Collective self-consumption lets several associated consumers use energy from a nearby installation under agreed terms and allocation coefficients. Before estimating savings, confirm who will participate, where the panels will go and which meters will be included.
The community should review roof access and condition, shading, installation and maintenance access, and the needs of each home or common service. A technical assessment should set out costs, works, connection, metering and a clear allocation proposal.
Present options and agree in writing on participation, funding, maintenance and how future additions or changes will be handled. Check connection and allocation requirements for the specific case under Royal Decree 244/2019. A simulation cannot guarantee fixed savings; results depend on hourly use and financial terms.