India is most cost-effective for generating rooftop solar energy at USD 66 per megawatt-hour.
The global study says China is marginally higher at USD 68 per megawatt-hour.
Roof-mounted solar panel in homes and industrial buildings is the fastest deployable energy generation technology.
This can fulfil up to 49% of the global electricity demand by 2050, the study says.
India has a significant solar rooftop potential of 1.7 petawatt-hour per year.
This is against the country’s current electricity demand of 1.3 petawatt-hour per annum.
The study analysed the global electricity generation potential of rooftop solar photovoltaics and the cost.
And, the cost of attaining the potential is the lowest in India.
Gujarat and Rajasthan offer the lowest rates, the study said .
In the US, it is at USD 238 per megawatt-hour and, in the UK, USD 251 per megawatt-hour.
The findings have an important implication for sustainable development and climate change mitigation efforts.
