The transition toward electric public transportation marks a vital step in reducing environmental pollutants and enhancing energy efficiency. However, without robust electricity infrastructure and well-adapted regulatory frameworks, this transition is unlikely to meet its full potential. This study investigates the interrelationship between power grid capacity and electricity sector regulations in supporting the development of electric public transit systems, with a specific focus on developing countries. By analyzing technical and economic aspects—such as time-of-use electricity tariffs, grid connection protocols, and standards for high-capacity charging stations—the paper draws on international experiences from China, Europe, and the United States. Findings highlight that successful electrification relies on three essential pillars: tariff reform, regulatory standardization, and enabling private investment. According to projections by the International Energy Agency, electric vehicle electricity demand could exceed 1,155 TWh by 2040, nearly double Brazil’s current total annual electricity consumption. Without strategic interventions—such as smart charging management and grid upgrades—this demand may overwhelm existing infrastructure. Furthermore, in countries like Iran, the lack of a dedicated electricity tariff for charging stations remains a key obstacle to growth. The paper concludes by proposing a set of actionable policy recommendations aimed at supporting the widespread adoption of electric public transportation and addressing core challenges related to regulation, infrastructure readiness, and investment.