In their daylife, human communities are generating a complex mix of energy demand: heat, electricity, cold and other energy driven services should be holistically taken into account in order to optimize energy harvesting from renewable sources, its storage and further conversions.
As it is been proved by interviews and audits, cooling services are representing the rising demand in Mediterranean buildings, followed by winter heating needs and finally by electricity for lighting and equipments. Accordingly with the STS-Med approach, such seasonal demand can be properly managed at a local, district, level by a polygenerative solar system. The collection of high quality solar radiation, mostly available in summer periods, can feed a solar cooling system in the hot days, while the same system can answer to the moderate heat demand in wintertime. Electricity can be generated by small turbines or by the integration, especially in small systems, of PV panels. Residual heat can be used to drive other services, as the purification of brackish or waste water. Along the year the solar resource could easily be integrated by the locally available biomass, especially to offer a 100% coverage of the winter needs by renewable sources, too.
STS-Med pilot plants will demonstrate that a smart integration of both commercially available and innovative solar technologies can really open a way towards the goal of zero energy communities in the Mediterranean region, where the management of available renewable sources is optimized to answer to the real needing of people, at a small-medium scale, without generating unwished loads on the grid.

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