The final stage of consultation into a proposed route for overhead lines and underground cables is due to begin.
National Grid is planning to build a new 400,000 volt electricity connection between Bramford and Twinstead.
The proposals, which include locating a sub-station on an acre of land off the A134 Sudbury to Halstead road, have been met with objections from campaigners who believe the work would destroy the landscape of the Stour Valley.
Following a consultation earlier this year, National Grid, which is to take down a 132,000 volt line owned by UK Power Networks, confirmed it is to build an overhead line near Hintlesham and will be putting cables underground along two sections of the route.
Project manager Brian Smethurst said: “Of all the options considered, we believe this one has the least overall impact on the landscape, local communities and properties.”
National Grid is due to start a final public consultation at the end of the month. The proposals will then be submitted to the Planning Inspectorate next year.