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Refers to grids or networks that deliver electrical power on a large scale, that is, networks for bulk power transmission. For smaller scale networks, refer to distribution-network or microgrids.

Power grids or power networks typically refer to bulk power generation and transmission resources. The term power grids is more suitable for high-voltage transmission networks and should not be used to describe distribution networks or microgrids.

Power grids typically transmit bulk electrical power from large generation facilities and deliver it to load centers.

The study of power grids may involve their stability properties (rotor-angle stability, small-signal stability), steady-state power transfer capability (sometimes referred to as voltage stability), network expansion, resource adequacy, reliability, operation & control, and the underlying electricity market.