The ``Rooftops that feed`` project transforms solar energy from the roofs of homeowner associations into digital social currencies (ILLA) that can be exchanged for fresh produce in local stores
Local shops willing to contract the energy produced from the rooftops of the neighbourhood
HOAs (Homeowners Associations) use their rooftop to receive a local currency to buy at the local commerce.
The local church La Candelaria. They accept ILLAs as payments for the electricity their rooftop is providing,
Companies or photovoltaic energy providers that help finance the installation of solar panels.
``El programa está dirigido por Impact Hub Vienna y la Universidad Politécnica de Madrid (Oficial) y está financiado por EIT Climate-KIC.``