Hundreds of people united in protest over controversial plans for 50-metre-high pylons to be built over swathes of the Suffolk countryside on Saturday.
The gathering on the Norfolk and Suffolk border was against National Grid's contentious proposal to install the 112-mile line of pylons, stretching from Dunston, near Norwich, to the south-east.
The power company - which consulted over the Norwich to Tilbury project in the summer - said the scheme is needed to take energy from wind farms off the Norfolk coast to increase supply as demand increases.
But campaigners say the towering structures will have a devastating impact on the countryside and communities in Suffolk, Norfolk and Essex.
They say not enough has been done to explore alternative options, such as putting the cables offshore, under the sea.
Rosie Pearson, from action group Essex Suffolk Norfolk Pylons, who spoke at the protest, said it would be a "travesty" for pylons to be built in the area and that the group would keep fighting the plans.
Christine Murton organised the protest in Wortham Ling.
The National Grid says an offshore grid would be costlier to energy bill-payers and have less capacity, saying the proposals are "needed urgently to connect new green energy to the grid to ensure homes and businesses in East Anglia and across the country can benefit from more affordable, clean electricity."
The have vowed to consider feedback carefully following the public consultation.
Central Suffolk and North Ipswich MP Dan Poulter was among those at the protest.
Speaking afterwards, he said: "What we've seen here is communities across Norfolk, Suffolk and Essex coming together to fight against these proposals.
"All of us find these proposals unacceptable and we believe there are better alternatives.
"I am going to work with other MPs and local communities to continue the fight and make sure we see off these pylon proposals and bring forward sensible plans."
Leaders of Norfolk, Suffolk and Essex county councils have written to National Grid, urging a rethink over the power line project.
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