Three massive electric generators are scheduled to make the slow journey from the Union Pacific rail yard adjacent near Eighth and Vine streets to the Goodman Energy Center beginning Friday.

The first 150-ton generator is schedule to start moving north on Vine shortly after 8 a.m. Additional trips will be made Saturday and Sunday mornings.

Pilot vehicles will guide the generators up Vine Street, turning west on 27th Street. Ultimately, the generators then will head north on U.S. Highway 183 Bypass, crossing the Interstate 70 bridge and continuing north on 230th Avenue to the Goodman Center.

Midwest Energy crews will raise power lines where needed along the route, to allow the generators to safely pass underneath.

Midwest Energy is urging motorists to exercise extreme caution or consider alternate routes. The convoy will move at speeds just slightly faster than walking speed.

The generators were manufactured in Europe by Finnish engine maker Wartsila. They arrived at the Port of Houston earlier this month and traveled to Hays on rail cars. Valued at nearly $5 million each, they are the centerpiece of the $30 million expansion at the Goodman Energy Center north of Hays, which will see the plantís capacity grow from 76 megawatts to 102 megawatts, enough to power more than 15,000 homes.

The expansion should be complete and operational in early 2016