María Regidor co-owns a mini-hydro power plant in Spain, which produces part of the electricity provided to the residents of the Castile and León region.

It's a brand new sector: the first steps date back to 2012. Today energy crowdfunding is a way of financing solar panel or wind turbine projects.

The European construction industry and home-builder citizens are increasingly aware of sustainable choices. Some solutions can be more expensive than others, although sometimes this only concerns the construction phase.