Balancing, or load balancing, is a requirement made of transmission systems that the energy sent or requested from energy producers or other suppliers be equal to the amount of energy delivered to customers.

Balancing energy supply is the quantity of the total reserve energy available to be added into the system over and above any energy scheduled for use at a given time. It is a combination of all reserves ready to be pressed into use whenever an imbalance occurs between system load and customer demand. These reserves can include spinning and non-spinning reserves, replacement reserve, regulation, and any other energy from generators which can respond to a short-notice request for more energy.

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