This document reports the development of a hybrid and autonomous energy model with solar PV panels and a small CHP (combined heating and power production) system whose primary energy source is the biomass. Also it will be presented several rules for to achieve new energy efficiency levels of a service building. This energy model is also a new sustainable paradigm on energy consumption (electrical and thermal demands) of a small hotel building and supported by the gasification cogeneration technology. The energy model has economic viability demonstrated by the several financial and economical parameters (payback period, net present value and internal rate of return). It is one environment friendly process aiming the reduction of energy demand, costs and emissions This system is one relevant contribute to certify the building agree to the new national legislation of building thermal behaviour.