American Transmission Co. projects

Project website for a Wisconsin-based company that owns and operates the high-voltage electric transmission system that powers communities in portions of the Upper Midwest.

Learning center

Electricity is delivered to homes, schools, hospitals, businesses and industries through an integrated system of generating plants, power lines and substations. Transmission lines, which consist of heavy wires strung between tall structures, carry power from where it is generated to where it is needed.

It’s similar to the interstate highway system, with electricity traveling on transmission system wires like vehicles on the highway.

How Transmission Works

Electricity is generated at various kinds of power plants, wind and solar farms by utilities and independent power producers.


The vital link between power production and power usage, transmission lines carry electricity at high voltages over long distances from power plants to communities. This is what ATC does.


Electricity from transmission lines is reduced to lower voltages at substation. Distribution companies then bring the power to your workplace and home.