Open Access Solar for Industries: A Complete Guide for 1 MW+ Consumers

For industrial consumers with electricity demands above 1 MW, rooftop solar alone may not meet the full energy requirement — the rooftop simply isn't large enough. Open access solar is the mechanism that allows large consumers to source power directly from a solar plant (on their premises or remotely) outside the standard DISCOM supply arrangement. This guide explains the framework for Telangana and AP.

What Is Open Access?

Open access is a regulatory right under the Electricity Act, 2003, that allows consumers with a contracted demand of 1 MW or above to purchase electricity from a generator of their choice, using the existing transmission and distribution network. For solar, this typically means either: (1) Captive solar — a solar plant on your own premises or at a nearby site, connected directly to your switchyard; or (2) Group captive — you hold a minimum 26% equity in a solar SPV and source at least 51% of the plant's output. Both avoid the DISCOM's retail tariff for the units sourced, replacing it with a combination of the solar generation cost plus applicable open access charges.

Open Access Charges in Telangana

The cost advantage of open access solar versus grid supply is determined by the net of: (a) Solar PPA rate (₹2.5–3.5/unit for long-term PPAs depending on plant size); (b) Wheeling charges (applicable TSSPDCL voltage-level wheeling charge); (c) Cross-subsidy surcharge (CSS — a significant charge designed to recover the subsidy TSSPDCL provides to domestic and agricultural consumers from HT industrial consumers); (d) Transmission charges; (e) Scheduling and deviation settlement charges.

For many HT-1 industrial consumers in Telangana, the cross-subsidy surcharge alone can be ₹1.0–2.0/unit — substantially eroding the open access advantage. ARIA Green Energy conducts a detailed open access economics analysis before recommending this model, comparing the effective delivered cost of open access solar against the all-in grid tariff for your specific consumer category and load profile.

The SLDC Registration Process

Open access solar in Telangana requires registration with the State Load Despatch Centre (SLDC) — the entity responsible for grid scheduling and balancing. The process involves: (1) Applying to TGERC/TSSPDCL for open access approval; (2) Executing a wheeling agreement with TSSPDCL; (3) SLDC registration for both the solar plant and the consumer drawl point; (4) Setting up daily generation scheduling (Day-Ahead Scheduling with 15-minute blocks); (5) Deviation settlement mechanism registration. This process typically takes 3–6 months and involves significant documentation — ARIA coordinates the regulatory approvals as part of the group captive and open access project development service.

When Does Open Access Make Sense?

Open access solar is most economically compelling for consumers: (a) with contracted demand above 2 MW (spreading the fixed compliance costs over a larger load); (b) operating in HT-I / HT-II industrial categories with high cross-subsidy surcharge immunity (some categories are exempt); (c) interested in group captive structures that carry additional benefits such as RPO compliance and greater pricing flexibility. For consumers below 1 MW or those whose economics are marginal after OA charges, rooftop solar combined with BESS is typically the superior option — and ARIA will say so directly rather than oversell open access complexity.