The document discusses a hybrid renewable energy system called the "HT system" that uses both solar concentration and biological combustion to generate electricity. It works by using concentrated sunlight to heat a liquid into steam, and also uses biomass combustion in a boiler, with the steam then powering turbines to produce electricity. The system can also cogenerate thermal energy. It is classified under Italian regulations that incentivize solar electricity production using thermodynamic cycles and promote efficient renewable energy systems.