NONE 20251229134624856 wseas/wseas content-registration-form+ja@crossref.org content-registration-form WSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS 1109-2734 2224-266X Javier Culqui-Tipan Departamento de Eléctrica Electrónica y Telecomunicaciones, Universidad de las Fuerzas Armadas ESPE, Sangolquí, ECUADOR Diego Ortiz-Villalba Departamento de Eléctrica Electrónica y Telecomunicaciones, Universidad de las Fuerzas Armadas ESPE, Sangolquí, ECUADOR Carlomagno Andrade-Pobea Departamento de Eléctrica Electrónica y Telecomunicaciones, Universidad de las Fuerzas Armadas ESPE, Sangolquí, ECUADOR Roberto Salazar-Achig Facultad de Ciencias de la Ingeniería y Aplicadas, Universidad Técnica de Cotopaxi, Latacunga, ECUADOR High-impact, low-probability (HILP) events, such as natural disasters, have increased the vulnerability of power distribution systems (PDS). PDS resilience refers to their ability to withstand these events and recover quickly. This study proposes a methodological framework and a computational tool to determine the optimal sizing and placement of battery energy storage systems (BESS) and power switches within PDS, thereby enhancing their resilience against lahars triggered by volcanic eruptions. The focus is on reducing energy not supplied (ENS) during PDS recovery. The results indicate that the proposal can improve PDS resilience to exogenous events by investing in BESS and switches, ensuring electrical supply to critical services such as hospitals, shelters, and police under demand-side management. 12 29 2025 12 29 2025 268 28 https://creativecommons.org/licenses/by/4.0/deed.en_US 10.37394/23201.2025.24.28 https://wseas.com/journals/cas/2025/a565101-867.pdf Abiri-Jahromi A, Fotuhi-Firuzabad M, Parvania M, Mosleh M.: Optimized Sectionalizing Switch Placement Strategy in Distribution Systems. 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