Data Stories
Explore Indiagraphs data stories on markets, inflation, and the real economy curated for clear, evidence-backed narratives.
Sand Batteries Explained: How Finland’s Sand Battery Stores Summer Solar for Winter Heating
What is a sand battery? A sand battery is a big, well-insulated tank filled with ordinary sand (or sand-like rock). When cheap renewable electricity is available, electric heaters warm the sand to about 500–600°C. Later, fans push air through pipes inside the hot sand to pull the heat back out for buildings, hot water, or […]</p>
India’s Renewable Energy in 2025: Capacity, Challenges, and Net Zero Progress
India’s clean energy journey is gaining serious momentum. In 2025, the country finds itself at a powerful crossroads – trying to balance booming energy demand, energy security, and climate responsibility. In this article we will take a deep, data-backed look at where India stands today, what’s working, what’s not, and how far we still have […]</p>