Transmission lines have been shown to have significant negative impacts on property values.  A 2012 study in Montana on the effects of large transmission lines on property values, revealed a drop of approximately 15% in property values, even when the property was as far as 1000 ft from the transmission line. (James A. Chalmers, transmission Line Impacts on Rural Property Value, Right of Way (May/June 2012))  https://www.irwaonline.org/eweb/upload/web_mayjune12_Transmission.pdf

A Wisconsin report by Kurt Kielisch, “Valuation Guidelines for Properties with Electric Transmission Lines,” notes that the negative impact of high-voltage transmission lines on Wisconsin property values can range from -10% to -30% depending on such factors as the size of the line and its proximity to the property. https://puc.sd.gov/commission/dockets/electric/2013/EL13-028/guidelines.pdf

The TELIS project (Transparent Electrical Line Impact Studies) is a recent effort to gain access to the data sets used to study the value impact of high-voltage electric transmission lines on different property types.  The TELIS project is an important independent attempt to create transparency in the valuation process of properties taken by powerlines. The goal is to provide a complete report on how data are selected and analyzed. http://concernedcitizensmontana.net/telis-project/
Tourism and rural development are also likely to be adversely impacted by the high-voltage Cardinal-Hickory Creek transmission line.  Construction of the line and the consequent marring of the scenic Driftless Area landscape could lead to a drop in tourist numbers and the devaluing of existing conservation easements.  The threat of the proposed line has already established a ‘black cloud’ on property sales, purchase of conservation easements, and environmental protection practices while property owners, buyers, and conservation groups wait for the final-outcome of the proposed high-voltage Cardinal-Hickory Creek project.