Answers to questions about AES Indiana's RFP process

AES Indiana has provided responses to all questions.

Sargent & Lundy accepted written questions until the date identified in the project schedule. Respondents should refresh their browser cache in the event of website updates not being displayed.

If you experience technical issues accessing RFP documentation or submitting documents, please contact for assistance. Respondents should not contact AES Indiana directly.

Questions & answers

The 2023 ASRFP narrative has been revised to reflect that the collateral amount for the operating security of a PPA should be the lesser of $200/kW or 12 months expected revenues.

AES Indiana will accept competitive proposals for energy and capacity available during the 2025-2026, 2026-2027 and 2027-2028 MISO Planning Years.

Respondents are encouraged to select either AC or DC coupling based on optimal performance and economics.

At this time there is no preferred form of a Procurement Plan. As noted in the RFP narrative, Respondents should provide a Procurement Plan including all major equipment relevant to the proposed project.

Respondents should provide a complete package submission for the 2023 ASRFP, including a signed NDA. (Appendix A of the RFP)

AES Indiana will accept redlines to the NDA. These redlines are due with proposals.

A certificate of insurance is proof of your business insurance coverage. It should include:

  • The business name, address and phone number.
  • The business owner’s name.
  • The name of the insurance company and contact information.
  • Your policy number(s).
  • Your policy expiration date.
  • The amount your insurance policy will pay for individual claims, as well as the maximum amount you are eligible to claim for the year.
  • Names and contact information of any other individuals listed on the policy.

As part of the RFP process, AES Indiana sees only the shortlisted proposals.

Section 4.6 of the RFP states that "[g]enerally, proposals with the same project characteristics (e.g., site, technology, size, etc.) but only offering a different structure (e.g., asset transfer or PPA) will be considered one proposal." Therefore, the example provided in the question would be considered as two proposals.

There is no requirement for the project(s) to be located in AES Indiana’s service territory. However, preference will be given to Indiana projects that can provide capacity in MISO Zone 6.

AES Indiana is interested in both Asset Transfers and PPAs. AES Indiana does not have a specific mix in mind.

AES Indiana’s economic analysis captures capacity and energy arbitrage but not ancillary services.

AES Indiana has a strong preference for projects that are settled at the IPL.IPL node or at the Indiana Hub.

AES Indiana will accept proposals from stand-alone battery projects. The corresponding contract templates have been published in the RFP documents section of the 2023 AES Indiana ASRFP website.

AES Indiana has included the Informational webinar presentation in the RFP documents section of the 2023 AES Indiana ASRFP website. AES Indiana requests that any questions concerning this RFP be submitted in writing via the RFP Question Form below.

For ATA proposals, yes, that is correct. AES Indiana is indifferent regarding overbuild or augmentation for PPA proposals assuming performance guarantees are in place and met. Generally, AES Indiana’s preference is to have no augmentation in the first three years of operation.

Bidders can propose an augmentation schedule. Generally, AES Indiana’s preference is to have no augmentation in the first three years of operation.

For PPA proposals, it is measured at the POI. For ATA proposals, this is a topic to be discussed and negotiated.

These fields are intended to provide an opportunity to report battery OEM operational constraints.


Please refer to definition and formula in the Data Reporting Instructions Appendix F,  provided for NERC Generating Availability Data System (GADS).


From a technical configuration standpoint, grid charging is allowed and there are no limitations on charging, such as specific percentages or charging times.

AES Indiana has revised Appendix J. Power Purchase Agreement Contract Template to remove the requirement for the BESS to be charged by the solar energy from the PV Plant. The revised Appendix J is located in the RFP Documents section of the AES Indiana 2023 ASRFP website.

Solar plus storage projects are not required to be DC-coupled.

Additional resources

RFP overview

All about the 2023 BESS RFP.

Project schedule

RFP milestone dates and deadlines.


Read RFP questions and answers.