November 10, 2026

Notice of Intent to Issue a Request for Proposals

2026 Entergy Texas, Inc. Battery Energy Storage System RFP

Entergy Services, LLC ("ESL") hereby provides notice to interested parties that it intends to issue a Request for Proposals for Battery Energy Storage System Resources (the "RFP") on behalf of Entergy Texas, Inc. ("ETI"). ESL expects to issue the RFP in mid-December and plans to conduct a Bidders Conference following issuance of the RFP. Information regarding the RFP and the Bidders Conference will be posted to ESL’s website for the RFP, https://rfp.entergy.com/ENTRFP/SEND/2026etibessrfp/index.htm. Interested participants should monitor the RFP website for information about the Bidders Conference (including the date and time), as well as other information related to the RFP. Proposals responsive to the RFP may be due as early as March 2027.

ETI forecasts an ongoing long-term need for capacity and operational flexibility within the Midcontinent Independent System Operator, Inc. ("MISO") Texas region. ETI plans to initiate the RFP as part of a competitive process to identify viable battery energy storage resources capable of supporting ETI's reliability and capacity needs beginning in 2031 or sooner.

The RFP is expected to seek up to 200 MW of battery energy storage capacity from eligible existing and developmental standalone Battery Energy Storage System ("BESS") resources located within MISO Local Resource Zone 9 ("LRZ 9"). Eligible projects must have a minimum capacity of 50 MW and a maximum capacity of 200 MW. ETI reserves the right to acquire more or less capacity than the target amounts set forth in this notice.

Resources proposed for the RFP would be required to be physically located within the geographic region defined as local resource zone 9 (“LRZ 9”) of Midcontinent Independent System Operator, Inc. (“MISO”) South, with a preference for development resources to be located in the MISO Texas Region.

The RFP will contain criteria to ensure that, at the time of proposal submission, any proposed developmental resource is in a stage of development appropriate for evaluation in the RFP.

Under the RFP, the solicited capacity and related products will be procured through (i) build-own-transfer acquisition agreements (“BOTs”) (exclusively for developmental resources), asset acquisition agreements (“Acquisitions”) (exclusively for existing resources), and electric storage agreements (“ESAs”), all as offered by third party bidders, or (ii) a self-build alternative. The delivery term for an ESA arising out of the RFP will be a minimum of ten (10) years and a maximum of twenty (20) years.

The RFP will target resources having a guaranteed commercial operation/in service date (BOTs), a guaranteed closing date (Acquisition), or a guaranteed delivery term start date (ESAs), between May 31, 2030, and May 31, 2031. ETI will not enter into an ESA or any related agreement pursuant to the RFP that will or may result in the recognition of a long-term liability on the books of ETI (or any of its affiliates), whether the long-term liability is due to lease accounting, the accounting for a variable interest entity (“VIE”) or derivatives, or any other applicable accounting standard.

The storage facilities sought by the RFP will be required to be powered by commercially proven lithium-ion technology. In addition, any facility offered into the RFP will be expected to have a quantity of MISO energy resource interconnection service (“ERIS”) and a quantity of MISO network resource interconnection service (“NRIS”) equal in each case to at least the nameplate capacity of the facility.

Bidders in the RFP will be required to submit proposals for eligible resources that have a fully executed generator interconnection agreement (“GIA”) with MISO, are active in MISO's 2026 planning cycle or an earlier MISO interconnection queue. Resources participating in the MISO Expedited Resource Addition Study ("ERAS") process may also be eligible for participation. Resources lacking an executed GIA or qualifying active interconnection queue or ERAS position will not be eligible to participate in the RFP.

As part of the RFP, ESL may evaluate one or more self-build option(s). The self- build option(s) will be considered and evaluated as an alternative to proposals submitted into the RFP. Competitive affiliates of ETI will not be permitted to participate in the RFP.

The registration process contemplates that Bidders will be required to register each ESA, BOT, or Acquisition proposal with ETI and to pay for each proposal in advance of the RFP’s proposal submission period, a proposal submission fee of $10,000. Any alternative proposal submitted into the RFP (e.g., a proposal containing alternative pricing or an alternative transaction structure) will be required to be registered as a separate proposal.

All dates and time periods referenced in this notice are subject to change. This notice is intended in part to give prospective bidders interested in participating in the RFP advance notice of the RFP. While ETI expects to issue the RFP, by publishing this notice ETI is not assuming, and expressly disclaims, any obligation or commitment to issue the RFP or any other obligation or liability of any kind of ETI that could result from or arise out of this notice.

ESL has engaged Mr. Colin Judd of Accion Group, LLC. to serve as the Independent Monitor (“IM”) for the RFP. Questions about this notice or the RFP should be directed to the administrator of the RFP, Ms. Chandler Finnell at etirfp@entergy.com or to Mr. Judd, at im_etibess@acciongroup.com.