ENERGY CO OF PARANA

On February 21, 2025, Copel GeT exercised its right of first refusal to acquire all shares of Geração Céu Azul S.A. (“Céu Azul”), currently owned by Neoenergia S.A., which holds a 70% stake in the Consórcio Empreendedor Baixo Iguaçu (“CEBI”), responsible for operating the Baixo Iguaçu HPP, for an equity value of R$ 984 million. The acquisition commitment was formalized through adherence to a CCVA that had already been negotiated between Neoenergia and the original potential buyer of this stake.

After exercising the right of first refusal, Copel GeT entered into another CCVA with DK Holding Investments, S.R.O., to sell: (i) the entirety of its equity interest in Céu Azul, and (ii) its 30% minority stake in CEBI, for an equity value of R$ 570 million, so that the buyer will become the indirect owner of 100% of the Baixo Iguaçu HPP. The total transaction amounts to R$ 1,554 million in equity value.

Copel GeT completed the acquisition of Céu Azul from Neoenergia for R$ 1,050 million (adjusted from a June 2024 base), finalizing the first leg of the two‑step transaction.

In October 2025, Copel GeT closed the sale of HPP Baixo Iguaçu to EnergoPró after satisfying all conditions and regulatory approvals, for a total equity value of the transaction of R$ 1,683.3 million. Of this amount, R$ 155.4 million was paid in February 2025, R$ 1,517.9 million was credited on closing, and R$ 10.0 million remains subject to post-closing steps, demonstrating the company’s execution capacity in recycling minority holdings and capturing value.

Also in October 2025, we completed the sale of Copel Serviços’ photovoltaic power plants and its equity interest in Solar Paraná, through the execution of a Share Purchase Agreement with Usina Solar Thopen 89 SPE Ltda, for a total amount of R$ 78.0 million, as of December 31, 2024 values. The divestment was effectively completed in December 2025, following the completion of the applicable closing conditions, at which time Copel and Copel Serviços received R$ 5.3 million and R$ 74.5 million, respectively.

COMPANHIA PARANAENSE DE ENERGIA

COPEL and Subsidiaries

On March 18, 2026, Copel was successful in the Capacity Reserve Auction in the form of Power, referred to as LRCAP 2026. On that date, we were declared the winner for the sale of the Power product, contributing a total of 1,862.8 MW of installed capacity to be contracted for a 15-year term, with fixed gross revenue set at R$ 963.2 million/MW/year for the HPP Foz do Areia and R$ 1,635.4 million/MW/year for HPP Segredo. The start of operations is scheduled for August 2030 for both HPP Foz do Areia and HPP Segredo.

On April 7, 2026, the Board of Directors of the Brazilian Electricity Regulatory Agency (ANEEL) approved, at a public meeting, the opening of Public Consultation No. 005/2026, aimed at receiving contributions for the 2026 Periodic Tariff Review (RTP) of Copel Distribuição. The process is intended to support the definition of tariffs to take effect as of June 24, 2026, applicable to approximately 5.3 million customers served by the distributor in the State of Paraná. The preliminary proposal prepared by Aneel’s technical staff indicates an average tariff effect of 19.2% for captive consumers, with an average tariff effect of 19.6% for High Voltage (AT) and 19.0% for Low Voltage (BT). According to the regulator, the main factors contributing to this outcome were the repositioning of Parcels A and B, increased transmission costs, sectoral charges, and the removal of financial components associated with the previous tariff process. During the meeting, ANEEL noted that Copel Distribuição submitted a request for the deferral of approximately R$ 1.1 billion, which helped mitigate the initially estimated tariff impact, reducing the preliminary average effect that, absent such deferral, could have exceeded 26.0%. The Public Consultation will remain open for the submission of contributions from April 8 th through May 22, 2026, covering matters related to tariff review, tariff structure, and technical losses. In addition, the holding of Public Hearing No. 002/2026 was approved, scheduled for April 29, 2026, in Curitiba, Paraná, with the aim of broadening the participation of society and sector stakeholders in the regulatory debate.

Provisional Measure No. 1,300/2025, subsequently converted into Law No. 15,235/2025, established a mechanism for the potential renegotiation of outstanding installments related to the Use of Public Assets (Uso do Bem Público – UBP) associated with hydroelectric concessions originally awarded under the highest UBP payment criterion. The mechanism was intended to address certain economic distortions affecting concessions granted in the late 1990s and early 2000s, pursuant to Law No. 9,648/1998. In the context of the regulation of Law No. 15,235/2025 and based on preliminary calculations carried out by the Brazilian Electricity Regulatory Agency (ANEEL), an amount of UBP potentially eligible for renegotiation in respect of Elejor was identified. The renegotiated amount is currently estimated at approximately R$ 420.6 million; however, its final amount, timing and settlement terms remain subject to the execution of an amendment to the relevant concession agreement with the Granting Authority and to the fulfillment of applicable regulatory requirements. The estimated amount reflects the application of a discount mechanism to the present value of the outstanding UBP installments originally due. Elejor may elect, at its discretion, to adhere to the renegotiation mechanism within the deadline currently established for May 1 st, 2026. There can be no assurance that such renegotiation will be completed on the terms currently estimated, or at all, or that it will result in the expected financial or regulatory outcomes.