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Unlike fossil fuels, non biomass renewable assets of energy hydropower, geothermal, wind, and photo voltaic do not directly emit greenhouse gases. In common, renewable energy is more expensive to produce and to apply than fossil fuel calories. Favorable renewable elements are sometimes observed in far flung locations, and it can also be expensive to buildchronic strains from case study answer renewable energy assets to case examine answer cities that need case examine answer electricity. An choice to decommissioning old flora, or constructing new ones, is to retrofit an present coal fired or oil fired plant to burn natural gas. While this is not case study answer most calories efficient use of herbal gas, it may well become case examine solution most economically feasible attitude to assist clean up an existing coal fleet whilst not having to invest in tons of of hundreds of thousands, and even billions, of dollars for back end pollution control accessories. Electricity markets around case study answer global are reworking from a model where electrical energy flows a technique from electrical energy producing energy vegetation to case study answer purchaser to 1 in which customers actively participate as providers of electric powered amenities.