Group Captive Solar Vs Open Access: Which Model Saves More?
Comparing group captive solar and open access for your business? Here's how ownership, charges, and savings differ between the two models.
Large industrial consumers evaluating third-party solar power usually land on the same two options: group captive and open access.
Both let a business access solar electricity without owning a standalone plant outright. Both use the existing grid to deliver power from an off-site source. But the ownership structure behind each one changes the economics considerably, and picking the wrong one can mean leaving real savings on the table.
What Is Group Captive Solar?
In a group captive model, a consortium of consumers jointly holds equity, typically at least 26%, in a shared solar plant, and collectively consumes at least 51% of its output.
Each participating business effectively becomes a part-owner of the plant rather than just a buyer of its electricity.
Why this matters financially: this ownership stake generally qualifies the arrangement for exemption from cross-subsidy surcharge, one of the larger additional charges applied to consumers who source power outside their local DISCOM.
Which Solar Model Fits Your Business?
Capex, Opex PPA, or Open Access — get a site-specific recommendation with system size, savings, and payback in 24 hours.
What Is Open Access?
Under a standard open access arrangement, a business signs a Power Purchase Agreement with a solar developer and simply buys electricity, with no equity stake in the plant itself.
The developer owns and operates the plant independently. The consumer pays the agreed tariff, plus wheeling, transmission, and cross-subsidy charges, since there's no ownership stake to exempt the arrangement from them.
Group Captive Vs Open Access: The Real Differences
Ownership
Group captive requires equity participation (minimum 26%) in the plant. Open access requires no ownership at all, it's a pure electricity purchase.
Cross-Subsidy Surcharge
Group captive structures typically qualify for exemption from this charge. Open access consumers pay it in full, since they hold no equity stake to justify an exemption.
Capital Commitment
Group captive requires the consortium to fund its equity share upfront. Open access requires no capital investment from the consumer at all.
Complexity
Group captive involves forming or joining a legal entity (usually an SPV), coordinating with other consortium members, and maintaining the 51% consumption threshold. Open access is comparatively simpler, a single PPA between one consumer and one developer.
Risk If Circumstances Change
In group captive, if one consortium member exits or the 51% consumption rule is violated, the exemption can be revoked retroactively, affecting all members. Open access carries no such shared risk, since each consumer's arrangement is independent.
Indian factory owner at a desk reviewing two contract folders side-by-side — group captive structure and open-access PPA — with a solar plant visible through the window.
Which One Actually Saves More?
On paper, group captive usually wins on pure cost, since avoiding cross-subsidy surcharge alone can meaningfully lower the landed cost per unit, especially for high-consumption facilities where even a modest per-unit saving compounds into a large annual number.
But that lower cost comes with real strings attached: capital commitment, governance complexity, and shared exposure to other consortium members' decisions.
Open access trades some of that savings for simplicity. No equity to manage, no consortium to coordinate with, and no retroactive risk if another party's circumstances change.
Indian corporate campus at golden hour with a large rooftop solar array on the main building and employees walking through the entrance courtyard.
Which Model Fits Your Business?
Group captive tends to make sense when:
- The business has capital available to commit as equity
- It operates in a high cross-subsidy surcharge state, where the exemption meaningfully impacts overall savings
- It's comfortable navigating shared governance with other consortium members over a long-term horizon
Open access tends to make sense when:
- The business wants renewable power with no equity commitment or added complexity
- The state's cross-subsidy surcharge is relatively low, narrowing the financial gap between the two models
- The business prioritizes flexibility over squeezing out the last percentage point of savings
Questions buyers ask us.
Group captive requires equity ownership in the solar plant, which typically exempts the consumer from cross-subsidy surcharge. Open access requires no ownership, but the surcharge applies in full.
Usually, but not always. It depends on how high the cross-subsidy surcharge is in that state and whether the savings justify the added capital and governance complexity.
No. Open access is a straightforward power purchase arrangement with no equity investment required from the consumer.
It can jeopardize the 51% consumption threshold required for the exemption, potentially triggering the cross-subsidy surcharge retroactively for all remaining members.
Open access, since it only involves a single PPA between the consumer and developer, without the added structure of forming or joining a consortium.
Choosing between group captive and open access isn't a checklist decision, it's a trade-off between savings and simplicity that plays out differently for every business.
PowerMore walks through both models against a business's actual state, tariff structure, and appetite for capital commitment before recommending either one, so the decision holds up years into the agreement, not just at signing.
Speak to our team to compare group captive and open access for your business.
