Can a state regulation really wipe out solar Open Access PPA savings after signing?

Yes. Six months after this Maharashtra firm signed, the state banned banking daytime solar generation against nighttime use. Its multi-shift plant had no BESS, so under the take-or-pay clause it paid for 75 lakh unusable units. The ₹4 Cr annual savings vanished and the 90% IRR fell to 9%.

Why does a solar PPA need a Change in Law clause before signing?

Without a robust Change in Law clause, regulatory penalties cannot be passed through or the contract renegotiated. In this case the developer stayed protected by take-or-pay while the automotive buyer absorbed 100% of the risk when Maharashtra's banking rule changed, converting a projected ₹60 Cr gain into a loss.

Should corporate buyers pick a solar PPA on IRR or on risk protection?

On risk. This deal was negotiated for maximum initial savings, not regulatory defence, so a 90% IRR collapsed to 9%. Infinia advises buyers to stress-test every PPA across five risk buckets, including PPA/SHA risk covering Change in Law, CSS hikes and captive compliance, before signing.

₹60 Cr Savings Wiped Out. 75 Lakh Units Wasted. The Solar PPA Trap.

Published 23 April 2026

Executive Summary

Securing a 90% Internal Rate of Return (IRR) on an Open Access Solar PPA feels like a massive corporate victory. But in the Renewable Energy sector, PowerPoint projections are dangerously fragile.

When the CFO of a Maharashtra-based automotive company signed a 10 MW solar Open Access PPA in 2025, the board applauded the projected ₹60 Crore in lifetime savings. But within just six months, a single regulatory shift wiped out those savings, wasted 75 Lakh units of power, and collapsed the 90% IRR down to a mere 9%.

Here is exactly how a failure to stress-test regulatory risks destroyed a highly lucrative energy contract, and the 5-bucket risk framework every corporate consumer must deploy to prevent this from happening to their balance sheet.

The 90% IRR Illusion

The initial presentation the CFO made to the board was mathematically flawless based on the existing regulations. The 10 MW Open Access agreement promised massive financial relief:

1.5 Crore units of conventional power replaced.
₹4 Crore in direct annual savings.
₹60 Crore in total lifetime savings.
A 12-month payback period with a 90% IRR.

Attracted by the ₹3 per unit savings, the board approved the PPA. The company locked into a strict “take-or-pay” commitment with the developer, assuming the grid banking regulations would remain static.

The Regulatory Collapse: The Daytime Banking Trap

Six months after signing, the state of Maharashtra changed its grid regulations. The new rule was highly specific: daytime solar generation could no longer be banked and settled against nighttime consumption.

Because the automotive plant operated across multiple shifts, this regulatory shift was catastrophic. Without a Battery Energy Storage System (BESS) in place to store the power, the company was legally forced to pay the developer for daytime generation they could not use, while still buying expensive grid power at night.

The fallout was brutal:

75 Lakh units of solar power were entirely wasted.
The ₹4 Crore annual savings evaporated.
The 90% IRR crashed to 9%.

The Boardroom Reality Check

When the management board demanded an explanation, the answer was painful but simple: The PPA was negotiated for maximum initial savings, not for regulatory defence.

The contract lacked a robust “Change in Law” clause that allowed regulatory penalties to be passed through or renegotiated. The developer was protected by the take-or-pay clause, leaving the automotive company holding 100% of the financial risk.

As a renewable-energy advisory, we consistently see Open Access Wind-Solar Hybrid solutions marketed purely on return. But the true game for a corporate consumer is not to chase the return—it is to mitigate the risk.

The 5-Bucket PPA Risk Framework

You cannot depend on a developer’s financial model without independently stress-testing the contract. Before signing any PPA, you must mandate a legal and commercial audit across these 5 exact risk buckets:

RE Developer Risk: Is the developer financially solvent enough to actually commission the project?
RE Capacity Risk: Will the plant actually generate the specific CUF (Capacity Utilisation Factor) promised in the term sheet?
PPA / SHA Risk: Are you protected against Change in Law, Cross Subsidy Surcharge (CSS) hikes, and captive compliance failures?
Project Monitoring Risk: Who audits the actual generation vs. billed generation once the plant goes live?
Bill Validation Risk: How do you ensure the DISCOM is correctly crediting the solar units to your monthly grid invoice?

Next Steps for the C-Suite

Knowing about the risk is 70% of the mitigation.

If your company is evaluating an Open Access Term Sheet and you want us to run a Techno-Commercial Wealth Audit to stress-test your contract against regulatory shifts and take-or-pay traps before you execute it:

Get a PPA read before you sign

Send us the PPA, tariff sheet, or EPC quote you are about to sign. We will stress-test the numbers and tell you where the risk actually sits — before you sign, not after.

Send us your PPA to stress-test

In the read, we will audit your exact term sheet so you can walk into your next Board meeting with a legally and mathematically unassailable energy strategy.

About Infinia Solar

Infinia Solar is India’s #1 Corporate & IPP Renewable Energy Advisory. We help large Commercial & Industrial buyers procure the right renewable energy — from the right developers, on the right PPA terms — with every clause decoded before it is signed. We also advise independent power producers on market entry, PPA structuring and exit-ready contracts.

We’ve advised 70+ corporates across 20+ states, enabling 2 GW of solar, wind and hybrid capacity and ₹8,000 Cr+ of projects across 157+ PPAs with 40+ developers — and zero defaults in 7 years.