What are renewable sources of energy? Explain any three, and write the ways to conserve energy.

1. 1 · Define. Renewable energy comes from sources that nature replaces: sun, wind, water, biomass. Non-renewable sources are coal, petroleum and natural gas.
2. 2 · Solar energy. Solar panels and water heaters; the Kamuthi solar park.
3. 3 · Wind energy. Windmills turn generators; the Muppandal wind farms.
4. 4 · Biogas. Dung rots without air in a digester, giving methane fuel and slurry manure.
5. 5 · Why prefer renewables. They never run out and give little pollution or CO₂.
6. 6 · Conserving energy.
   • Switch off when not in use
   • LED bulbs and BEE star appliances
   • Public transport and cycling
   • Pressure cookers and solar heaters
7. 7 · Link to daily life. An LED bulb in place of a 60 W bulb saves units on the family's electricity bill.
8. 8 · Close in one line. Saving energy and using renewables protects both resources and climate.

Scoring tip: Give a Tamil Nadu example for each source. Examiners like it.