What-if savings
Over the last 12 months of metered usage. "At marginal rate" prices each saved unit at the all-in rate of the slab you were in; "slab-aware" re-bills each month without the saved units, so savings that cross a slab boundary are priced correctly.
| Change | Cost (Rs) | kWh saved / year | At marginal rate (Rs) | Slab-aware (Rs) | Payback |
|---|---|---|---|---|---|
| Replace AC with a 5-star inverter AC Input power scales with the ISEER ratio of the old and new rating. | 45,000 | 139 | 2,636 | 2,638 | 17.1 yr |
| Switch legacy lighting to LED Fittings above 10 W are assumed to drop to 30% of their wattage. | 1,500 | 339 | 6,216 | 6,219 | 0.2 yr |
| Fit a timer on the geyser A timer avoids reheating water that is already hot, assumed to cut heating hours by 25%. | 1,200 | 165 | 2,986 | 2,990 | 0.4 yr |