This read-only boolean reports whether the device on the other end of this link is actively using Energy Efficient Ethernet at the port's current negotiated speed. An administrator checks this to confirm EEE is being mutually negotiated with the connected peer, since EEE power savings require both ends to participate. For example, if the local side has EEE enabled but this OID shows false, the admin knows the remote device or its NIC doesn't support or isn't using EEE, so no power savings are actually occurring on that link.