Electric power transmission and distribution networks play a key role in the transportation of electrical energy from power plants to end consumers. Over decades, electric power networks have evolved to accommodate growing electrical energy demands and changes in production and distribution methods. In the current period, the integration of renewable energy sources at all voltage levels is highly popular, driven by a pronounced trend towards achieving ecological sustainability and energy independence. The significant integration of renewable energy sources results in the need for greater transmission capacities, necessitating the construction of new transmission and distribution corridors or the reinforcement of existing ones. The replacement of conductors on existing overhead lines with high-temperature low-sag (HTLS) conductors enhances their transmission capabilities and defers the need for the construction of new parallel connections. Additionally, the revitalization of existing overhead lines with HTLS conductors presents a relatively straightforward and financially viable solution for alleviating network congestion. The paper describes the structure of transmission and distribution networks, with a specific focus on overhead line construction to provide a better understanding of the structure, as HTLS conductors utilize the same. Furthermore, the types of HTLS conductors are discussed, and the reasons for the reconstruction of electric power networks using HTLS conductors are provided. Finally, the paper concludes with an overview of commercial solutions of HTLS conductors available in the market.