How to Calculate PM Surya Ghar Subsidy

Every solar proposal you send should show the customer exactly how much they pay after subsidy, not a rough estimate, not "up to ₹78,000," but a precise number based on their system size, their state, and whether they're taking a loan. Most EPCs get this wrong by quoting the maximum subsidy regardless of system size, then explaining the discrepancy after installation.

This guide shows the exact calculation, step by step, with ₹ examples for every common system size.

The MNRE defines the central subsidy slabs in the PM Surya Ghar Muft Bijli Yojana operational guidelines. Your job as an installer is to translate those slabs into a precise ₹ figure for every customer, and to add the state top-up layer that most competitors miss.

The PM Surya Ghar Subsidy Formula, How the Slabs Work

The central subsidy is not a flat amount, it is a tiered calculation. The formula has two bands:

Band 1 (0 to 2 kW): ₹30,000 per kW installed

Band 2 (2 kW to 3 kW): ₹18,000 per additional kW (i.e., the third kW only)

Cap: Maximum central subsidy is ₹78,000 (for any system 3 kW or above). No additional subsidy for systems above 3 kW.

The formula in plain English:

• For systems up to 2 kW: Subsidy = System size (kW) × ₹30,000
• For systems from 2 kW to 3 kW: Subsidy = (2 × ₹30,000) + (remaining kW above 2 × ₹18,000)
• For systems above 3 kW: Subsidy = ₹78,000 (flat cap)

Calculating the Subsidy for Each System Size, A Complete Table

Adding the State Top-up Layer

The central subsidy is only Layer 1. Several state governments have stacked additional subsidies on top of the MNRE grant. The complete PM Surya Ghar guide covers all state top-ups. For your calculation, the state top-up is simply added to the central subsidy after you compute it.

Gujarat example (GEDA top-up):

• Central subsidy on 3 kW: ₹78,000
• GEDA state top-up: ₹15,000 (varies by beneficiary category, verify with GEDA before quoting)
• Total subsidy: ₹93,000

Rajasthan example:

• Central subsidy on 3 kW: ₹78,000
• RVUNL top-up (BPL households): ₹10,000
• Total subsidy: ₹88,000

Maharashtra, Tamil Nadu, Karnataka (as of mid-2026):

• Central subsidy only, no confirmed state top-up
• Total subsidy: ₹78,000 (on 3 kW)

The 4-Input Subsidy Formula, A Framework for Installers

The complete PM Surya Ghar financial picture for any customer requires four inputs. This is the 4-Input Subsidy Formula that top EPCs use to calculate the correct figure every time:

Input 1, Installed system size (kW) Apply the Band 1/Band 2 formula above. This gives you the central subsidy.

Input 2, State Add the confirmed state top-up (if any) for the customer's state.

Input 3, Consumer category Government employees and some RWA schemes get additional top-ups in certain states. If your customer is a government employee or lives in a society applying collectively, check for additional benefits.

Input 4, Loan or self-funded? If the customer is taking an IREDA or bank concessional loan, the effective upfront cost is zero (or near-zero), the subsidy reduces the loan principal, not the cash payment. Present both scenarios in your proposal.

Running these four inputs consistently eliminates slab errors and customer disputes.

The Concessional Loan EMI Calculation

The IREDA and partner banks (SBI, Bank of Baroda, Canara Bank) offer PM Surya Ghar-linked loans at approximately 7% per annum. The customer's EMI is calculated on the net project cost after subsidy, not the gross project cost.

EMI calculation formula: EMI = [P × R × (1+R)^N] ÷ [(1+R)^N – 1]

Where P = net loan amount, R = monthly interest rate (7%/12 = 0.583%), N = tenure in months.

For most customers who can't or don't want to calculate this themselves, use this approximate table:

Worked Examples, Three Real Customer Scenarios

Scenario A, Imran, solo installer, 1.5 kW apartment in Aurangabad

Customer details: 450 sq ft flat, bill of ₹900/month, MSEDCL connection, no state top-up available.

• System size: 1.5 kW
• Central subsidy: 1.5 × ₹30,000 = ₹45,000
• State top-up: ₹0 (Maharashtra, no confirmed top-up mid-2026)
• Total subsidy: ₹45,000
• Estimated project cost (all-in, ALMM modules): ₹1,10,000
• Net customer cost: ₹1,10,000 – ₹45,000 = ₹65,000
• IREDA 7%, 5 years: ~₹1,287/month EMI
• Customer's current bill: ₹900/month → EMI exceeds bill but system generates 180 units/month, reducing bill to ~₹200/month → net cost: ₹1,487 vs. savings of ₹700 → EMI ends year 5, after which ₹900/month is effectively free

Scenario B, Rohit's team, 3 kW bungalow in Surat (DGVCL)

• System size: 3 kW
• Central subsidy: 2 × ₹30,000 + 1 × ₹18,000 = ₹78,000
• State top-up (GEDA): ₹15,000 (verify before quoting)
• Total subsidy: ₹93,000
• Project cost (all-in): ₹1,95,000
• Net customer cost: ₹1,95,000 – ₹93,000 = ₹1,02,000
• IREDA 7%, 5 years: ~₹2,010/month EMI
• Customer's DGVCL bill: ₹2,400/month → saving ₹390/month from day one; full ₹2,400/month savings from year 6

Scenario C, Commercial customer, 10 kW office rooftop in Pune (MSEDCL)

• System size: 10 kW (residential subsidy capped, commercial buildings are ineligible)
• Central subsidy: ₹0 (commercial consumers are not eligible for PM Surya Ghar)
• Separate state-level commercial solar subsidies may apply, check with MSEDCL
• Project cost (all-in): ~₹5,50,000
• No subsidy applicable; business ROI via electricity bill savings and depreciation

What Changes the Number, Variables Most EPCs Miss

The subsidy calculation seems straightforward, but these variables can change the final number:

1. The DISCOM-sanctioned capacity vs. installed capacity. If feasibility is granted for 3 kW but the roof can only fit 2.5 kW, the subsidy is for 2.5 kW (₹69,000), not 3 kW.

2. Module wattage and count. A "3 kW system" can use 8 × 375 Wp = 3 kW or 9 × 345 Wp = 3.1 kW. The subsidy is calculated on the total kWp installed, rounded to two decimal places. Minor differences between quoted and installed capacity can affect the slab calculation marginally.

3. Pre-owned properties with existing subsidies. If a previous owner already claimed PM Surya Ghar on the same meter, the new owner cannot claim again, the subsidy is tied to the consumer number, not the individual.

4. Government housing scheme beneficiaries. Residents of PM Awas Yojana or similar housing may have different subsidy structures in their specific state, check the state nodal agency.

Common Calculation Mistakes EPCs Make

1. Using ₹78,000 as default for all system sizes. A 1 kW system gets ₹30,000. A 2 kW system gets ₹60,000. Quoting ₹78,000 to a 2 kW customer and then correcting it at commissioning = lost trust.

2. Forgetting that subsidy is post-installation. The customer's net cost at point of sale is still the full project cost. The ₹78,000 arrives later. Your proposal must show both the gross cost and the net post-subsidy cost clearly labelled.

3. Citing state top-ups that have expired. State schemes change frequently. An outdated top-up figure in your proposal is legally your problem if the customer relied on it.

4. Not mentioning the concessional loan option. Many customers can't pay ₹1,95,000 upfront but can comfortably pay ₹2,010/month EMI. If your proposal only shows the net cash cost, you're losing customers who could close if you showed them the loan scenario.

5. Rounding errors on fractional kW systems. 2.3 kW gets: (2 × ₹30,000) + (0.3 × ₹18,000) = ₹60,000 + ₹5,400 = ₹65,400. Many installers round to ₹60,000 or ₹78,000. Always calculate to the decimal.

See how accurate subsidy math fits into a complete proposal in the guide to creating a professional solar proposal PDF.

How QuickEstimate Does This Automatically

Manually calculating subsidy for each customer, accounting for system size, state, loan vs. cash, is exactly the kind of repetitive work that slows down your sales team and introduces errors.

• Proposal Generator, Enter the system size and state; the PM Surya Ghar subsidy is auto-calculated using the correct slabs. Your team can't quote the wrong number because the app does the math.
• Quotation System, Show the gross cost, the central subsidy, the state top-up, and the post-subsidy net cost on a single branded page, no manual formatting, no Excel.
• WhatsApp Follow-up, Send the calculation to the customer via WhatsApp, with a read receipt so your team knows when to call for the close.

The complete guide to solar CRM software in India shows how EPCs are using automation to eliminate calculation errors across the full sales cycle.

What to Do This Week, For Your EPC

1. Recalculate your three most common system sizes. Apply the exact Band 1/Band 2 formula above for 1 kW, 2 kW, and 3 kW systems in your state. Write the results on a physical card that every sales person carries.

2. Add the loan scenario to every proposal. For any system above 2 kW, always show both the cash-payment option (net cost after subsidy) and the loan-payment option (EMI on net cost at 7%). The loan scenario converts customers who would otherwise wait.

3. Verify your state top-up figure. Before the next customer meeting, call your state nodal agency or check their portal to confirm the current top-up amount. If it's changed, update your proposals immediately.

Frequently asked questions

How do I calculate PM Surya Ghar subsidy for a 2.5 kW system?

For 2.5 kW: Band 1 covers the first 2 kW at ₹30,000/kW = ₹60,000. Band 2 covers the additional 0.5 kW at ₹18,000/kW = ₹9,000. Total central subsidy = ₹69,000. Add any state top-up on top of this. The subsidy is disbursed post-installation as a Direct Benefit Transfer to the customer's Aadhaar-linked bank account.

Is the PM Surya Ghar subsidy the same in all states?

The central government subsidy is the same across all states, the three-slab formula applies universally. However, some states (Gujarat, Rajasthan, Madhya Pradesh, Delhi) layer additional state top-up subsidies on top of the central amount, which vary by state and beneficiary category. Maharashtra, Tamil Nadu, Karnataka, and UP had no confirmed additional state top-up as of mid-2026.

Does system size above 3 kW get more subsidy?

No. The central PM Surya Ghar subsidy is capped at ₹78,000 regardless of system size above 3 kW. A 5 kW system and a 3 kW system both receive ₹78,000. For larger systems, the subsidy represents a smaller percentage of project cost. Commercial consumers are ineligible for PM Surya Ghar, it is a residential-only scheme.

When is the subsidy paid, before or after installation?

After installation. The PM Surya Ghar subsidy is paid as a DBT (Direct Benefit Transfer) to the customer's Aadhaar-linked bank account only after: (1) the installer submits the commissioning report on the national portal, and (2) the DISCOM inspects and approves the installation. This process typically takes 30–60 days after commissioning.

Can I show the subsidy as a discount on the invoice?

No. The subsidy is a government payment to the consumer, it is not a dealer discount. Your invoice should show the full project cost. The customer will receive the subsidy in their bank account separately. Some installers issue a proforma showing the "effective cost after expected subsidy" as a communication tool, but the formal invoice must show the full project value.

How is the concessional loan calculated with the subsidy?

The loan amount is calculated on the net project cost after the expected subsidy. For example, if the project costs ₹1,95,000 and the total subsidy is ₹93,000, the net cost is ₹1,02,000. The bank lends ₹1,02,000 (or the customer chooses a lower amount if they can pay part upfront). EMI is calculated on this net loan amount at ~7% per annum over the chosen tenure.