Great River Energy proposes to build a new 4.3-mile 115-kV double-circuit HVTL between its existing 115-kV MV-VTT transmission line and the new Laketown Substation. […] High intensity EMF can have adverse impacts on the operation of implantable medical devices (IMDs) such as pacemakers and defibrillators. While research has shown that the MFs associated with HVTLs do not reach levels at which they could cause interference with such devices, it is possible that the EFs associated with some HVTLs could reach levels high enough to induce sufficient body currents to cause interference.
Source: wiktionary