Sempra Renewables, which operates the wind farm on Ulupalakua Ranch land.

The trucks will carry tower sections, blades and a nacelle, officials said in a highway advisory for motorists. The parts are scheduled to arrive at Kahului Harbor at 4 p.m. Sunday, said Lisa Briggs, manager of government and community affairs for Sempra Renewables.

“This will allow time to prepare for unloading” on Monday morning, she said.

Plans call for unloading the blades in the morning and the tower components in the afternoon.

The parts are to replace Auwahi’s turbine No. 4, which crashed to the ground on Oct. 2, 2016. Since then, the wind farm has been operating with seven of its eight turbines.

The trucks are scheduled to leave Kahului Harbor after 6:30 p.m. Monday, travel along Maui Veterans (formerly Mokulele) Highway to Piilani Highway. From there, the convoy will continue through Wailea and Makena between 7:30 and 10 p.m.

“The plan is to arrive at Wailea Ike Drive by 7:30 and move through Wailea and Makena ensuring that we will complete the route to the base of Papaka (Road) before 10 p.m.,” Briggs said.

Once it’s light on Tuesday, the trucks will travel up the privately owned Papaka Road, aiming to reach upper Piilani Highway, near Milepost 16, around 7:30 a.m., she said. The plan is to have the wind turbine parts delivered to the Auwahi Wind site at Milepost 20 before 6:30 p.m.

Intermittent road closures can be expected.

The wind turbine has eight parts — three blades, three tower sections, the nacelle and a hub, Briggs said.

It is the same turbine model and has the same performance characteristics as the other seven Siemens-manufactured turbines at the 21-megawatt wind energy farm in Ulupalakua, she said.

An investigation of the October 2016 incident showed that the nacelle on turbine No. 4 detached because of a failure of the yaw bolts that secure the nacelle to the tower.

“Immediately following the incident, all turbines at Auwahi Wind were shut down so inspections could be completed,” according to an informational flyer on the turbine replacement from Sempra Renewables. “When the root cause of the failure was determined, all bolts that fasten the nacelle to the tower for each turbine were replaced, and new inspection procedures were introduced.”

There were no injuries, and damage was limited to the single turbine.

The remaining seven turbines were gradually brought back into service. Maui Electric reported Auwahi returned to providing power to the island’s grid on Oct. 14, 2016. No grid disruptions were reported.

Even with one of Auwahi’s generators out of service, the site was able to produce about 77,000 megawatt hours of electricity last year, enough to power 13,000 homes, Briggs said.

From January through August 2016, Auwahi produced 56,369 megawatt hours of power, with MECO accepting 55,525 Mwh, according to filings with the state Public Utilities Commission.

In 2015, Auwahi produced 91,155 Mwh of wind-generated power.

Each tower at the wind farm is 262 feet high. Each weighs 283 tons, with the power-generating nacelle alone weighing 82.5 tons. The blades are 166 feet long.

The Auwahi Wind farm is on 68 acres of Ulupalakua Ranch land.

The project went online in December 2012.