They have started to appear across swathes of farmland across Norfolk - towering scaffold structures and makeshift roads.
And the reason for these new additions to the landscape south of Norwich has been revealed.
They are part of work being done by energy bosses to refurbish almost 40 miles of high-voltage power lines carried by pylons across the countryside.
Temporary roads have been laid out in fields near Swainsthorpe so work on the lines can be done, with some footpaths closed.
And scaffolding has been installed beneath pylons on farmland near villages such as Tharston, ready for the lines to be lowered so work can be done.
National Grid confirmed the work is to increase capacity in the power lines running between the Norwich substation and a substation in Suffolk.
A spokesman said: "National Grid is carrying out essential work to refurbish the existing high-voltage overhead line that runs between Bramford substation in Suffolk and Norwich substation.
"This will make sure our electricity network is fit for the future, enabling us to carry more power down the lines to homes and businesses where it is needed.
"The refurbishment programme involves replacing all the fittings and wires on the existing pylons along the length of the route.
"During the work to install the wires between the pylons, we erect scaffolding and use controlled lifting and lowering systems where the wires cross over roads.
"We expect to complete replacing the fittings and wires on all the pylons by spring, with reinstatement completed by summer 2024."
READ MORE: Norfolk County Council opposes Norwich to Tilbury pylons
The creation of new wind farms - and extending existing ones - off the coast of Norfolk has prompted the need to improve the infrastructure to connect that energy to the grid.
Off the A47, near Swardeston, Danish energy company Ørsted is building an onshore converter station, which will take power generated by the Hornsea Three wind farm.
National Grid is also hoping to secure permission to extend the main Norwich substation, near Dunston.
The energy company also has separate plans for a 112-mile line of pylons stretching from Dunston to Tilbury on the Thames estuary.
Those proposals have sparked controversy, with criticism from campaign groups, MPs and councils.
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