When solar is the better first step
If your factory has unused roof or ground space and a high daytime electricity bill, solar is usually the fastest win. A rooftop solar system with net metering can cut daytime costs immediately, requires little daily intervention, and pays back in 4–7 years.
Solar works best when:
- You use most of your power during daylight hours.
- Your roof is structurally sound and unshaded.
- You want a low-maintenance, visible sustainability upgrade.
When biogas is the better first step
If your site produces organic waste from food processing, dairy, poultry, distillery or agricultural operations, biogas turns that waste into free fuel. It reduces waste disposal costs, cuts thermal energy bills, and gives you baseload power that solar cannot.
Biogas works best when:
- You have a steady stream of organic waste.
- You need heat or hot water, not just electricity.
- You want to reduce waste disposal costs alongside energy costs.
The hybrid answer
Most large Sri Lankan factories eventually benefit from both. Solar covers daytime electricity; biogas covers heat and evening power. Starting with whichever resource you already have, roof or waste, usually gives the fastest payback.