As a result of the strong winds event we’ve had during the last 30 hours HED experienced two events. 

Each of these events affected 100% of our customers. 


At about 0730 PM on 2/25/19 a whole tree failure caused an outage on the high voltage transmission line from Green Mountain Power – which serves several substations in the area – including HED’s Hardwick and Wolcott stations.  The transmission line was sectionalized to isolate the problem and to redirect power flows in about 90 minutes, but unfortunately when Green Mountain Power tried to re-energize they experienced an equipment failure in Marshfield.  This subsequent failure had to be remedied before power to HED could be restored, and took Green Mountain Power several hours to complete.  Power to HED’s substations and to all customers was fully restored at 1007 PM. 

The second event occurred at 1145 AM today.  This event was for a yet unidentified problem on the same high voltage transmission line as the event last night.  The line was again sectionalized to isolate the problem and redirect power flows in about 90 minutes, but unfortunately the cold temperatures resulted in power demand on the system being very high.  These high loads tripped the transmission line off again – this is referred to as a “cold load situation” in the power industry.  As a result of this HED  had to restore power to small portions of the grid at a time.  This is why many customers experienced their power coming back on – but only for a few moments between 0100 PM and 0225 PM.  All power was fully restored to all customers at 0227 PM, and crews are now working on finding/repairing the origin of the still unidentified problem of today on the high voltage transmission line. 

 

 

 


 

 

 

As a result of the strong winds event we’ve had during the last 30 hours HED experienced two events.  Each of these events affected 100% of our customers. 

At about 0730 PM on 2/25/19 a whole tree failure caused an outage on the high voltage transmission line from Green Mountain Power – which serves several substations in the area – including HED’s Hardwick and Wolcott stations.  The transmission line was sectionalized to isolate the problem and to redirect power flows in about 90 minutes, but unfortunately when Green Mountain Power tried to re-energize they experienced an equipment failure in Marshfield.  This subsequent failure had to be remedied before power to HED could be restored, and took Green Mountain Power several hours to complete.  Power to HED’s substations and to all customers was fully restored at 1007 PM. 

The second event occurred at 1145 AM today.  This event was for a yet unidentified problem on the same high voltage transmission line as the event last night.  The line was again sectionalized to isolate the problem and redirect power flows in about 90 minutes, but unfortunately the cold temperatures resulted in power demand on the system being very high.  These high loads tripped the transmission line off again – this is referred to as a “cold load situation” in the power industry.  As a result of this HED  had to restore power to small portions of the grid at a time.  This is why many customers experienced their power coming back on – but only for a few moments between 0100 PM and 0225 PM.  All power was fully restored to all customers at 0227 PM, and crews are now working on finding/repairing the origin of the still unidentified problem of today on the high voltage transmission line.