Green Gen’s proposals have previously sparked protests and legal action, as well as a pledge from the Plaid Cymru-led Welsh government to prohibit the use of large-scale steel pylons.
The company said its new pylon had been inspired by “monopole designs commonly used across Europe”.
“Monopoles are single-pole structures designed to carry significant electricity network capacity within a slim and compact profile,” it explained.
The company had previously proposed using 27m tall steel pylons, whereas this new design would be nearer 22m.
Wooden-pole alternatives are around 12m high but can carry less electricity.
Using monopoles rather than wooden ones would mean fewer overhead lines are needed, the company said, reducing impacts on farmland and scenery.
They have argued that relying solely on putting cables underground is prohibitively expensive and disruptive.
The new monopoles will be used on the firm’s Towy Usk, external and Towy Teifi, external projects – as part of a “toolkit” which also includes wood poles, underground cables and traditional pylons.
A prototype is expected to be ready to be installed in early 2027 for communities to see.
