Net metering policy decides how exported rooftop solar energy is adjusted against grid consumption. In India, the answer depends on central policy direction, state regulations, DISCOM process, sanctioned load and the metering method approved for your connection.
So the right question is not “What is net metering in India?” The right question is “What does my state regulation and DISCOM allow for my category today?”
Who shapes rooftop solar policy in India?
Several institutions touch rooftop solar, and each has a different role.
MNRE promotes renewable energy programmes and rooftop solar direction. The Ministry of Power influences broader electricity policy. State Electricity Regulatory Commissions frame state-level regulations for net metering, net billing, gross metering, banking and related commercial treatment. DISCOMs implement approvals, meter changes, billing and consumer records.
This split is why a solar salesperson’s national slide may not match your actual bill. A Pune factory, Bengaluru office, Surat unit and Chennai warehouse may all hear “net metering”, but the approval process and settlement can differ.
For responsible system sizing, start with solar sizing from electricity bills, then confirm the current local approval route.
What is net metering, net billing and gross metering?
The names describe how import and export energy are treated.
In net metering, exported solar energy is adjusted against imported grid energy according to the applicable regulation. In net billing, import and export are treated with separate billing and compensation logic. In gross metering, solar generation may be measured and settled separately from consumer import.
The commercial result can be very different even when the same panels are installed.
Keep the distinction clear:
- net metering focuses on energy adjustment
- net billing separates import billing and export credit
- gross metering treats generation as a separate metered stream
- banking rules decide how unused eligible energy is carried or settled
- DISCOM billing software decides how the approved method appears on bills
Do not assume export has the same value as avoided import. The regulation decides.
Why do banking and settlement rules matter?
Banking is the policy treatment for eligible surplus energy that is not consumed immediately. It can affect factories with weekly holidays, seasonal production, monsoon changes or daytime load variation.
A textile unit with steady daytime load has a different solar fit from a cold room, a school, a clinic or a packaging unit with irregular operation. The same rooftop capacity can behave differently in the bill because self-consumption and export pattern differ.
Before approving a proposal, ask:
- What happens to surplus generation during holidays?
- Is settlement monthly, annual or as defined by the current rule?
- Are there category limits or conditions?
- How is export shown on the bill?
- What meter change or testing is needed?
Avoid proposals that talk only about panel capacity and annual units. Policy treatment decides how many of those units become useful bill reduction.
How do DISCOM approvals affect project timelines?
DISCOM approvals are not a side formality. They connect the policy to your actual consumer number.
The process may involve application, technical feasibility, sanctioned load checks, meter replacement, net meter testing, inspection, agreement format and billing configuration. In some places, portal process is smooth. In others, document follow-up matters.
The solar EPC should prepare a clean document set:
- current bill
- sanctioned load or contract demand detail
- ownership or occupancy proof as required
- electrical single-line information
- inverter and protection details
- application acknowledgement
- meter change record
For pre-sales diligence, use the solar EPC bill analysis checklist.
Tips from the field
- Ask the EPC to identify the exact metering method applicable to your consumer number before discussing payback.
- Do not size rooftop solar from roof area alone, because sanctioned load, daytime consumption and export treatment can control the usable size.
- Keep DISCOM application acknowledgements and meter change documents with the bill file, because billing disputes often start later.
- Compare import, export and net bill lines for the first billing cycles after commissioning instead of trusting the inverter app alone.
- Treat banking as a regulatory feature, not a battery, because unused energy treatment is defined by rules.
- When the state rule changes, recheck assumptions before signing expansion or opex solar documents.
How does open access fit into rooftop conversations?
Rooftop solar, open access and group captive procurement are related but not the same. Rooftop solar uses your own site roof or premises-linked arrangement. Open access involves buying power through the network from another generator, subject to eligibility, metering, charges and approvals.
Some businesses compare rooftop capex, rooftop PPA, captive solar, group captive and open access in the same board meeting. That is fine, but the bill mechanics are different.
Rooftop decisions usually start with load profile, roof, sanction and net metering treatment. Open access decisions need eligibility, wheeling, banking, scheduling, settlement and contract advice.
What should owners monitor after commissioning?
After solar starts, monitor the DISCOM bill, not only the generation app. The app shows generation. The bill shows import, export, adjustment and payable impact.
Track:
| Item | Why it matters |
|---|---|
| Import energy | Grid dependence |
| Export energy | Surplus behavior |
| Net or adjusted energy | Billing treatment |
| Demand | Demand charges may remain |
| ToD rows | Timing impact |
For payback discipline, read solar payback mistakes in India.
Also check whether the first few bills after commissioning are provisional, estimated or corrected later. Solar billing can take time to settle after a meter change. If the first month looks odd, compare the meter record, commissioning date, export reading and bill period before escalating.
Rooftop solar is a strong tool when policy, load and billing are aligned. When they are not aligned, even a technically good plant can disappoint the owner because the bill does not behave like the proposal. Keep the policy file current, because local solar rules and DISCOM procedures are the ground truth for the next bill.