National Grid has revealed plans to use 25 miles (40km) of pylons to connect to controversial planned wind farms in Powys.
In addition to the pylons, eight miles (nearly 13km) of cables would be buried underground in the Meifod valley.
National Grid has also identified a preferred “secluded” site for a substation, on the Tir Gwynt wind farm.
Montgomeryshire’s Conservative MP Glyn Davies said the scale of the entire project was “completely outrageous”.
The wind farm plans have sparked opposition from campaign groups, while a public inquiry is already under way.
BBC Wales’ environment correspondent, Iolo ap Dafydd reports.
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