New Delhi, April 7 -- Battery storage is now cheap enough in India that solar power can meet 90% of the country's power demand at lower lifetime costs than current average purchase rates in most states, a new study has found, a finding that could potentially point to a future buffer against global energy shocks. Essentially, solar power can affordably supply India with power day and night for most months, especially in states with high solar irradiance (a measure of solar intensity). Modelling by energy think tank Ember showed that India could have met 90% of its electricity requirements in 2024 with solar and battery power at a levelised cost of electricity (LCOE) - a metric to evaluate the average cost of power generation for an energy as...