01/03/2026
MORE DETAILS RELEASED ABOUT ELECTRIC TRANSMISSION LINE PROJECT IN SOUTHERN CHAUTAUQUA COUNTY, COWLEY COUNTY; PUBLIC HEARINGS TO BE HELD IN SEDAN, WINFIELD THIS WEEK
A extra high-voltage electric transmission line could be cut through the heart of Chautauqua and Cowley counties if a utility company fulfills its plans.
Evergy is proposing construction of a 133-mile transmission line that would connect an Evergy substation near Garden Plain, Kan., in Sedgwick County with a substation near Delaware, Okla., in Nowata County.
The line will be located in Sedgwick, Sumner, Cowley and Chautauqua counties before entering Oklahoma immediately southwest of Caney, where the line will continue through Washington and Nowata counties. The line will not enter Montgomery County.
The Evergy project is known as the Buffalo Flats project (so named because of the Buffalo Flats substation near Garden Plain). If approved and completed, the project will transmit 354 kilovolts of power to supplement the Southwest Power Pool grid.
The Buffalo Flats project is one leg of a larger transmission project that is intended to solidify power transmission in southern Kansas, northern Oklahoma and southern Missouri. The much-larger project is known as the “Branson 345 kV Overlay,” whereby three separate line projects will collectively enhance the power distribution to the Branson, Mo., region.
The three legs are Garden Plain to Delaware, Delaware to Monett, and Monett to North Branson.
Evergy will be responsible for the 133-mile project on the Kansas portion of the transmission line; American Electric power will be responsible for constructing the line in the Oklahoma portion.
Energy’s application to the Kansas Corporation Commission for the transmission line project calls for a large swath of right-of-way acquisition through southern Chautauqua County in the area known as the Chautauqua Hills or, in the southeast portion of Chautauqua County, as the Sand Hills. Construction will require a right-of-way path of 150 to 175 feet wide for the clearing of trees and eventual placement of large H-frame poles that will be set 600 to 1,500 feet apart. The height of the pole structures will vary depending on the span length, clears and local terrain, but the H-frame poles typically are 80 to 160 feet in height.
Evergy currently estimates that the total Buffalo Flats project will cost $493,331,649. This is a preliminary estimate based on current costs of labor and materials and the cost to acquire needed right of way. The actual costs of construction may differ from this estimate and will be affected by, among other things, the final route selected, structure design, changes in commodity prices and labor rates.
How will Evergy customers’ monthly bills be impacted by the project? For Evergy’s retail customers, the amount paid by Evergy to SPP for transmission 13 service is recovered through the Transmission Delivery Charge (TDC). Evergy estimates that its portion of the proposed project will cost approximately $5.5 million and will be in service in 2029. The cost to customers will be the highest in the first year the project is in service and will decline over time as the assets depreciate. For an average residential customer using 1,000 kWh per month, the impact would be $3.37 per year in 2029 and decline each year thereafter as the asset depreciates.
Evergy said in its KCC application that the company selected the tentative route “after several information open houses through which it received Evergy selected the route after several open houses through which it received input from landowners and residents in the areas along potential routes. Evergy also sought and received input from state and federal agencies and public interest groups. All of the information received from these contacts was used to identify a route that minimizes adverse social and environmental impacts of the line.”
The Kansas Corporation Commission will allow public comment on the project during the first of two information sessions ins the coming days. The first public hearing will be held on Wednesday, Jan. 7 at Sedan High School, 416 Elm Street in Sedan. The information open house will run from 3:30 to 6 p.m. The public hearing will begin at 6 p.m.
The second public hearing will be held at 6:00 p.m. on Thursday, Jan. 8 at the Richardson Performing Arts Center at Southwestern College, 100 N. College St. in Winfield. An open house will be held from 3:00 to 6 p.m. in Christy Room 201. Both are located in the Christy Administration Building.
Anyone unable to attend in person may participate by Zoom with advance registration by noon the day prior to the hearing. The Commission is also accepting written comments through 5 p.m., Jan. 23, 2026. To register to attend by Zoom or submit a written comment, visit https://kcc-connect.kcc.ks.gov/s/public-comments.
In addition, the hearings will be broadcast live on the agency’s YouTube channel (type Kansas Corporation Commission in the Search field) and will be available for later viewing.