Last month we shared with you a map of the transmission routes that serve our eight delivery point substations. Four of those substations provide power to additional substations. For example, our Pantego substation provides service to our Sidney, Ponzer and Mattamuskeet substations. In turn, the Mattamuskeet substation serves our Fairfield, Engelhard and Swindell Fork substations. Our Hatteras Village delivery point provides service to our Ocracoke substation.
In September, we began the process of tying into a new Dominion Energy transmission line loop. Dominion invested $43 million in a 44-mile transmission line upgrade that begins at their Everetts substation in Martin County and terminates at their Pantego substation in Beaufort County. Improved transmission infrastructure boosts reliability and provides service redundancy in the event of an outage. Tideland has completed upgrades at our Pantego delivery point substation to benefit from the Dominion project. In October, the Five Points delivery point substation will undergo similar upgrades. Therefore, a 4-hour planned outage is scheduled for the 3,100 Tideland members served by our Washington and Five Points substations. The outage will begin at 12:01 am on the morning of October 10. Additional notices will go out to those members prior to the planned outage.
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