PowerOn Midwest | Structures

Structures

The Preferred Solution

PowerOn Midwest was approved by the Midcontinent Independent System Operator (MISO) as part of its long-range transmission planning portfolio—a set of projects designed to address growing demand, relieve congestion, integrate new sources of generation, and improve grid reliability across the region.

Why 765 kV technology?

765 kilovolt (kV) technology was identified in the planning process as the preferred solution for the region, presenting several advantages:

Efficiently carries power over long distances
Fewer transmission lines needed to carry the same amount of power (see diagram)
Fewer structures reduce impact on land, communities, and the environment
Resilient infrastructure that can consistently deliver power
Provides backup power pathways to deliver energy to customers

A comparison of three types of transmission lines. Left - Six 245 kV single-circuit towers next to each other (900 feet of total right-of-way needed). Middle - one 765 kV single-circuit tower (250 feet of total right-of-way needed). Right - three 345 kV double-circuit towers next to each other (450 feet of total right-of-way needed).

A 765 kV transmission line can carry as much power as six 345 kV single circuit lines or three 345 kV double circuit lines.

Not to scale*

Structure types

Transmission structures play a vital role in the delivery of electricity. They support the components that are used to transport electricity. PowerOn Midwest is working with landowners and the community to power our region today and into the future.

Typical 765 kV structures

This is an example of a typical 765 kV structure, similar to what could be used on the project.

Typical dimensions: width: 135-145 ft; height: 150-175 ft; minimum ground clearance: 60-80 ft; span: 1,200-1,400 ft (approx. 5 structures every mile); footprint size: 35x35 ft to 50x50 ft; foundation depth: 25-65 ft; right-of-way width: 250 ft (125 feet each side from the centerline).

Land rights overview

Land rights is the name used for the property rights acquired by the utility used for the construction, operation, and maintenance of a transmission line. Most often, the land rights acquired are easements. An easement allows the utilities the right to construct, operate, and maintain a transmission line and other associated infrastructure on a landowner's property.

Our land rights acquisition process

Project representatives will hold individual meetings with affected landowners to discuss land rights.

Utilities contact landowners to begin the easement discussion.
Easement process is discussed with landowners. An offer is based on current market values (similar properties) and other property specifics.
The utilities work closely with the landowner to resolve concerns and reach agreement. If unable to agree, state law provides for an eminent domain process.
The utilities construct, operate, and maintain the transmission line within the easement.

Download the land rights process factsheet