How to Read Your Solar Electric Bill: A Complete Guide

Published Sun Mar 22 2026 · Updated Thu Jul 02 2026

**Direct answer:** Your solar electricity bill has three meter readings — **Import** (grid energy used), **Export** (solar sent back), and **Net** (Import − Export). You pay only on Net. Banked credits roll over monthly and reset every **March 31st** (financial year-end). Example: a 3 kW system in Delhi exporting 300 units/month against 350 imported = net billable 50 units ≈ **₹177 on the energy line** (50 × ₹3 domestic 0-200 slab = ₹150, + BRPL PPAC 17.94% ≈ ₹27). Fixed charges of ₹125/kW/month (BSES LT domestic single-phase, DERC-approved) are payable regardless — so a 3 kW sanctioned load adds ₹375/month.

Understanding your solar electricity bill can be confusing, especially with net metering, export units, and banked energy involved. Many homeowners install solar but still struggle to read their bill correctly or estimate savings. In this guide, we explain how to calculate your solar electricity bill step-by-step using real examples from India. You'll learn how import and export units work, how net metering is applied, and how to estimate your monthly savings accurately.

> **Quick Summary** > - **Primary Metric:** Net Metering (Import vs. Export) > - **Monthly Savings:** ~86% on the energy line (worked example: 350 imported → 50 net billable; ₹1,235 → ₹177) > - **Average Generation:** 120 Units (kWh) per kW per month > - **Key Benefit:** Rollover of excess units to the next month > - **Key Check:** Verify "Meter Constant" and "Export Units" on every bill

You’ve installed the panels, the sun is shining, and you’re feeling great about your contribution to a greener India. Then, the first electricity bill after solar installation arrives in your mailbox. You open it, expecting to see a zero, but instead, you see a confusing mess of 'Import,' 'Export,' 'Net Units,' and 'Adjustment Credits.'

If you live in Delhi, Noida, or Gurgaon, reading a **solar electric bill** can feel like deciphering a secret code. Between the fixed charges, regulatory assets, and green power surcharges, finding your actual **solar bill savings** requires a bit of detective work. Understanding **solar electric bill reading** is the final step in mastering your home’s energy economy.

In this comprehensive guide, we will break down exactly how to read your solar-connected electricity bill in India (2025-2026), specifically focusing on DISCOMs like BSES Rajdhani, TPDDL, and PVVNL.

## 1. Understanding Each Section of Your Electricity Bill

Before we dive into the solar-specific parts, let’s look at the foundation. Whether you are with BSES in South Delhi or DHBVN in Gurgaon, your bill is divided into three main categories: Energy Charges, Fixed Charges, and Surcharges.

### The Standard Components (Pre-Solar) 1. **Fixed Charges:** This is based on your "Sanctioned Load" (e.g., 5kW or 10kW). You pay this regardless of how much electricity you use. Solar does not usually reduce this unless you officially apply for a load reduction. 2. **Energy Charges:** This is the cost per unit (kWh). In India, this is usually "slabby," meaning the more you use, the higher the rate. 3. **Surcharges & Taxes:** These include Regulatory Assets, Pension Surcharges, and Electricity Duty. These are calculated as a percentage of your Energy Charges. **This is where solar saves you the most money!** Since solar reduces your net energy charges, your surcharges also drop significantly.

### The Solar Components (Post-Solar) Once you have **net metering** installed, three new figures will appear on your bill: - **Import (KWh):** Electricity you took from the grid (at night or on cloudy days). - **Export (KWh):** Surplus solar electricity you sent to the grid (during the day). - **Net Units:** Import minus Export. If Export is higher than Import, this number is negative or zero, and the extra units are "carried forward."

## 2. How Net Metering Credits Appear on Your Bill

The "magic" of a solar bill happens through **net metering**. This is a billing mechanism that credits solar energy system owners for the electricity they add to the grid.

In India, most DISCOMs follow a monthly billing cycle where units are banked. If your 5kW system in Dwarka generates 600 units but you only use 400 units during the day, the remaining 200 units go back to the grid.

### How to Find Your Credits On a **BSES bill reading** or a **TPDDL bill**, look for a section titled "Energy Details" or "Solar Generation Data." You will see two meter readings: - **Current Reading (Export):** The total energy your system has sent to the grid since day one. - **Current Reading (Import):** The total energy you have pulled from the grid.

The difference between last month's Export and this month's Export is your "Solar Benefit" for that month.

### Table 1: Residential Electricity Tariffs (2025-26) This table helps you calculate the value of every unit you save or export.

| City | Residential Tariff (₹/Unit) | Avg. Monthly Bill (Pre-Solar) | | :--- | :--- | :--- | | Mumbai | 10 | ₹5,500 | | Pune | 9 | ₹5,000 | | Delhi | 8 | ₹4,500 | | Hyderabad | 8 | ₹4,500 | | Kolkata | 8 | ₹4,500 | | Jaipur | 7.5 | ₹4,200 | | Gurgaon | 7.5 | ₹4,200 | | Faridabad | 7.5 | ₹4,200 | | Noida | 7 | ₹4,000 | | Bangalore | 7 | ₹4,000 | | Ghaziabad | 7 | ₹4,000 | | Lucknow | 6.5 | ₹3,800 | | Chennai | 6.5 | ₹3,800 | | Chandigarh | 6 | ₹3,500 | | Ahmedabad | 5.5 | ₹3,200 |

*Note: Tariffs are estimated averages for the 200-500 unit slab.*

## 3. Before vs. After Solar: A Real Bill Comparison

To truly master **solar electric bill reading**, you need to see the "Before and After." Let’s look at a typical 3BHK home in Noida Extension.

### Real-Life Example: The Sharma Family - **System Size:** 5kW Rooftop Solar - **Average Generation:** 600 units/month - **Average Consumption:** 700 units/month

**Before Solar (Monthly):** - Total Units Consumed: 700 - Rate: ₹7/unit - Energy Charge: ₹4,900 - Surcharges (approx 20%): ₹980 - Fixed Charges: ₹500 - **Total Bill: ₹6,380**

**After Solar (Monthly):** - Total Units Consumed: 700 - Solar Generation (Self-Used): 400 units - Solar Generation (Exported): 200 units - Grid Import: 300 units (700 total needed - 400 self-used) - **Net Billing Units:** 300 (Import) - 200 (Export) = **100 units** - Energy Charge: 100 units x ₹7 = ₹700 - Surcharges (approx 20%): ₹140 - Fixed Charges: ₹500 - **Total Bill: ₹1,340**

**Monthly Savings: ₹5,040 (~79% Reduction)**

Learn more about how rooftop solar can eliminate your bill.

## 4. Common Billing Mistakes and How to Catch Them

Even in 2026, billing errors happen. When you are looking at your **electricity bill explained India** style, watch out for these three red flags:

### 1. Wrong Meter Constant Check the "Meter Constant" (often 1.0). If the DISCOM incorrectly enters this as 10 or 0.1, your billed consumption will be 10x higher or lower than reality. This is a common error during the first few months of **net metering bill** issuance.

### 2. Missing Carry-Forward Units In most Indian states, if you export more than you import, the surplus units must carry forward to the next month till the end of the settlement period (usually March 31st). Check the "Banked Units" section. If your balance resets to zero in October, your DISCOM may have a processing error.

### 3. Generation Based Incentive (GBI) Not Credited If you are in Delhi, the state government offers a GBI (Generation Based Incentive) of ₹2 to ₹3 per unit generated. This is often paid as a separate credit on your bill or a direct bank transfer. - Read more about GBI and extra solar income

## 5. How to Calculate Your Actual Savings from Solar

To calculate your ROI accurately, don't just look at the "Amount Due." Follow this formula:

**Total Savings = (Solar Units Self-Consumed × Tariff) + (Exported Units × Tariff) + Reduction in Surcharges + GBI Credits**

Why is "Self-Consumed" energy important? Because those are units you never bought from the DISCOM, so they don't even show up on the bill measurements (Import/Export). You can find this number by looking at your Solar Inverter's App and subtracting the "Export" shown on your electricity bill.

### Example Calculation for 2026: If your inverter shows 600 units generated, and your bill shows 200 units exported: - You self-consumed 400 units. - You avoided paying for 400 units at peak slab rates (e.g., ₹8/unit) = ₹3,200 saved. - You credited 200 units against your nighttime usage = ₹1,600 saved. - You saved roughly 20% on surcharges of that ₹4,800 total = ₹960. - **Total Monthly Benefit: ₹5,760.**

For those looking to maximize these savings, ensuring your panels are clean is vital. Dirty panels can lose 20-30% of their power, which directly shrinks your "Export" credits.

## Bill Line Reference Table

## Frequently Asked Questions

### Why is my solar bill not zero? A solar bill is rarely exactly zero because of "Fixed Charges" and "Minimum Monthly Charges" mandated by DISCOMs like BSES or TPDDL. Even if you export more than you import, you must pay the fixed cost for being connected to the grid. However, your energy charge can definitely reach zero.

### What is the "Carry Forward" or "Banked Units" section? This represents the surplus solar energy you generated during sunny months (like May) that you didn't use. These units stay in your "bank" to be used during high-AC months or winter months when generation is lower.

### What happens to my excess credits at the end of the year? In most states like Delhi and UP, at the end of the financial year (March 31st), any remaining banked units are "flushed." The DISCOM pays you for these units at a pre-defined "Average Power Purchase Cost" (APPC), which is usually lower than the retail tariff (around ₹3-4 per unit).

### Does my bill show how much solar I produced in total? Usually, no. Your DISCOM bill only shows "Export"—the portion of solar energy you didn't use immediately. To see your total production, you must check your solar inverter's monitoring app or your dedicated solar generation meter.

### Why did my bill increase after installing solar? This is almost always due to a "Meter Constant" error or a faulty net meter installation. If you notice a spike, immediately contact Bridgeway Power or your DISCOM to request a meter testing and billing correction.

### How do I read a BSES Yamuna or BSES Rajdhani solar bill? BSES bills show three meter readings: **Import** (grid energy you used), **Export** (solar energy you sent back), and **Net** (Import − Export). You pay only on Net. The "Meter Constant" line should read **1** for residential — anything else flags a meter error.

### What does "Banked Units" mean on my Tata Power or Adani solar bill? Banked units are the excess solar credits carried forward to next month. Under Delhi/Mumbai net-metering rules, banked units reset to zero at the end of the **March billing cycle** (financial year-end), so use them before then.

### Why is my net metering bill showing zero export but my inverter shows generation? This means your **net meter is mis-configured** — it's recording solar export as import. Demand an immediate meter test from your DISCOM (free under MNRE rules) and a billing correction for the previous 3 months.

### What is the per-unit rate for exported solar in 2026? Delhi: credit at full retail tariff (₹7–8/unit slab). Maharashtra: ₹3.5/unit flat. Karnataka: ₹3.07/unit. Always read your specific DISCOM's tariff schedule, not generic rates.

### How long should I keep old solar electricity bills? Keep **minimum 25 months** of bills — both for warranty claims on your inverter/panels and to prove generation history if you ever need to dispute meter errors or apply for a top-up subsidy.

## Glossary

- **Net metering** — Billing arrangement where you pay only for the difference between grid energy imported and solar energy exported in a billing cycle. - **Banked units** — Surplus solar credits carried forward to the next month, settled annually on March 31st at APPC (~₹3–4/unit) in most Indian states. - **Meter constant** — A multiplier (default 1.0 for residential) applied to raw meter readings to derive billed consumption. A wrong value inflates or deflates your bill 10×. - **Export tariff** — Per-unit rate at which your DISCOM credits exported solar. Delhi: full retail tariff. Maharashtra: ₹3.5/unit. Karnataka: ₹3.07/unit. - **APPC** — Average Power Purchase Cost, the wholesale rate at which leftover banked units are cashed out at year-end (usually ₹3–4/unit, lower than retail). - **Sanctioned load** — The kW capacity your connection is approved for. Fixed charges are billed per-kW of sanctioned load regardless of usage or solar export.

## Conclusion: Take Charge of Your Solar Savings

Mastering **solar electric bill reading** is the only way to ensure you are getting the full ROI on your investment. By understanding the interplay between Import, Export, and Net Units, you can optimize your appliance usage—for example, running your washing machine and dishwasher during peak sunlight hours to maximize self-consumption.

If you are still seeing high bills or find your **net metering bill** confusing, it might be time for a professional audit. At Bridgeway Power, we don't just install panels; we ensure your system is performing at its peak through our dedicated AMC services and billing support.

**Ready to slash your bills?** Use our Solar panel cost calculator — India to see how much you could be saving, or contact us for a free rooftop site survey today!

Explore more solar guides on our blog | Learn about Community Solar

## Related Reading

- **1 kW Solar = 4–4.8 Units/Day in India** — How much your system *should* generate before you check the bill. - **PM Surya Ghar Subsidy Amount** — Confirm you got the right subsidy credited. - **SBI Solar Loan 2026** — Finance the top-up if your bill says you need more capacity. - **Solar AMC India** — Bill correction and meter audit included.

Related: see our full guide to rooftop solar installation in India for pricing, sizing, and the end-to-end process.

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## FAQ

### How exactly do slab tariffs work on my Delhi bill? Delhi slabs stack cumulatively: 0–200 units at ₹3/unit, 201–400 at ₹4.50/unit, 401–800 at ₹6.50/unit, 801–1200 at ₹7/unit, above 1200 at ₹8/unit. A 500-unit bill uses all four applicable slabs, not just the top one.

### What is PPAC and why did my bill jump in 2026? Power Purchase Adjustment Charge is a variable surcharge that discoms recover fuel-cost swings through. From April 2026 DERC moved PPAC to monthly recovery — BRPL 17.94%, BYPL 17.43%, TPDDL 16% on energy + fixed + PPAC-base charges. That is why bills rose without a tariff order.

### How does solar cut my bill under net metering? Every unit your solar generates offsets a unit from the top of your slab first (the most expensive one). A 3 kW system generating ~360 units/month typically wipes out the ₹6.50 and ₹7 slabs entirely, saving ₹2,500–3,200 depending on baseline usage.

### What is fixed charge and does solar reduce it? Fixed charge is per kW of sanctioned load, ₹125/kW in Delhi for domestic. Solar does not reduce this — you still pay for the connection. Only energy charges go down.