The proposal would allow state regulators to approve multiyear rate increases based on projected spending.
The utility was scheduled to file its latest 20-year integrated resource plan in Indiana on July 1.
Critics wanted the state Utilities Commission to gather more evidence before deciding on the long-range resource plan.
Multiyear ratemaking should be paired with performance goals or metrics that encourage clean energy, groups say.
Clean energy advocates want legislation that would allow securitization for refinancing aging coal plant debt.