The first joint education campus is planned for Cardiff, which will see three schools combined onto one site.
Cantonian High School, Riverbank Special School and Woodlands High School will be rebuilt on a single site in Fairwater, and all three will have greater capacity for pupils.
Work is expected to begin in 2023, subject to planning and procurement.
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Cardiff Council revealed the development had progressed a step closer, with ISG construction company having been selected as the preferred bidder for the design and build of the new campus.
It is set to be the largest, both in scale and investment, of the city's education developments delivered under Cardiff Council and Welsh Government's Sustainable Communities for Learning Programme, which aims to develop schools and colleges and reduce buildings in poor condition.
The current Cantonian High School buildings will be replaced with new buildings on its current site in Fairwater, and the school will be expanded from six forms of entry to eight forms of entry, with sixth form provision for up to 250 pupils.
Woodlands High School will be relocated to the new campus from its current site adjacent to Trelai Park. New buildings will increase the capacity of the school from 140 to 240 places.
Finally, Riverbank School will also be relocated from its current site adjacent to Trelai Park, and its capacity will be increased from 70 to 112 places with more new buildings.
The campus will also offer comprehensive facilities which will be available for public use outside of school hours, but it has not been specified what these will be.
In December 2018, Cardiff Council's Cabinet agreed to hold public consultation on the proposals, which received more than 750 responses that were "extremely positive" overall.
Cardiff Council says the development will be the city's first 'Net Zero Carbon' campus, with particular attention paid to reducing the amount of greenhouse gases emitted during the construction of the project.
The school buildings will be powered from renewable energy sources, in line with the council's One Planet Strategy which outlines the city's ambition to mitigate climate change.
Deputy Leader of Cardiff Council, and Cabinet Member for Education, Employment and Skills, Councillor Sarah Merry, said: "The Fairwater Campus will be Cardiff's first joint educational campus of its kind and awarding the design contract is an exciting milestone for the futures of Cantonian, Woodland and Riverbank Schools, who are all part of this unique and ambitious plan.
"The campus will be one of the most educationally advanced institutions in the UK, bringing together three very different schools each with their own identity, on one site and providing a distinct combination of learning which will allow each school to share facilities, expertise and teaching opportunities, providing an exceptional experience for students, staff and the community."
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