UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

August 19, 2026

Commission File Number: 001-40752

RENEW ENERGY GLOBAL PLC

(Translation of registrant’s name into English)

C/O Vistra (UK) Ltd, Suite 3, 7th Floor

50, Broadway, London, England, SW1H 0DB, United Kingdom

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

Other events

Upcoming Expiration of ReNew Energy Global plc Warrants (Nasdaq: RNWWW)

Gurugram, India; August 19, 2026: ReNew Energy Global plc ("ReNew" or the "Company") announces that its warrants (Nasdaq: RNWWW) are scheduled to expire at 5:00 p.m., New York City time, on August 22, 2026, pursuant to the terms of the Warrant Agreement dated August 23, 2021. The Company does not intend to extend the term of the warrants.

No Broker Protect Period (Guarantee of Delivery Period) has been established in connection with the expiration of the warrants. Accordingly, trading in RNWWW will be suspended as of the close of business on August 21, 2026, being the trading day immediately preceding the expiration date, and thereafter the warrants will be delisted from Nasdaq.

Any warrants that are not exercised prior to the expiration time will expire in accordance with their terms and will cease to have any further rights or value.

Forward-Looking Statements

This release includes “forward-looking statements” within the meaning of the “safe harbor” provisions of the United States Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by the use of words such as “estimate,” “objective,” “plan,” “project,” “forecast,” “intend,” “will,” “expect,” “anticipate,” “believe,” “seek,” “target,” “milestone,” “designed to,” “proposed” or other similar expressions that predict or imply future events, trends, terms and/or conditions or that are not statements of historical matters. Such forward-looking statements are based on current expectations and projections about future events and various assumptions. The Company cautions readers of this release that these forward-looking statements are subject to risks and uncertainties, most of which are difficult to predict and many of which are beyond the Company’s control, that could cause the actual results to differ materially from the expected results.

The Company’s most recent Annual Report on Form 20-F filed with the United States Securities and Exchange Commission (the “SEC”) on July 30, 2026 or Form 6-Ks furnished to the SEC by the Company outline certain of these risks and uncertainties which may cause actual results to differ. Forward-looking statements should be construed in light of such risk factors and undue reliance should not be placed on forward-looking statements. These forward-looking statements speak only as of the date of this release. The Company expressly disclaims any obligation or undertaking (except as required by applicable law) to release publicly any updates or revisions to any forward-looking statement contained herein to reflect any change in the Company’s expectations with regard thereto or any change in events, conditions or circumstances on which any such statement is based.

About ReNew

Unless the context otherwise requires, all references in this press release to “we,” “us,” or “our” refers to ReNew and its subsidiaries.

ReNew is a leading decarbonization solutions company listed on Nasdaq (Nasdaq: RNW, RNWWW). ReNew’s clean energy portfolio of ~20.5 GW (including 1.7 GW/6.2 GWh of BESS) on a gross basis as of July 31, 2026, is one of the largest globally. In addition to being a major independent power producer in India, we provide end-to-end solutions in a just and inclusive manner in the areas of clean energy, value-added energy offerings through digitalization, storage, and carbon markets that are increasingly integral to addressing climate change. In addition, ReNew has 6.4 GW of solar module and 2.5 GW of solar cell manufacturing capacities and is expanding its solar cells manufacturing capacity by another 4 GW, which is expected to be operational by December 2026. For more information, visit www.renew.com and follow us on LinkedIn, Facebook, X and Instagram.

Press Enquiries

pr@renew.com

Investor Enquiries

Anunay Shahi

Nitin Vaid

ir@renew.com

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.