Parts for 18 wind turbines will be transported Mondays to Saturdays inclusive to the Rothes Cairn Uish wind farm site, near Fogwatt.
It is expected to take until 8 March to complete.
Police say the loads measure up to 52 metres in length and up to 3.5 metres in width.
As a result of their size, each convoy is to be escorted by police.
The convoy will leave Invergordon Harbour via the B817, Saltburn Road, and then take the road to the rear of Inverbreakie Industrial Estate before joining the A9 Tomich.
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The route from Inverness Harbour will be along Stadium Road to Longman Roundabout, where the convoy will turn onto the A9.
Both convoys will then follow a route along the A96, through Nairn and Elgin before heading south on the A941 to Fogwatt.
Each convoy will leave at 09:00, with those from Inverness expected to reach Nairn about 09:45 and Elgin about 10.45.
Convoys from Invergordon are expected to reach Nairn about 10.45 and Elgin about 11.45.
Sergeant Chris Whelan, from Grampian Police’s Road Policing Department, Elgin, who is in charge of the operation, said: "By their very nature, these wind turbine components are cumbersome and can be slow to manoeuvre. It takes great skill on the part of the lorry driver to ensure each load is moved safely and as efficiently as possible. I would ask motorists to exercise patience and if necessary, find an alternative route to avoid unwanted delays".
(IT/GK)
