ENERGY SOURCES FOR SUSTAINABLE BUILDINGS
Use of green energy from the nature
Renewable energy sources are not the subject of construction itself, but foreseen and meaningfully used, lead to significant reduction in operation costs and are means of preserving the environment and preserving exhaustible natural resources. This is the main feature that turns the building into "green" and "sustainable" - leaving a smaller ecological footprint. A similar source, for example, is the solar hot water system, which is a popular solution.
The major renewable sources, widely used today, are solar and geothermal energy.