Plans to build 20,000 low-carbon social homes for rent in Wales by 2026 have been set out by the Welsh government's climate change minister.
The hope is to tackle both a housing shortage and the nation's greenhouse gas emissions.
Housing associations say it could lead to thousands of jobs and training opportunities.
But the Welsh government's opponents have said they would have gone further and built more.
All the houses will meet what the government describes as "bold, new quality and environmental standards".
Some could even become miniature power stations, using green technology to generate more electricity than they need. This could then be exported to the national grid to supply other homes.
Spending on social housing for rent in 2021-22 is to be doubled, with ministers committing £250m to the project.
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