It warns of a rash of "broadband clutter" in national parks and areas of outstanding natural beauty.
The south west coast path stretches 630 miles and includes a National Park and five Areas of Outstanding Natural Beauty (AONB).
As well as Snowdonia, four designated areas of outstanding natural beauty, in Anglesey, Kent, Lincolnshire and Somerset would be affected by the new lines.
It also wants any new high voltage transmission lines to avoid areas of outstanding natural beauty, national parks, world heritage sites and green belt land.
Second-home owners may compete with local workers for houses in areas of outstanding natural beauty but they do also bring much needed cash and jobs to poor communities.
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He said that such large-scale urban sprawl was "not going to happen here" and reiterated the government's commitment to protect the green belt, national parks and areas of outstanding natural beauty.
The CPRE says the plans will spoil some of the UK's best-loved landscapes and it has warned of a rash of "broadband clutter" in national parks and areas of outstanding natural beauty.
Other improvements will include the running of new and some existing high voltage cables underground, particularly where they affect areas of outstanding natural beauty, and the construction of a new undersea link connecting Scotland with England and Wales.
It took me three days and apart from when I was traversing two areas that had been government-mandated as "areas of outstanding natural beauty" - the Ashdown Forest and the South Downs - I saw a mere handful of people in the countryside.
"This was a very tall structure, bigger than Big Ben, in open countryside against the Chiltern Hills, an area of outstanding natural beauty, surrounded by small villages and conservation areas with a lot of cultural heritage and listed buildings, " he said.
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