This read-write TruthValue is an action object: setting it resets the Green Ethernet cumulative energy-savings counter, rlPortStatGreenEthCumulativeEnergySaved, back to zero. An admin would trigger this when starting a new measurement period, such as the beginning of a fiscal year, so cumulative savings reporting does not mix old and new data. For example, at the start of a new annual sustainability reporting cycle, the admin sets this object to true to zero out the prior year's accumulated Green Ethernet savings total.