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    RFP Q&A

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    RFP Q&A

    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

    In the RFP document, Section 4.8, the operating security for a PPA is $200/MW. Should it be $200/kW?

    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.

    The RFP states that projects should be online for PY 2027-2028; will DPP 2022 projects be accepted through a COD prior to June 1, 2027 cannot be guaranteed at this time?

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

    Is there a preference for AC vs. DC coupled BESS systems?

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

    Is there a preferred form of Procurement Plan that will be provided?

    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.

    Does the NDA from the 2022 RFP apply to this 2023 process?

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

    Are redlines able to be submitted on Appendix A (NDA) or does the NDA have to be submitted as is & partially executed? If we can submit redlines, please advise if those should be submitted prior to the RFP due date.

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

    With regards to the requirement to submit a Certificate of Insurance, can you please clarify what specifically the Certificate of Insurance should cover?

    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.
    How is the information from bidders going to be shared with AES Indiana? Will AES Indiana see all the proposals or only the shortlisted ones? What is the level of anonymity? This is important for us to understand as AES have many companies that enable them to self-build.

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

    Could you provide more clarity on what counts as a “proposal”? For example, if a project with the same POI, queue position, and land has a solar proposal and a solar+storage proposal, is that viewed as one or two 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.

    What is the appetite for projects outside of AES’s service territory or potentially even in a different MISO Zone?

    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.

    Does AES Indiana have a preference for PPA or Asset Transfers or a specific mix in mind?

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

    How does AES value / model BESS storage? Is it viewed only as capacity or does AES value arbitrage, ancillary services, etc.?

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

    For PPA proposals, would AES Indiana accept pricing at the busbar rather settled at Indiana Hub?

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

    Can you please confirm if you will accept a proposal for a PPA or Tolling Agreement from a stand-alone battery project? If so, do you plan to post a form BESS Tolling Agreement contract to the RFP website so that we can provide comments with our proposal?

    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.

    Will a recording of the May 3, 2023 RFP Informational webinar be made available on the AES website? If yes, when?

    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.

    The Performance and Degradation Table shown in Schedule E.1 indicates that AES prefers overbuilding the energy storage and letting it degrade rather than maintaining capacity with augmentation — is that correct?

    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.

    Does AES explicitly not want augmentation of the energy storage so that BOL power and capacity = EOL power and capacity?

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

    Where is the estimated annual discharge throughput for the energy storage to be measured, at the energy storage DC terminals, at the inverter terminals (high or low) or at the POI?

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

    Schedule E.1 references “maximum run-time per charge” — as you can charge the energy storage as slowly as needed (i.e., at very low power), please elaborate on the question.

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

    In Schedule E.1, do “Standby Losses (%)” include auxiliary loads?


    From Schedule E.1, please define “Expected Equivalent Forced Outage Rate."

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

    Could you please confirm whether grid charging will be allowed for the PV + DC or AC coupled BESS configurations? If grid charging is allowed, kindly clarify if there are any limitations on charging, such as specific percentages or charging times.

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

    For solar plus storage projects, in the Q&A it says AC or DC-coupled is allowed, but if the PPA does not allow grid charging for 60 months, doesn’t that mean that DC-coupled is required for the PPA option? If not, how will AES ensure that the BESS is being charged from solar energy only during the first 60 months for an AC-coupled system?

    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.

    Appendix E (the MIPA for the ATA option) indicates the BESS, by definition, is DC-coupled. This does not correlate with the Q&A answer on the preference for AC vs. DC-coupled BESS. Are solar plus storage projects required to be DC-coupled for the ATA option?

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

    Additional resources

    RFP overview

    Learn about the AES Indiana RFP proposal.

    Project schedule

    RFP milestone dates and deadlines.

    RFP documents

    Learn how to submit an RFP proposal.

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