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There are great potentials in improving efficiency, and in addition, energy efficiency and renewable energy go hand in hand for solving the issue of climate protection.
The Passive House is a perfect example for this:
|The Passive House development in Hannover Kronsberg is supplied with energy from
renewable sources: solar collectors for hot water generation - and electricity comes
from this wind turbine near the development.
Due to the very high energy efficiency of the Passive House, there are increased opportunities for an adequate supply of energy though renewable sources. For one thing, the technical prerequisites are excellent: with low consumption even minimal power supplies are sufficient; and smaller power densities are a characteristic of renewable energy sources; for another thing, the cost-efficient implementation takes place in a better way: if the energy consumption is very low, the price for a kilowatt hour of conventional energy supply will usually be relatively high. In the Passive House, however, this doesn't matter because the consumption is so small that even high prices become bearable. That is the economic opportunity for renewable energy: the price per kilowatt hour is still high, but in a Passive House the user can afford it without any problem. Therefore the use of renewable energy with high energy efficiency is economically more attractive in relation to the conventional supply of energy.
|With constantly high energy consumptions, at the moment it is difficult to identify the contribution of renewable energy sources (colour) amongst the exhaustible sources (grey). However, a very positive estimate (column on the right) definitely shows significant levels of supplied energy.|
⇒ With poor efficiency, a relevant proportion will still be dominated by the fossil fuel sources in the future.
|In contrast, if the potentials for more efficient use are implemented, the same high absolute energy generation from renewable energy sources will make up a considerable part of the total supply; this can be as much as 50% for electricity, and for fuels it can be a quarter of the demand.
⇒ As a result, the use of fossil energy sources as a combination of “renewable + efficient” energy sources can be reduced to less than a third in comparison with the current value; this could be possible in around fifty years' time.
The more the “renewable energy sources and efficiency” objectives are actually implemented, the more significant the effects will be: