American Transmission Co.

Helping to keep the lights on, businesses running and communities strong. ®

Delivering renewable energy

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.

Power lines bring renewable energy into communities

Demand for renewable power is growing. Recent policy changes have required utilities to produce or purchase a greater portion of their electricity from renewable energy sources. Some of these requirements represent dramatic increases over prior standards and will, by necessity, require expanded transmission line capacity across the Midwest region.

Midwestern states’ renewable electricity requirements

Wisconsin10% by 2015
Illinois25% by 2025
Minnesota25% by 2025
Missouri15% by 2021
Iowa105 megawatts

Renewable mandates are significant

Wind power in particular has experienced phenomenal growth, increasing from 2,200 megawatts in 1999 to more than 60,000 megawatts in 2012. Nonetheless, wind still represents less than 4 percent of all U.S. power generation. Biomass generation nationally is smaller at less than 2 percent. Regionally and nationally, coal remains the most common electricity-generating fuel; in 2012, 37 percent of the nation’s electricity supply was generated by coal.

Wind energy projects in Wisconsin

WInd farms in ATC service areaDespite Wisconsin’s lower wind speeds, many developers using today’s advances in technology are able to efficiently harness Wisconsin’s winds. This has enabled ATC to put more than 4600 megawatts of wind on the wires – enough to power approximately 165,000 homes. Additionally, more than 600 megawatts of wind projects are under study in the ATC service area.

ATC supports development of all types of generation.