Electric Transmission: Woburn to Mystic

Arlington

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Burying a big new intra-regional transmission line under the streets between Worburn (big station) and near the Mystic/Everett generation-distribution (across from Casino)


MYSTIC TO WOBURN LINE PROJECT
To improve reliability and address growing need for electricity identified by ISO-NE, New England’s power grid manager, Eversource is constructing the Mystic to Woburn Line Project.

 

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WickedLocal reports an update (using same image, above) based on a presentation to the Medford City Council

Salient points:

2020 Goals:
+ Complete installation of 9 vaults (every 2000' along the line) and piping between them.
+ Begin curb-to-curb repaving along the whole route (and what municipality doesn't love free paving?)

2021 Goals:
+ Pull cables,
+ weld them together at the vaults in a single 5-days-solid sprint
+ fill system with dialectric fluid (aka refined mineral oil)
+ finish repaving
 

jbray

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What is the start date here? The construction page on Eversource is 2017 and 2019. Kind of an incredible time to be working on Mystic while all the bridges are out. On one hand, get it all done at once so that disruption eels like it just ends, but on the other, that will be a crazy 5 days.
 

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I havent' seen a reason why they're behind the originally-posted schedule. I think it is likely a mix of the cities wanting the promise to re-pave , giving extra time for community out reach, and probably a little bit of expected "we hit rock"

They're using directional drilling between vaults, so it is more like they occupy 500' of road "upstream" from each vault as they go. It actually has not been that disruptive in the stretches I've seen worked on.

I interpret the "5 days solid" to be a time when they'll have a construction tent atop each of the 9 vaults--nine simultaneous point disruptions but something that can be managed easily with a parking ban and a police detail at each.
 

AmericanFolkLegend

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^ Really? My sense was that they had already done the stuff at the Winchester line with Medford and had not seen evidence of trenching. (They had cut the pavement for sure but it looked more like what you do for launching and landing the drill between vaults)
 

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