SSEN Transmission has submitted appeals to the Scottish Government after plans for new 400kV substations at Emmock and Carnaig were rejected.
The company said the developments are key to reinforcing the electricity transmission network across the north of Scotland and Great Britain, allowing more renewable energy to be connected and transported.
It added that the projects would create jobs during construction and bring long-term economic benefits to local communities and the wider region.
In both cases, the decisions by Angus Council and Highland Council went against the recommndations of their own planning officers, the positions taken by internal consultees and all key statutory agencies, none of whom raised objections to the proposals.
SSEN Transmission said it also expects to appeal decisions to refuse consent for the proposed Hurlie and Fanellan substations, rejected by Aberdeenshire Council and Highland Council.
The schemes form part of a wider strategic programme to deliver new and upgraded transmission infrastructure across the north of Scotland.
Commenting on the submission of the appeals, Alison Hall, Director of Development said: “Upgrading the electricity transmission network in the north of Scotland is essential if Scotland and the UK are to deliver on our energy security and clean power ambitions. The proposed Emmock and Carnaig substations have been carefully designed to help meet that need.
"Our planning applications are informed by extensive development work, detailed technical assessment and thorough engagement with key stakeholders, including local communities.
"In addition to supporting clean, affordable power, these projects would deliver wider economic benefits, supporting jobs and local businesses during construction and helping to underpin longer‑term investment and economic growth.
"We strongly believe that we have developed robust and policy‑compliant proposals. Submitting these appeals will allow the merits of the projects to be fully and fairly considered, and we remain committed to engaging constructively with local communities and stakeholders throughout the planning process.”