Why renewable energies are not suitable for cities?
Because cities do not give the optimal conditions for Weather or environmental phenomena that are the basis of renewable energies: spacious, sun and wind in abundance, availability of land or forest resources. Let us examine:
Sol (photovoltaic and solar thermal)
A solar installation needs a wide space on the roofs, quite rare in urban buildings. It precises South orientation (in Northern hemisphere), more difficult to find in the city. And top of all, you need a certain inclination without any solar shadow of chimneys, TV antennas, etc, even in winter.
Can you really accomplish all this in the roof of your building in town?
Wind (mini-wind power)
Wind speed increases with height above the ground level, but it should not be obstacles to stop it. In the cities the wind is slowed by the effect of buildings. Keep in mind that the turbines tend to cause noise and vibration, so it is not advisable to install on rooftops.
It is practically impossible to have a small water fall in a city to take advantage of hydropower.
Geothermal energy uses the heat (or cold) subsoil to transfer this energy to the building to heat or cool. In the cities it is really complicated to drill vertically or horizontally and the land is a scarce and expensive.
Wood and organic waste (biomass, biogas, biofuels)
Urban buildings do not generate enough organic waste o wood to feed a biomass boiler. City buildings there not have available large space to properly store big amounts of biomass or bioenergy.
All of space constraints and difficulties found in city buildings, disappear in the field. Rural contry have space without shadows, unobstructed wind, waterfalls, underground in abundance and generation of forest, agricultural or livestock residues.
In the city we can rarely find the right conditions. But if yes, then we face the inconsistency that renewable energies are not profitable in the city if the power line or natural gas is available. This is the subject of another post…
Perhaps you do not agree with my statements. What is your opinion?
- Public aids for energy needs, not for business (albertcampi.me)
- Challenges to Energy: A Push for Renewable Resources (openforum.com)