• building approximately 18 km of new 400 kV overhead line
• building approximately 11 km of new 400 kV underground cable
• removing around 27 km of existing 132 kV and 400kV overhead line between Burstall Bridge and Twinstead Tee
• additional works to support construction, including temporary construction compounds, site offices, haul roads and new road junctions (bellmouths)
• works to deliver a minimum of 10% biodiversity net gain, including planting and other environmental enhancements.

We are also building a new substation at Twinstead Green (between Butler's Wood and Walegrave Wood). The substation is where National Grid's high voltage transmission network connects into the low voltage network run by UK Power Networks, who is the distribution network operator in this area. We applied to build the GSP substation through a separate planning application to Braintree District Council, as this will reduce the overall amount of time it will take to build the project.

You can view the detailed plans included in our application for development consent by visiting the Planning Inspectorate's website here.

Current and upcoming works

Across the first half of this year, we've focused on building construction accesses and a temporary haul road so that we can reduce the need for construction traffic to use existing roads. We’ll continue to work on these over the next few months. To do this, we’ve had to carry out vegetation management (such as trimming, pruning, coppicing or removal) at various locations. The next phase of these works is planned from mid-September until the end of October. You can read more about why we need to carry out these works here.

In the autumn, we’ll take delivery of some of the cabling that will form part of the new transmission line. We will then begin underground cable works at various locations, and construction of the new overhead line will start to ramp up.

Traffic management 

When we carry out works near to or on the public highway, we often need to use traffic management (such as temporary traffic lights or road closures) to help keep you and our construction workforce safe. 

To make it easier to see the works planned for your area, we have split the route of the project into four sections. In each section, a table shows the current and upcoming works for the area. These dates are subject to change, and we update these tables regularly as new works are planned.