Open Access (Solar)
Open access lets a consumer buy power from a generator other than the DISCOM — typically an off-site solar plant — wheeled through the grid; the Green Energy Open Access Rules, 2022 opened it to consumers from 100 kW contracted demand, with state charges setting the landed economics.
Why it matters on an MEPF project
Rooftops cap out; consumption does not. Open access serves the demand your roof cannot, at savings per unit that are smaller than behind-the-meter solar but apply to much larger volumes. The 100 kW threshold brought mid-size factories into a market once reserved for MW-scale consumers — structurally one of the biggest recent shifts in industrial energy buying.
The economics live in the charges: wheeling and transmission, cross-subsidy surcharge, additional surcharge, banking rules and losses convert a headline PPA into a landed rate — and captive/group-captive structures (equity participation meeting the statutory tests) can waive the CSS, often the largest single line. Every one of these is state-order-specific and revisable; diligence means pricing the current orders, not last year's deck.
How it's specified in practice
| Parameter | Typical / working position | Governing reference |
|---|---|---|
| Eligibility | 100 kW+ contracted demand (green energy OA) | GEOA Rules, 2022 |
| Charges stack | Wheeling + transmission + CSS + additional surcharge + losses + banking | state orders |
| Structures | Third-party PPA vs captive/group-captive (CSS treatment differs) | Electricity Rules (captive tests) |
| Banking | State-specific permissions/deductions | state orders |
Common mistakes
- Comparing PPA sticker price to your retail tariff — landed vs landed is the only honest comparison.
- Ignoring charge-revision risk over a long PPA.
- Structure chosen by template rather than the CSS math.
- Banking assumptions imported from another state.
Related on this site
One of 68 working definitions in the MEPF & solar engineering glossary. The buying side of the same decisions is in the buyer's guides; the numbers are in the calculators.
Frequently asked
Rooftop or open access — which first?
Rooftop first almost always: full retail offset, no wheeling stack. Open access then serves the remainder. Most large consumers end with both — our open-access calculator frames the second leg honestly.
What is group captive?
A structure where consumers hold the statutory equity share in the generating plant and consume the required share of its output — earning captive status and, under current rules, relief from cross-subsidy surcharge. It is a legal-financial construct that must be built correctly to survive scrutiny.
Standards referenced: Green Energy Open Access Rules, 2022 · state regulatory orders