Maharashtra’s TOD Tariff & Net Metering Rules:
Why Your Solar System Choice Now Matters More Than Ever

1. What Is Net Metering? Let’s Get It Right

Net metering is often misunderstood as “selling power to the government.” That’s not quite what it is. The better way to think of it is this: the grid becomes your battery.

When your solar panels generate more than you’re currently using, the surplus power flows out to the grid. Your net meter records those exported units. Later, when your solar isn’t generating — at night, on cloudy days — you draw those units back from the grid. The beauty is that the import and export are settled at the same effective tariff rate. You’re not selling and buying — you’re banking.

This is why net metering has been so powerful — your daytime solar surplus effectively offsets your evening consumption at full tariff value, not at some reduced buyback rate. Under Maharashtra’s net metering rules, this framework applies to rooftop solar consumers across the state.^[1]

2. Time of Day (TOD) Tariff — The Clock-Based Billing System

Under a traditional flat tariff, you pay the same rate whether you use electricity at noon or at midnight. Time of Day tariff changes this fundamentally: the rate you pay depends on when you use it.

Think of it like a cab. Same journey, but surge pricing in the evening rush hour makes it cost 1.3× what it does at midday. TOD applies the same principle to electricity — reflecting the real cost of power at different points in the day.

Why Did MERC Introduce TOD?

Maharashtra’s grid is under maximum stress between 5 PM and midnight: factories finishing shifts, every home switching on ACs, geysers, TVs, and lights simultaneously. In the middle of the day, solar power from thousands of rooftop installations floods the grid, reducing demand pressure. TOD pricing reflects this reality and creates a financial incentive to shift consumption away from the evening rush.

3. Maharashtra’s Three TOD Zones — Explained Clearly

MERC’s revised TOD framework under the Multi-Year Tariff Order divides the day into three zones.^[3] Here is precisely what each means for your bill:

The Solar-Hour Rebate in Numbers

During Zone 2, MERC offers a consumption rebate that varies by season:

The residential rebate rises progressively — reaching ₹1.00/kWh by FY 2029–30 — as MERC aligns incentives with growing daytime solar supply.^[3]

The Critical Mismatch: Where TOD Hurts Net Metering Users

Here is the scenario that now plays out for every on-grid solar consumer on TOD billing in Maharashtra:

For a consumer whose heaviest usage is in the evening — which describes most homes, most offices, most factories — the 20% peak surcharge is effectively a permanent fixture on their bill that on-grid solar cannot address at all.

4. The Grid Voltage Problem: Solar Going to Waste

5. On-Grid vs. Hybrid Inverter: The Real Difference Under TOD

An on-grid inverter was designed for a world of flat tariffs, no power cuts, and unlimited grid headroom. Two of those three assumptions no longer hold in Maharashtra. Here is how the two system types compare in the current environment:

6. FlinInfini Turbo Plus — Built for Exactly This

At Flin Energy, we designed the FlinInfini Turbo Plus 6kW-48V specifically for the kind of time-aware, scheduled energy management that Maharashtra’s TOD framework demands. It is India’s first IP66-rated solar hybrid inverter — engineered to work reliably in rooftop, outdoor, and light industrial settings that standard inverters are not rated for.

7. Warehouses & Factories: ESS Is Now a Financial Decision

For residential users, the 20% peak surcharge is an irritant. For high-load commercial and industrial consumers — warehouses, logistics hubs, cold storages, manufacturing plants, hospitals, data centres — the scale is completely different.

A medium-sized factory operating through evening shifts will draw thousands of units per month in Zone 3. At a 20% premium on top of commercial tariffs, this translates to ₹2–8 lakh in additional annual charges compared to a flat-tariff world. These are costs that did not exist a few years ago — and they appear on every bill, every month.

How an Energy Storage System (ESS) Works for Industry

Step 1 — Charge During Zone 2 (9 AM–5 PM): Rooftop solar generates at maximum output. Your hybrid inverter cluster powers daytime factory loads directly from solar.

Step 2 — Bank Surplus into Battery: Any solar generation beyond your daytime load charges a large LFP battery bank during solar hours — the cheapest energy you can possibly have.

Step 3 — Discharge During Zone 3 (5 PM–Midnight): As your evening shift begins and TOD peak rates kick in, the ESS discharges stored energy to your loads automatically. Grid import during the peak window drops dramatically or is eliminated entirely.

Step 4 — Resume Normal Grid Draw Post-Midnight: After 12 AM (Zone 1), you return to standard tariff rates for any remaining overnight operations.

Beyond TOD: Other Benefits for Industrial Consumers

Demand Charge Reduction: Many HT consumers pay demand charges based on peak kVA/kW drawn from the grid. Battery discharge during evening hours reduces peak grid demand, cutting demand charges on top of TOD savings.

Grid Independence: With a properly sized ESS, your operations are insulated from load shedding, voltage fluctuations, and outages — without diesel generator fuel costs.

Future-Proofing: TOD tariffs will become more differentiated across India over time. Maharashtra is already ahead of most states. ESS installed today protects against further tariff tightening.

ESG & Green Compliance: On-site solar + storage delivers verifiable emissions reduction — supporting CSR reporting, ESG targets, and green certifications increasingly required by large customers and export buyers.

8. The Clear Parallel: The Rules Have Changed. Your System Should Too.

Let’s put everything side by side one final time. Same solar panels. Same Maharashtra rooftop. Two very different outcomes depending on your system:

An on-grid inverter made perfect sense when tariffs were flat, power cuts were infrequent, and the grid could absorb unlimited solar exports. In Maharashtra in 2025, all three of those conditions are changing. The on-grid system is no longer mismatched in small ways — it is structurally misaligned with the regulatory environment it operates in.

A hybrid system doesn’t just generate solar power. It stores it intelligently and deploys it at the most financially valuable moment — every evening, automatically, for the life of the system.

This article is based on MERC regulations and the Multi-Year Tariff Order as revised through 2024–25. TOD zone timings, rebate percentages, and surcharge rates are subject to periodic revision by MERC. Consumers should verify applicable tariffs for their specific consumer category with their distribution licensee (MSEDCL / Adani Electricity / AEML). Financial projections shown are illustrative; actual savings depend on individual load profiles and tariff categories.