Which of the following is NOT one of the four main elements of the electrical system?

The correct answer is the option that refers to "Storage." In the context of the electrical system, the four main elements typically include Generation, Transmission, Distribution, and Consumption (sometimes referred to as Load). Generation involves the creation of electricity from various sources such as fossil fuels, nuclear, solar, and wind. Transmission refers to the high-voltage transfer of electric power from generating plants to substations. Distribution encompasses the delivery of electricity from substations to end users through local power lines.

While storage, such as batteries and pumped hydro storage, plays a significant and growing role in modern electrical systems — particularly in terms of managing energy supply and demand — it is not traditionally included as one of the main foundational elements of the electrical grid. Instead, storage is often considered an ancillary aspect that supports the main elements by improving reliability and efficiency, rather than being one of the primary structures of the electrical system itself.