Solar RECs: How Indian Factories Trade Green Certificates

Key Takeaways

• A Renewable Energy Certificate (REC) represents 1 MWh (1,000 units) of electricity generated from a renewable source such as solar — it is a tradable financial instrument separate from the physical electricity
• RECs trade on the Indian Energy Exchange (IEX) and Power Exchange India Limited (PXIL) on the last Wednesday of every month
• As of 2023, CERC removed the floor price for RECs — the market is now fully demand-supply driven, with a ceiling price of ₹1,000/MWh for solar RECs
• The all-India Renewable Purchase Obligation (RPO) target is approximately 43% for FY 2025-26, creating strong structural demand for RECs from obligated entities (DISCOMs, large captive consumers)
• Industrial solar plant owners can earn RECs and sell them monthly — providing a second revenue stream on top of electricity savings
• RECs and Carbon Credit Certificates (CCCs under India's CCTS) are distinct instruments serving different compliance purposes; a solar plant can earn both

Most industrial buyers install solar to cut electricity bills. Fewer realise their solar plant can also generate Renewable Energy Certificates (RECs) — tradable instruments that obligated entities (power distribution companies, large industries with captive consumption) must buy to meet their Renewable Purchase Obligation. For factory owners with rooftop or captive ground-mount solar, RECs represent a monetisable byproduct of every megawatt-hour generated.

This guide explains how RECs work, who can earn them, how to register, what they trade for, and why demand is only growing in 2026.

What Is a Renewable Energy Certificate (REC)?

A Renewable Energy Certificate is a market instrument that certifies the environmental attributes of one megawatt-hour (1 MWh = 1,000 units) of electricity generated from a renewable source. Under India's REC framework, governed by the Central Electricity Regulatory Commission (CERC) and administered by POSOCO (now National Load Despatch Centre, NLDC), each REC represents:

• 1 MWh of renewable electricity actually generated and fed into the grid (or consumed behind the meter)
• A unique serial number registered on the National REC Registry
• The right for the buyer to claim the renewable attribute toward their RPO compliance

The physical electricity and the environmental certificate are unbundled — a solar plant owner can sell the electricity (or consume it) and separately sell the REC to a third party. This unbundling is what makes RECs tradable.

India has two categories of RECs: solar RECs (from solar plants) and non-solar RECs (from wind, small hydro, biomass, etc.). Solar RECs historically traded at a premium to non-solar RECs due to India's specific solar RPO targets, though the gap has narrowed as solar supply has grown.

Who Must Buy RECs? Understanding RPO

The Renewable Purchase Obligation (RPO) requires certain entities to source a mandated share of their electricity from renewable sources:

• Distribution companies (DISCOMs) must meet state-level RPO targets for the electricity they supply
• Open access consumers (large industrial buyers who bypass the DISCOM and buy power directly) must also meet RPO targets independently
• Captive power plant owners above a certain threshold in some states have standalone RPO obligations

For FY 2025-26, the all-India blended RPO target is approximately 43% of total electricity consumption, up from 29.91% in FY 2022-23. This stepped-up target creates strong, growing demand for RECs from obligated buyers who cannot meet their RPO entirely from owned renewable assets or direct PPAs.

When a DISCOM or large industrial buyer cannot procure enough renewable energy physically (through owned assets or PPAs), they purchase RECs on the exchange to meet their compliance obligation. This is the structural demand driver for India's REC market.

Who Can Earn and Sell RECs?

Solar plant owners who want to earn RECs must meet three core eligibility criteria under the CERC REC framework:

1. Eligible Renewable Energy Generator

The solar facility must be registered with the State or Central Electricity Regulatory Commission as a renewable energy generator. Standard grid-connected rooftop systems, captive ground-mount plants, and open access plants all qualify, provided they meet state registration requirements.

2. Energy Not Already Counted Toward Another Entity's RPO

This is the most important condition. The electricity generated must not already be attributed to any state's RPO through a direct DISCOM purchase or a green power PPA where the buyer is already claiming the renewable attribute. In simple terms: if you sell solar power to a DISCOM and they count it toward their RPO, you cannot also issue a REC for the same energy. You must choose: sell the electricity as "green" (and let the buyer claim the attribute), or sell it as ordinary electricity and retain the REC.

For captive solar plants where the factory consumes its own power, the factory owner can typically issue RECs for the portion of generation consumed internally, subject to state SERC approvals.

3. Registered on the National REC Registry

Generators must register on the REC Registry maintained by NLDC/POSOCO at recregistryindia.nic.in. Accreditation by the State Nodal Agency and verification by the State Load Despatch Centre is required before RECs can be issued.

How the REC Issuance and Trading Process Works

The lifecycle of a solar REC has four stages:

Step 1 — Accreditation

Apply to the State Nodal Agency (SNA) designated by your state SERC. The SNA verifies plant eligibility and accredits the generator. This typically takes 2–6 weeks.

Step 2 — Registration on NLDC Registry

Once accredited, register the plant on the national REC Registry. The Registry assigns unique unit IDs to each metered generating unit.

Step 3 — Monthly REC Issuance

After generation, submit generation data monthly to the State Load Despatch Centre (SLDC). The SLDC verifies the data, and RECs are issued in proportion to actual generation — 1 REC for every 1 MWh generated.

Step 4 — Sell on the Exchange

List RECs for sale on IEX or PXIL during the monthly REC trading session (last Wednesday of each month). Exchange fees are approximately 1–2% of transaction value. Settlement happens through the REC Registry, which transfers the REC from the seller's account to the buyer's account upon payment confirmation.

REC Prices in India (2026)

Current Price Structure

Following the CERC's decision in 2023 to remove the floor price, REC trading in India is now fully market-determined, with only a ceiling:

• Ceiling price (cap): ₹1,000 per MWh for both solar and non-solar RECs
• Floor price: Removed — market clears at whatever buyers and sellers agree, up to the ceiling

This change made REC prices more volatile but also more reflective of actual supply-demand conditions. Prices at any given session depend on the volume of RECs listed, the number of obligated buyers present, and seasonal compliance cycles (DISCOMs and large consumers tend to buy more aggressively near state-level compliance deadlines).

Market Size and Liquidity

The REC market has grown significantly. Trading volume reached approximately 1.74 million RECs in May 2025, and the Indian renewable energy certificates market was valued at approximately USD 572 million in 2024. Market projections indicate growth at a compound annual rate of ~26% through 2033, driven by rising RPO targets and growing industrial awareness of REC monetisation.

A key factor driving REC demand in 2026 is the increase in obligated entities — as more large industrial buyers adopt open access solar, they simultaneously take on their own RPO compliance obligation, becoming potential REC buyers for any shortfall.

Calculating REC Revenue for Your Solar Plant

A rough estimate for an industrial solar plant:

A 1 MW ground-mount solar plant in a location with 4.5–5 peak sun hours per day will generate approximately:

• 1,600–1,800 MWh per year (accounting for system losses, CUF of 18–20%)
• At current REC market prices (market-driven, historically in the ₹200–₹1,000/MWh range), a generator might earn ₹3.2 lakh to ₹18 lakh per year in REC revenue alone from a 1 MW plant

The actual realisation depends entirely on market conditions at the monthly session. Generators with long positions may choose to sell gradually over multiple sessions rather than flooding a single session.

For 100 kW rooftop solar plants, annual REC generation is approximately 160–180 RECs (MWh), generating proportionate REC revenue.

Note: Verify current clearing prices on IEX or PXIL before any commercial decision — prices can vary significantly between trading sessions.

RECs vs Carbon Credit Certificates (CCCs) Under CCTS

Industrial buyers often ask how RECs relate to India's newer Carbon Credit Trading Scheme (CCTS) and the Carbon Credit Certificates (CCCs) it issues. These are distinct instruments:

A solar plant in India can theoretically earn both RECs (for the renewable electricity attribute) and CCCs (for the carbon displacement attribute) from the same generation, subject to double-counting rules and registry conditions. If you are exploring both instruments, consult with a certified climate or energy consultant.

For more on carbon credits from solar plants, see our guide on Carbon Credits from Solar India: CCTS Guide for Industrial Buyers.

State-Level RPO Targets and Their Impact on REC Demand

India's RPO framework has both central guidelines and state-specific targets. Key states relevant to Sun Wave Technologies' industrial clients:

• Haryana: HERC sets annual RPO targets; large industrial consumers (above 1 MW connected load) have independent RPO obligations under open access. Haryana is an emerging market for REC purchases as open access adoption grows.
• Rajasthan: One of India's largest renewable energy states; RERC RPO targets align with national trajectory. Rajasthan DISCOMs are significant REC buyers.
• Uttar Pradesh: UPERC has steadily raised RPO targets; large C&I consumers in UP buying open access power are taking on their own RPO obligations and may need RECs to top up.
• Gujarat: GERC RPO framework is well-established; GUVNL and captive consumers are active REC market participants.

As obligated entities in these states face higher annual RPO targets, REC demand will structurally increase — supporting prices for solar generators who choose to monetise RECs rather than bundling the green attribute into their PPA price.

Who Should Consider REC Registration?

Not every solar plant owner benefits equally from REC registration. Consider it if:

Good candidate:

• You have a captive ground-mount or rooftop plant and consume the power internally (you are not selling it to a DISCOM or under a green PPA where the buyer claims the renewable attribute)
• Your plant is above 100 kW (registration overhead is less justifiable for smaller systems)
• You want a secondary revenue stream beyond electricity savings
• You are in a state where REC demand is high (Gujarat, Rajasthan, Karnataka, Maharashtra)

Less suitable:

• You sell solar power to a DISCOM under a PPA where they count it toward their RPO — in this case, the green attribute has already been transferred
• You have an open access PPA with a green buyer who claims the renewable attribute in their sustainability reports — same issue
• Your plant is very small (below 100 kW) and the administrative overhead of registration may not justify the revenue

How Sun Wave Technologies Can Help

Sun Wave Technologies installs industrial solar plants across Delhi-NCR, Haryana, Rajasthan, UP, Gujarat, and Maharashtra. For clients who own their solar plant (CAPEX model), we can guide you through:

• Evaluating REC eligibility for your specific plant and offtake arrangement
• Connecting with accredited REC intermediaries who handle registration and trading on your behalf (for a fee)
• Structuring your PPA (if selling power to a third party) to retain the REC attribute where possible, so you can monetise it separately

If you are still evaluating which solar model is right for your factory — CAPEX, RESCO/OPEX, or Open Access — see our comparison guide: CAPEX vs OPEX vs Open Access Solar for Industries.

And for understanding how your solar investment's financial returns stack up including RECs, see: Solar Panel ROI and Payback Period for Indian Industry.

The Open Access Connection

If you purchase power through Open Access Solar from an off-site solar farm, you are both:

1. Consuming renewable energy (which you may report in sustainability disclosures)
2. Taking on an independent RPO obligation for the open access quantum (in most states)

This means open access buyers may need to purchase RECs to cover any RPO shortfall — making them buyers rather than sellers in the REC market. Understanding this distinction before signing an open access PPA is important for total cost modelling.

For more on open access solar for industries: Open Access Solar India: Complete Guide for Industrial Buyers.

Frequently Asked Questions

Q: What is the minimum plant size to register for RECs in India? There is no prescribed minimum size under the CERC REC framework, but practically, the registration and trading overheads make REC monetisation most worthwhile for plants above 100 kW. For plants below 100 kW, the administrative cost (agency fees, registration time, monthly listing fees) can erode the financial benefit.

Q: Can a rooftop solar plant earn RECs? Yes — rooftop solar plants are eligible for REC registration provided the electricity is consumed internally (not sold to a DISCOM under a net metering arrangement where the DISCOM claims the green attribute). Many plant owners on gross metering arrangements can register and earn RECs. Confirm with your state SERC before registering.

Q: How often are RECs traded and when do I get paid? REC trading sessions are held on the last Wednesday of every month on IEX and PXIL. Settlement (payment to the seller) occurs within a few working days after the trading session through the exchange's clearing mechanism.

Q: What happens if my RECs don't sell in a given month's session? Unsold RECs remain valid in your account and can be listed in subsequent monthly sessions. CERC regulations specify a validity period for RECs — check the current regulations for the applicable validity window, as this has been revised over time.

Q: Is the REC ceiling price of ₹1,000/MWh the price I will receive? Not necessarily. The ceiling is the maximum permissible price — actual clearing prices are set by supply and demand at each session. When RPO compliance pressure is high (near state compliance deadlines), prices tend to move closer to the ceiling. When supply is abundant, prices can be much lower. There is no guaranteed price.

Q: Can my solar plant earn both RECs and carbon credits? In principle, yes — RECs cover the renewable electricity attribute (counting toward RPO) and carbon credits cover the GHG displacement attribute (counting toward CCTS obligations). They serve different compliance purposes. However, specific double-claiming restrictions may apply depending on the registry and your plant's registration status. Consult a certified environmental consultant.

Q: What is the difference between a solar REC and a green certificate (I-REC)? India has its own domestic REC framework (issued under CERC/NLDC). Internationally, some companies use I-RECs (International Renewable Energy Certificates) for global sustainability reporting. These are separate instruments. I-RECs are not used for Indian RPO compliance but may be used for voluntary corporate sustainability disclosures under GHG Protocol standards.

Q: Do I need an intermediary or can I trade RECs directly? You can trade directly on IEX or PXIL by registering as a market participant. However, many small and mid-size industrial plant owners use accredited REC intermediaries or trading advisors who handle registration, issuance, and trading for a service fee (typically 2–5% of REC revenues). For larger plants, direct market participation is often more economical.

Final Summary: Key Takeaways for Industrial REC Buyers

The most important distinction every industrial REC buyer must understand: RECs serve RPO compliance obligations, while Carbon Credit Certificates (CCCs) under the CCTS serve GHG emission intensity obligations. They are complementary — not interchangeable.

In short, for industrial buyers with captive solar looking to maximize financial returns: sell RECs from your captive solar plant to obligated entities for RPO compliance income, while separately registering for CCTS voluntary offset credits. The bottom line is that this dual-instrument strategy generates the highest combined revenue per unit of solar generation.

The key result from IEX trading data: REC prices are highest at quarter-end compliance windows — time your REC listings to coincide with state SERC compliance reporting periods (typically March and September) for best price realization.

Sources

• CERC / NLDC National REC Registry: recregistryindia.nic.in
• Tristar Energy — Solar REC Trading Guide: tristarenergy.in
• Mercom India Q1 2026 India Solar Open Access Market Report (May 21, 2026)
• Sunphotonics — Industrial REC Compliance Guide 2026: sunphotonics.com
• Avaada — Renewable Energy Certificates India Guide: avaada.com