Solar energy is now the better option versus coal as costs are going down at rapid pace. In 2010 cost was about $100 per megawatt hour, This is down to about $35 per megawatt hour in many countries including India by 2020 as cost for the lifetime of new plants. New solar farm plans cost less for renewable energy than coal fired plants. The Modi administration hopes to double then triple production of solar energy to meet India's growing needs. This makes it possible for the European Union to set targets of 32% for renewable energy in the total energy production by 2030.
The cost of coal has not changed much costing about $55 to $150 per megawatt hour for new plants.
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