First Quarter 2022 Earnings Report

Main business breakdown Networks business EBITDA performance Distribution & Transmission Tariff Review Tariffs decree Transmission expected on H2 2022 2020-23 Period review 7% Returns (real terms post tax) Distribution 2020-24 Period review Process still ongoing 6% Returns (real terms post tax) 123 Data only for Enel Distribution concession area; Includes transmission tolls INTERNAL Main period KPIs Q1 2021 Q1 2022 Energy distributed (TWh)1 +5% 3.9 4.1 -13% SAIDI² - Dx 155 134 (min.) enel EBITDA (USD mn) +71% 56 13 Losses +0.3 pp 33 5.0 5.3 19 Networks³ (%) +10% 19 Telecontrols 2.4 2.7 (#'000) 24 14 +24% e-Billings ('000#) 362 449 Q1 2021 Q1 2022 SAIDI Average LTM (Last Twelve Months) only includes the distribution business. Transmission business SAIDI in Q1 2022: 6 min and Q1 2021: 9 min Average LTM (Last Twelve Months) for both distribution and transmission businesses Distribution Transmission Transmission tariff adjustment 13

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