Rooftop solar installation as one of the main parts of annual added solar capacity in the world assigned a notable portion for itself. Only in 2019, it made up of more than a third of added capacity worldwide. Rooftop solar is essentially installed to meet a part or in some cases the whole electricity demand of end-users.
On the other hand, distributed solar installation or utility-scale installation accounted for an excessive amount of global solar installation. In spite of rooftop installation which generated electricity is directly used in situ, the distributed installation delivers the generated electricity to the grid in order to be used in cities or industries.
The self-consumption of solar power in collective buildings is not yet widespread but exists in the Netherlands, Sweden, France, Switzerland, and Germany. In Italy, PV systems connected through a private transmission line to a single end-user are allowed under specific conditions, and several countries are testing the concept. The idea of virtual self-consumption between distant points has been tested in Mexico, Brazil, France, and Australia, and it is now possible under certain circumstances in the Netherlands. In many countries, such policies encounter fierce resistance from many distribution system operators who fear for their future financing. With a growing share of distributed generation and self-consumption, the question of grid finance is a key issue to address, according to IEA.
Growing the share of the rooftop solar installation could be one of the possible solutions to mitigate the imbalance of supply and demand without needs to more land and land preparation. This can be addressed by the researchers more accurately to relieve public opposition to the low land-use efficiencies of renewables.
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