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R
- Renewable energies (regenerative energies)
They are energy sources bound in carriers, which renew themselves or grow. Regenerative energy sources are inexhaustible, like solar energy (with the indirect forms biomass, water power, wind power, environment warmth, etc.) as well as earth warmth and tidal energy.
- Rest utilization time
It describes the remaining period in which a building is under normal maintenance and suits the demands of the owner.
