Image copyright Getty Images Image caption The cold rooms are built on site, and are made of wood or other organic materials
Cold storage facilities that maintain the shelf life of traditional Nigerian food for up to three months are now being built.
High winds batter the trees in Akwa Ibom state and temperatures rise, so the cold room is constructed on the roof and uses thermoluminescent bricks to insulate it.
People can’t see the storage but electricity is provided for the room.
Because it’s built on site, it can have the same conditions of air temperature and humidity as the office where people keep their onions.
The difference is it’s non-electric, so no noise.
It is only heat transfer that makes the boxes for onions or carrots appear to be packed.
Ms Plummer says that someone like her could turn a cold storage facility in Nigeria into a modern storage hub because the technology is well established elsewhere.
She says she’s looking for people to come up with ideas.
These cold storage systems are not manned by people.
There could be opportunities for people who have an ideas for social enterprises or communities to host their own cold storage.
These might even be able to be adaptable for other uses like case Iotariozofi.
The rest of the funding for ColdHubs is being provided by the Japanese International Cooperation Agency.
They have also asked the UK government for support with the project, as they realise these cold rooms might become the first example of a green technology in Nigeria.
ColdHubs has identified more than 200 houses that need to be retrofitted for solar, something Ms Plummer hopes to fund.
This will help increase the viability of the cold storage space and the potential for it to be used as a hub.
This post was first published on our news blog, 17 May 2018.