All key stakeholders, such as the local planning authorities and environmental bodies (such as Natural England) have been fully informed of our planned works.

To understand more about the local environment, and to inform the environmental impact assessment, we need to carry out surveys. These will be on land within the corridor, on some adjoining land, and areas that have been identified through consultation feedback as potentially sensitive.

These surveys are to assess the landscape, ecology and cultural heritage aspects of the area, to inform further detailed environmental assessments. All survey information gathered will be published either as part of our preliminary environmental information report at our next stage of consultation or to support our application for a development consent order.

If you have any questions, please get in touch with us via the relevant details below.

Ongoing surveys

Below is a list of our ongoing and upcoming surveys. If for any reason a survey cannot take place on the scheduled date, such as poor weather conditions, we will endeavour to reschedule the survey in a timely manner.

Access to land plots are agreed before any surveys may take place. If you are a landowner and have questions about the surveys on your land, please visit the landowners page for more information.

September 2023 - January 2024MarineTarget areas along the proposed marine route.This survey is undertaken to identify the physical features of the seabed. Please see the Notice to Mariners for further information on the locations -
October 2023 - March 2024Wintering bird surveysKent – Cliffsend, Ebbsfleet, and PRoWs.
Suffolk - Aldeburgh, Knodishall, Sternfield and connecting Public Rights of Way (PRoW).
During a wintering bird survey, undertaken between October and March inclusive, two surveyors will look for any wintering birds; all calls and behaviour will be recorded. These will include foreshore and field counts.


Previously undertaken surveys


January 2024 – February 2024

Traffic surveys

Suffolk – Aldeburgh, Snape, Leiston and Saxmundham

To collect traffic, traffic volume and speed data to support transport planning and design.

November - December 2023Aquatic ecologyKent - Ebbsfleet and Minster.
Suffolk - Aldeburgh, Friston and Sternfield.
During aquatic ecology surveys, the surveyor will enter the watercourse and kick sample for three minutes using a pond net followed by an additional one-minute active search. Should the watercourse be deemed unsafe to enter, the surveyor will conduct a sweep sample from the bank for three minutes.
November - December 2023Bat roost surveysAlong the proposed siting route.To identify and collect physical evidence of bat activity. If no evidence is found, then the ecologist will make an assessment based on any roosting features that present high potential.
November - December 2023Vantage point bird surveysKent - Ebbsfleet and Minster.
Suffolk - Aldeburgh and PRoWs.
To assess bird flight activity and distribution over the survey area.
November - December 2023Dormouse surveysSuffolk - Aldeburgh, Knodishall, Friston, Sternfield and Saxmundham.Checking the tubes for Dormouse activity / evidence.
November - December 2023Bat roost potentialSuffolk - Friston, Knodishall and Sternfield.To identify and collect physical evidence of bat activity. If no evidence is found, then the ecologist will make an assessment based on any roosting features that present high potential.
November 2023Tree surveysKent - Ebbsfleet and Minster.
Suffolk - Aldeburgh, Knodishall, Friston, Sternfield and Saxmundham.
Surveyors will undertake a non-intrusive walkover tree survey recording the location and dimensional data of all trees within and adjacent to the study area. The survey will record the tree species, dimensions, condition and quality.
October - November 2023Dormouse surveysKent - Cliffsend and Minster.
Suffolk - Saxmundham.
Dormouse tubes are set up within hedgerows and left for a period of time to record any evidence of dormouse activity. 
October 2023Bat activity surveysKent - Cliffsend and Ebbsfleet.
Suffolk - Aldeburgh.
Night work - surveyors record the activity of bats. Sunset until 2 hours post sunset. 
September - December 2023Geophysical surveysAcross the proposed route corridor in both Suffolk and Kent.Surveyors use non-intrusive methods to assess any potential features beneath the subsoil, such as buried archaeological remains.
September - October 2023Bat monitoring surveysKent - Cliffsend.Surveyors walk transects around the site and record bat activity. SM4 bat detectors are installed at specific fixed locations within a site and record all bat activity over a series of nights. 
September - October 2023Ground investigations (boreholes and trial pits)Across the proposed route corridor in both Suffolk and Kent.The purpose of the work is to gather data on ground conditions within the project area, informing the design options of different elements of the project.

Boreholes will either be investigative (sample gathering only) or monitoring (left in situ temporarily).

Cone Penetration Tests push instrumented cones on rods into the ground at a continuous rate to a depth of approx. 10 m below ground level.

Trial pits will be excavated by an excavator, taking relevant samples and at selected locations monitoring rates of groundwater infiltration. All trial pits will be subject to archaeological monitoring.

All works are to be undertaken initially via Permitted Development Rights and in agreement with the Land owners, by an experienced and competent ground investigation contractor and, following completion of the works, land will be restored in accordance with Environment Agency good practice guidance.
September 2023Intertidal environmental surveySuffolk - Aldeburgh.The purpose of this survey is to record the characteristics of what is found on the bottom of the intertidal seabed between the Mean High Water Springs (MHWS) and Mean Low Water (MLW) strandlines.
August - September 2023 Engineering landfall surveysKent - Pegwell Bay and West of St Augustine’s and Stoneless golf courses.
Suffolk - Aldeburgh.
This survey is undertaken to understand the physical features of the area and their structure.  Various survey techniques are used to achieve this including the use of a drone that gathers data about the natural and man-made features of the land, as well as its terrain.
August - September 2023Hobby surveysSuffolk - PRoW.Consists of four visits, typically between April to September. The initial visit is to check for any occupancy of Hobbies. The second visit is to check for any active Hobby nests. The third visit is to again check for any more active nests but also for any young. The final check is to check for any fledged young. 
June - July 2023Engineering landfall surveysKent - Pegwell Bay.See above.
June 2023Noise monitoringKent - Ebbsfleet.
Suffolk - Saxmundham and Sternfield.
Two surveyors will employ sound monitors, taking account of constraints within the survey area (e.g. reflective surfaces, security, access, local noise sources). The monitors will be left in place for seven days.

Discussion with land owners may be required. 
June 2023Nightjar surveysSuffolk - PRoW.Transects follow the length of all hedgerows, fence-lines and field margins, with deviations where possible. Surveys are conducted at dusk as nightjars are most active, surveyors will walk the route listening for nightjar sounds.
June 2023Intertidal environmental surveyKent - Pegwell Bay.See above.
April and June 2023Ecology phase 1 walkoverKent - Cliffsend, Ebbsfleet, Minster, and Pegwell Bay.
Suffolk - Aldeburgh.
Undertaken by two surveyors, the survey areas the vegetation, and any species are mapped onto Ordnance Survey maps. A desk study using aerial photography was used prior to the walkover.
March - July 2023Common bird censusKent - Ebbsfleet, Cliffsend Cottington Hill, Lower Gladstone and Minster Marshes. 
Suffolk - Aldeburgh, Saxmundham, Thorpeness, and PRoW.
The survey follows hedgerows, fence-lines and field margins to record any species that may be passing through the survey area. Survey routes are mapped, and the direction walked alternated on each visit, to ensure that all areas are covered at various times of day.

Surveys are undertaken early in the morning, during this time, breeding birds are more active and can be detected in song more frequently. These surveys are conducted between March and July.
February - June 2023Vantage point surveysKent - PRoW.The purpose of vantage point surveys is to record flight lines of species which are potentially sensitive to collision with infrastructure to assess collision risk. Birds on the ground within the survey area will also be recorded.
January - March & May 2023Landscape viewpoint surveysKent - Minster Marshes and PRoW.
Suffolk - Aldeburgh, Friston, Knoddishall, Leiston, Saxmundham, and PRoW.
Landscape viewpoint surveys are required to support the landscape (mitigation) design and the design of the layout of the proposed converter station and substation infrastructure. 

The site surveyors will visit locations surrounding the converter station and substation sites, cable routes and landfall, to review potential locations for publicly accessible photography.

Kent only - The surveys will also allow us to review the overhead line connection over the River Stour and inform the design of the proposed overhead line towers.
October 2022 – March 2023Wintering bird surveysKent – Cliffsend, Ebbsfleet, and PRoW.During a wintering bird survey, undertaken between October and March inclusive, two surveyors will look for any wintering birds; all calls and behaviour will be recorded. These will include foreshore and field counts.
September 2022Hobby surveysRSPB Area.See above.
July - August 2022Arboricultural walkoversKent – Ebbsfleet.
Suffolk Aldeburgh, Aldringham, Hazelwood, and Sizewell.
Usually undertaken by two surveyors. These surveys are non-intrusive and consist of noting scientific name, measurements, age, branch spread, physiological and structural conditions, management conditions and whether there is a Tree Preservation Order or a Conservation Area Protection.
June 2022Breeding bird surveySuffolk – PRoW.See above.
April – May and December 2022Ecology phase 1 walkoverSuffolk - Aldeburgh, Aldringham, Hazelwood, Knoddishall, Leiston, and Sizewell.See above.