How do transformers reduce power losses when electricity is sent over long distances?

Transformers reduce power losses during long-distance transmission by enabling the use of high voltages, which allows for a corresponding decrease in current.12

The power lost in transmission lines due to Joule heating is calculated by the formula $P=I^{2}R$, where $P$ is the power loss, $I$ is the current, and $R$ is the electrical resistance of the conductor. Because the power loss is proportional to the square of the current, even small reductions in current lead to significant decreases in energy wasted as heat.31

Electric generators produce power at relatively low voltages, but transformers are used to "step up" this voltage before the electricity is sent over long distances. By increasing the voltage, the system can transmit the same total amount of power while maintaining a much lower current, thereby minimizing resistive heating losses in the transmission lines. Once the electricity reaches its destination, other transformers are used to "step down" the voltage to safer, usable levels for consumers.421