Carbon Footprint: Renewable Energies, a Key Factor for Reducing Co2 Emissions

The current behaviour of demand, but not only the amount of energy demanded but also in which economic sectors is demand concentrated, how and where demand is estimated, and how it is managed is studied. Guarantee energy supply anytime and places when needed (Energy Security) is essential, even though economic processes are created on the fly. Economic processes must no longer adapt to energy availability; energy availability should adapt to them. Current sources of energy generation, renewable and non-renewable, current situation and near future of electric energy are analysed. The inaccuracies in the prediction of demand and in the capacity to generate energy (especially renewables) difficult to guarantee energy security. The balance between demand and generation is a function that resembles the transient regime, but without a tendency towards a stable value, although the growth or decrease is known approximately. Transient regime is the response of an electric circuit that is extinguished over time. Permanent regime is the response that remains constant until either the circuit or its excitation is varied. Renewable energies are the permanent regimen because their sources can be used permanently since they are inexhaustible, unlike non-renewable sources that are the transient regimen because they are finite.