Mercados-Aries International Mercados-Aries International would like to announce that our company is now a UNEF associate. UNEF is a Spanish Photovoltaic Union, a sectorial association of photovoltaic solar energy in Spain with a representation of more than 400 companies. The UNEF is a representative for practically all of the industry members: producers, installers, engineering companies, manufacturers of raw materials, modules and components, distributors and consultants.