One of the first questions every homeowner asks before going solar is: "How much will I actually save?" It's a fair question — solar is an investment, and you want to know the returns.
The good news? In Delhi, the combination of high electricity rates, generous subsidies, and the Generation-Based Incentive makes rooftop solar one of the best investments you can make.
Let's crunch the numbers for a typical 3 KW residential system in South Delhi.
The Basics: How Much Power Does a 3 KW System Generate?
In Delhi, 1 KW of solar panels generates approximately 4 units per day (averaged across seasons — more in summer, less in monsoon/winter).
- Daily generation: 3 KW × 4 units = 12 units/day
- Monthly generation: 12 × 30 = 360 units/month
- Annual generation: 360 × 12 = 4,320 units/year
This is enough to cover the electricity needs of a typical 2-3 BHK home in Delhi.
Savings Breakdown
1. Electricity Bill Savings
BSES Rajdhani's residential electricity rate averages around Rs 7 per unit (weighted average across slabs).
- Monthly savings: 360 units × Rs 7 = Rs 2,520/month
- Annual savings: Rs 2,520 × 12 = Rs 30,240/year
With net metering, any excess units you export to the grid are adjusted against units you consume at night — so you effectively save on every unit generated.
2. Government Subsidies
For a 3 KW system in South Delhi (BSES Rajdhani area):
| System Size | Subsidy per KW | Total Subsidy |
|---|---|---|
| 1 KW | Rs 30,000/KW | Rs 30,000 |
| 2 KW | Rs 30,000/KW | Rs 60,000 |
| 3 KW+ | Rs 30,000×2 + Rs 18,000×1 | Rs 78,000 |
Central subsidy (PM Surya Ghar): Rs 78,000
| Subsidy Type | Amount | Eligibility |
|---|---|---|
| Capital Subsidy | Rs 2,000/KW (max Rs 10,000) | All residential |
| Additional Subsidy | Rs 30,000 | 3 KW+ systems |
Delhi state subsidy: Rs 10,000 (capital) + Rs 30,000 (additional) = Rs 40,000
Total subsidy: Rs 1,18,000
The state subsidy figures are based on the current Delhi solar policy. The additional Rs 30,000 subsidy is available specifically for 3 KW and above systems in the BSES Rajdhani area.
3. Generation-Based Incentive (GBI)
Delhi's GBI program pays you for the solar power you generate:
| System Size | GBI Rate | Duration |
|---|---|---|
| Up to 3 KW | Rs 3/kWh | 5 years |
| 3 KW to 10 KW | Rs 2/kWh | 5 years |
For a 3 KW system:
- Annual GBI: 4,320 units × Rs 3/unit = Rs 12,960/year
- 5-year GBI total: Rs 64,800
4. Total Cost and Payback
| Item | Amount | |------|--------| | System cost (3 KW, indicative) | Rs 1,65,000 – Rs 1,95,000 | | Less: Central subsidy | -Rs 78,000 | | Less: Delhi state subsidy | -Rs 40,000 | | Your net cost | Rs 47,000 – Rs 77,000 |
With annual savings of Rs 30,240 (electricity) + Rs 12,960 (GBI) = Rs 43,200/year:
- Payback period: 1.1 – 1.8 years
- After payback: Pure savings for 23+ more years
The 25-Year Picture
Solar panels have a lifespan of 25 years (with gradual efficiency decline). Here's the long-term math:
| Benefit | Amount | |---------|--------| | Electricity savings (25 years) | Rs 7,56,000 | | GBI income (5 years) | Rs 64,800 | | Total benefits | Rs 8,20,800 | | Less: Net system cost | -Rs 47,000 to Rs 77,000 | | Net savings over 25 years | Rs 7,43,800 to Rs 7,73,800 |
That's over Rs 7 lakh in savings from a single investment of Rs 47,000 to Rs 77,000 (after subsidies).
These calculations use conservative estimates. Actual savings could be higher because electricity rates tend to increase by 3-5% per year, which means your solar savings grow over time while your system cost stays fixed.
What About Larger Systems?
If your electricity consumption is higher, a larger system makes even more sense:
| System Size | Monthly Generation | Monthly Savings | Subsidy | Net Cost | |------------|-------------------|-----------------|---------|----------| | 1 KW | 120 units | Rs 840 | Rs 30,000 | Rs 25,000–35,000 | | 2 KW | 240 units | Rs 1,680 | Rs 70,000 | Rs 40,000–60,000 | | 3 KW | 360 units | Rs 2,520 | Rs 1,18,000 | Rs 47,000–77,000 | | 5 KW | 600 units | Rs 4,200 | Rs 1,18,000 | Rs 1,57,000–2,07,000 |
The subsidy is capped at 3 KW for central and state schemes, so systems above 3 KW have higher net costs but still deliver excellent long-term returns.
Try Our Solar Calculator
Want to see the numbers for your specific case? Use our Solar Calculator — enter your monthly electricity consumption, select your area, and get instant estimates for system size, cost, subsidies, and savings.
Ready to Start Saving?
Going solar in Delhi has never been more affordable. With government subsidies covering a large portion of the cost and GBI providing additional income, most homeowners see a payback period of under 2 years.
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