The Reform statement called on National Grid to halt the plan and “pursue less intrusive solutions”.
“Lincolnshire will not be a dumping ground for outdated and ugly infrastructure. Nor will it be a dumping ground for net-zero projects,” it added.
National Grid has argued that the cost of the pylon scheme would be £1.6bn, compared with at least £4.8bn for an underground cable and £4.2bn for a subsea cable.
The previous Conservative administration of Lincolnshire County Council criticised the utility company for a lack of transparency over costs and urged energy watchdog Ofgem to scrap the plans.
A spokesperson for National Grid said the existing electricity network did not “have the capacity to deliver the increasing demand for electricity”.
The Grimsby to Walpole project would lower electricity bills and the overhead line proposal was “far cheaper than alternatives”, they added.
A consultation on the plans will run from June 11 to August 6.
