Open Access Renewable Electricity: Why the State You’re In Determines the Rs 1.50–2.00/Unit Cost Gap
India’s lowest solar auction tariff is under Rs 2.50/unit. An industrial open access buyer in the wrong state pays over Rs 6.50/unit for that same electricity after charges. The cross-subsidy surcharge, wheeling fees, banking policy, and approval timeline — not the solar tariff — decide whether open access RE is competitive with coal. This is the analysis that should precede every industrial RE procurement decision.
Key Takeaways
- The landed cost of open access renewable electricity for an industrial consumer is the sum of four components: the PPA or auction tariff (the solar generation cost), the wheeling charge (for using the state distribution network to wheel the power), the cross-subsidy surcharge (a levy on open access buyers to cross-subsidise subsidised consumers), and transmission losses (a percentage of energy that is deducted in transit). The CSS and wheeling charge are the decisive variables — the solar tariff is set at national competitive auction levels and is broadly similar across states, but the state-determined CSS and wheeling charge create a Rs 1.50 to 2.00 per unit difference in landed cost between the best and worst states.
- Odisha — home to India’s largest aluminium smelting cluster — provides a 50 percent exemption on cross-subsidy surcharge for open access renewable energy procurement, making it one of the most competitive industrial RE procurement states in the country. At this CSS exemption level, the landed cost of solar open access in Odisha for a large industrial buyer is approximately Rs 3.50 to 4.50 per unit — cost-competitive with the operating cost of coal captive power plants in the same state and well below the coal CPP replacement cost.
- Rajasthan — India’s highest-irradiation state and the location of many large utility-scale solar projects — has a well-developed open access framework with competitive wheeling charges and a CSS structure that, while not as favourable as Odisha’s, still allows landed costs of approximately Rs 3.50 to 4.80 per unit for large industrial buyers. The ISTS waiver for inter-state renewable procurement additionally removes transmission charges for buyers in other states procuring Rajasthan solar — making Rajasthan a viable source of competitively priced RE for industrial consumers across North India.
- Maharashtra — India’s largest industrial state — has historically had a more challenging open access environment due to MSEDCL’s resistance to competitive procurement that reduces their captive load. Cross-subsidy surcharges in Maharashtra are among the highest in India, and banking restrictions limit the ability of industrial consumers to time their renewable consumption against their production patterns. The effective landed cost of open access RE for industrial consumers in Maharashtra is approximately Rs 5.50 to 7.00 per unit — in some tariff categories approaching the delivered cost of grid electricity from MSEDCL itself.
- The Green Energy Open Access Rules 2022, notified by the Ministry of Power, were intended to standardise and simplify open access across all states — reducing the minimum procurement threshold from 1 MW to 100 kW, mandating defined approval timelines, and prohibiting arbitrary denial of applications. State implementation of these rules has been uneven. States where DISCOMs have a stronger financial interest in retaining industrial load — Maharashtra, Tamil Nadu — have been slower to implement the spirit of GEOA. States where industrial electricity consumption is a smaller share of DISCOM revenue — Rajasthan, Odisha — have been more facilitative.
- The CCTS Scope 2 GEI implication of state open access policy is direct and measurable. A 500 MW aluminium smelter in Odisha that switches from coal CPP to open access solar at the state’s 50 percent CSS exemption reduces its Scope 2 GEI from approximately 0.90 tCO₂/MWh (coal CPP) to approximately 0.02 tCO₂/MWh (solar) for the switched electricity volume — a 97 percent Scope 2 reduction per kWh, simultaneously improving CCTS GEI and CBAM embedded emissions. The same switch in Maharashtra, where the higher landed cost may not justify switching, leaves the CCTS and CBAM liability in place.
The phrase “open access renewable electricity” refers to the mechanism by which an electricity consumer — typically an industrial facility — procures power directly from a generator of its choice, using the existing distribution network to wheel the electricity from generator to consumer, rather than purchasing exclusively from the local distribution company at regulated tariffs. Open access has been legally available in India since the Electricity Act 2003, but the practical economics of open access procurement depend not on the Act’s provisions but on the state-level charges and conditions that SERCs impose — which vary dramatically across states and which have historically been the primary tool through which DISCOMs defend their industrial load against competitive procurement.
The Green Energy Open Access Rules 2022 represented the central government’s most significant intervention in this dynamic. By setting minimum timeline mandates for approvals, reducing the minimum procurement threshold from 1 MW to 100 kW, and creating a framework for deemed approval where states fail to process applications on time, the GEOA Rules created a legal basis for challenging the informal delays and additional charges that some states had used to discourage open access adoption. Three years after the GEOA Rules notification, their practical impact has been differentiated — positive in states that were already facilitative, minimal in states where DISCOMs had political and financial reasons to resist.
The five-state analysis: where the economics work and where they do not
Generation tariff: Typically Rs 2.20–2.80/unit for utility-scale solar PPA (competitive procurement) Wheeling charge: State-set, typically Rs 0.40–1.20/unit depending on voltage level and state Cross-Subsidy Surcharge: State-set, typically Rs 0.80–3.50/unit for industrial consumers; exemptions available in some states for RE Additional surcharge: Rs 0–0.30/unit in some states Transmission loss: 3.5–5.5% of units consumed, deducted at metering
Best-case (Odisha, 50% CSS exemption): Rs 2.50 + 0.50 + 0.60 (50% of 1.20) + 0 + ~0.14 loss = ~Rs 3.74/unit Worst-case (Maharashtra, full CSS): Rs 2.50 + 0.90 + 3.20 + 0.20 + ~0.18 loss = ~Rs 6.98/unit
Open Access RE Landed Cost Comparison — Five Key Industrial States · April 2026 Estimates
| State | Key Industrial Sectors | CSS (Full) | RE CSS Exemption | Wheeling Charge | Approx. Landed Cost RE | CCTS/CBAM Implication |
|---|---|---|---|---|---|---|
| Odisha | Aluminium (Vedanta, NALCO, Hindalco), Steel | ~Rs 1.20/unit | 50% (RE Policy 2022) | Rs 0.40–0.60/unit | Rs 3.50–4.50/unit | Solar competitive with coal CPP; CCTS Scope 2 + CBAM improvement immediate |
| Rajasthan | Cement, Chemicals, Fertilisers | ~Rs 1.80/unit | 25–30% for RE (varies by category) | Rs 0.50–0.80/unit | Rs 3.80–5.20/unit | Marginal vs coal CPP; strong case for inter-state ISTS to other states |
| Gujarat | Chemicals, Fertilisers, Textiles, Port industry | ~Rs 1.50/unit | 25% for RE in some categories | Rs 0.50–0.70/unit | Rs 4.00–5.00/unit | Competitive for large consumers; offshore wind potential adds long-term supply |
| Tamil Nadu | Cement, Textiles, Automotive, Chemicals | ~Rs 2.20/unit | Minimal; TNERC has been resistant to GEOA implementation | Rs 0.70–1.00/unit | Rs 5.20–6.20/unit | RE procurement challenging for most industrial categories; CCTS relief limited |
| Maharashtra | Steel, Chemicals, Pharmaceuticals, Textiles | ~Rs 3.20/unit | Very limited; MSEDCL has opposed exemptions | Rs 0.80–1.00/unit | Rs 5.80–7.00/unit | Open access RE rarely economic for most industrial categories; grid dependency continues |
The cost comparison above reveals a structural bifurcation in India’s industrial decarbonisation landscape. In Odisha, Rajasthan, and Gujarat — the three most RE-procurement-friendly large industrial states — open access solar is already cost-competitive with coal captive power for new procurement decisions. In Tamil Nadu and Maharashtra — two of India’s largest industrial states by GDP — the CSS environment makes open access RE significantly more expensive than coal grid or coal CPP electricity for most industrial consumers. This means that the decarbonisation investment case for aluminium, steel, and fertiliser companies in Tamil Nadu and Maharashtra is structurally weaker than for the same companies in Odisha — not because of any difference in the solar resource or in the carbon compliance obligation, but solely because of state regulatory decisions about how much to charge industrial buyers for the privilege of using the state’s wires to wheel electricity they procure themselves.
The policy arbitrage that is already reshaping industrial investment decisions. India’s aluminium expansion over the next decade will be disproportionately directed toward Odisha, not Maharashtra or Tamil Nadu — and the CSS environment is a primary reason. Vedanta’s decision to expand Jharsuguda rather than establish new smelting capacity in other states is at least partly explained by Odisha’s 50 percent CSS exemption. NALCO’s Angul plant and Hindalco’s Hirakud smelter both benefit from the same framework. If Tamil Nadu or Maharashtra want to attract industrial decarbonisation investment — which they will need to compete for as CBAM makes high-emission production increasingly uncompetitive — their SERCs must move on CSS reform. The GEOA Rules 2022 provide the legal framework. Political will to implement them against DISCOM resistance is the remaining variable.
Frequently Asked Questions
What is the cross-subsidy surcharge and why does it vary so much between states?
The cross-subsidy surcharge is a levy charged to industrial open access consumers to compensate the distribution company for the loss of a high-paying industrial consumer from its regulated tariff base. DISCOMs in India cross-subsidise agricultural and residential consumers by charging industrial consumers a higher tariff — when an industrial consumer leaves the DISCOM for open access, the DISCOM loses that cross-subsidy revenue. The CSS is the mechanism to recover some of that revenue from departing consumers. States with large agricultural sectors and politically sensitive power pricing — Maharashtra, Tamil Nadu — tend to have higher CSS levels because their DISCOMs are more dependent on industrial cross-subsidy revenue. States with smaller agricultural power subsidies — Odisha, Rajasthan — have lower CSS levels.
Does open access RE satisfy CBAM Scope 2 requirements for aluminium exporters?
Yes — physical open access procurement of renewable electricity reduces the CBAM Scope 2 embedded emissions of an aluminium smelter in proportion to the renewable electricity’s share of total consumption. Under CBAM Implementing Regulation, the embedded electricity emission factor can use the actual emission factor of the electricity source rather than the national average, provided the renewable procurement is physically verifiable (direct wire or metered open access delivery). This means that open access solar at Rs 3.50 to 4.50/unit in Odisha directly reduces CBAM embedded emissions — while REC purchases at the same volume do not. This is the financial incentive that makes physical open access procurement more valuable than REC-based compliance for CBAM-exposed producers.
What exactly did the Green Energy Open Access Rules 2022 change?
The GEOA Rules 2022 made three significant changes to the pre-existing open access framework. They reduced the minimum open access procurement threshold from 1 MW to 100 kW, expanding eligibility to mid-sized industrial and commercial consumers for the first time. They mandated that states process open access applications within defined timelines — 15 days for connectivity approval and 30 days for open access approval — with deemed approval if timelines are not met. And they introduced a green energy tariff option that allows consumers below the 100 kW threshold to opt for green electricity from their DISCOM at a slight premium. Implementation across states has been uneven, with some states complying faithfully and others creating administrative barriers despite the formal notification.
Sources
- Ministry of Power — Green Energy Open Access Rules, 2022 — full notification
- Odisha Electricity Regulatory Commission — Odisha RE Policy 2022 — CSS exemption framework and wheeling charges
- CERC — Open Access Regulations — inter-state transmission and ISTS waiver
- MNRE — Inter-State Transmission System charge waiver for RE projects
- Forum of Regulators — State-level RPO and open access framework comparison
Related Reclimatize.in Research
State Renewable Policies — Open Access Comparison CBAM and Indian Aluminium: Scope 2 Electricity Exposure and What Smelters Must Do Electricity Market and Open Access — Regulatory Repository India’s REC Market: Mechanics, Trading, and Price Signal India’s Grid Emission Factor: CEA Calculation and CCTS Scope 2 Impact