East Coast 400 Kv Overhead Line Upgrade Environmental Impact
Total Page:16
File Type:pdf, Size:1020Kb
East Coast 400 kV Overhead Line Upgrade Environmental Impact Assessment Report Volume 2 | Main Text January 2021 Scottish Hydro Electric Transmission plc Inveralmond House 200 Dunkeld Road Perth PH1 3AQ Tel: +44 (0)1738 456 000 www.ssen-transmission.co.uk i CONTENTS LIST OF ABBREVIATIONS IV 1 INTRODUCTION 1-1 1.1 Overview of the Proposed Development 1-1 1.2 Background to the Proposed Development 1-1 1.3 Previous Environmental Assessment 1-2 1.4 Legislative Requirements 1-2 1.5 Contents of the Environmental Impact Assessment Report 1-3 1.6 EIA Quality 1-3 1.7 Notifications 1-4 2 CONSIDERATION OF ALTERNATIVES 2-2 2.1 Introduction 2-2 2.2 Development Considerations 2-2 2.3 Alternatives 2-2 2.4 Design evolution 2-4 2.5 Summary 2-4 3 DESCRIPTION OF THE PROPOSED DEVELOPMENT 3-1 3.1 Introduction 3-1 3.2 The Proposed Development 3-1 3.3 Limits of Deviation 3-2 3.4 Construction Programme 3-2 3.5 Construction Environmental Management 3-2 3.6 Construction Practices and Phasing 3-4 3.7 Construction Employment and Hours of Work 3-14 3.8 Construction Traffic 3-15 3.9 Operation and Management of the Transmission Connection 3-15 4 EIA CONSULTATION AND SCOPE 4-1 4.1 Introduction 4-1 4.2 Pre-Application Consultation 4-1 4.3 Scoping 4-1 4.4 Gatecheck 4-2 4.5 Potentially Significant Issues 4-3 4.6 Scoped-out Issues 4-3 5 METHODOLOGY 5-1 5.1 Introduction 5-1 5.2 Identification of Baseline 5-1 5.3 Assessment of Likely Significant Environmental Effects 5-2 5.4 Identification of Mitigation Measures 5-4 5.5 Cumulative Effects 5-4 5.6 Assumptions and Limitations 5-7 6 HYDROLOGY, HYDROGEOLOGY AND SOILS 6-1 6.1 Introduction 6-1 6.2 Assessment Methodology and Significance Criteria 6-1 6.3 Baseline Conditions 6-8 6.4 Issues Scoped Out 6-16 6.5 Assessment of Effects, Mitigation and Residual Effects 6-17 6.6 Summary 6-23 ii 7 BIODIVERSITY 7-1 7.1 Introduction 7-1 7.2 Assessment Methodology and Significance Criteria 7-1 7.3 Baseline Conditions 7-11 7.4 Issues Scoped Out 7-20 7.5 Assessment of Effects, Mitigation and Residual Effects 7-26 7.6 Summary 7-41 8 CULTURAL HERITAGE 8-1 8.1 Introduction 8-1 8.2 Assessment Methodology and Significance Criteria 8-1 8.3 Baseline Conditions 8-8 8.4 Issues Scoped Out 8-12 8.5 Assessment of Effects, Mitigation and Residual Effects 8-12 8.6 Summary 8-25 9 NOISE AND VIBRATION 9-1 9.1 Introduction 9-1 9.2 Assessment Methodology and Assessment Criteria 9-2 9.3 Baseline Conditions 9-12 9.4 Issues Scoped Out 9-12 9.5 Assessment of Effects, Mitigation and Residual Effects 9-13 9.6 Summary 9-23 10 ELECTRIC AND MAGNETIC FIELD EFFECTS 10-24 10.1 Introduction 10-24 10.2 Assessment Methodology 10-24 10.3 Baseline Conditions 10-27 10.4 Issues Scoped Out 10-29 10.5 Assessment of Effects, Mitigation and Residual Effects 10-30 10.6 Summary 10-34 11 CUMULATIVE EFFECTS 11-1 11.1 Introduction 11-1 11.2 In-Combination Effects 11-1 11.3 Effect Interactions 11-1 12 SCHEDULE OF ENVIRONMENTAL MITIGATION 12-2 12.1 Introduction 12-2 OTHER VOLUMES VOLUME 1 – NON-TECHNICAL SUMMARY VOLUME 3 – FIGURES VOLUME 4 – TECHNICAL APPENDICES iii LIST OF ABBREVIATIONS AAAC All Aluminium Alloy Conductor AC Alternating current ACAS Aberdeenshire Council Archaeology Service ACSR Aluminium Conductor Steel Reinforced ASNW Ancient Semi-Natural Woodland ATV All-terrain vehicle AWI Ancient Woodland Inventory BGN Background Noise BGS British Geological Survey BoCC Birds of Conservation Concern BPA Bonneville Power Administration BPP Badger Protection Plan BSI British Standards Institution CAR Controlled Activity Regulation CDM Construction Design and Management CEMP Construction Environmental Management Plan CIEEM Chartered Institute of Ecology and Environmental Management CRA Collision Risk Assessment CSRSG Central Scotland Raptor Study Group CTMP Construction Traffic Management Plan DC Direct current DECC Department of Energy and Climate Change DWPA Drinking Water Protected Areas EcIA Ecological Impact Assessment ECoW Environmental Clerk of Works ECU Energy Consents Unit EHO Environmental Health Officer ELF Extremely low frequency EIA Environmental Impact Assessment EIA Report Environmental Impact Assessment Report EMF Electric and Magnetic Field EPS European Protected Species EPZ Equipotential Zones ESO Electricity System Operator EZoI Ecological Zone of Influence FISA Forestry Industry Safety Accord FLS Forestry and Land Scotland GEMP General Environmental Management Plans GDL Gardens and Designed Landscapes GRR Geotechnical Risk Register GWDTE Groundwater Dependent Terrestrial Ecosystems iv HER Historic Environment Record HES Historic Environment Scotland HEPS Historic Environment Policy for Scotland ICNIRP International Commission on Non-Ionizing Radiation Protection IEF Important Ecological Feature IEMA Institute of Environmental Management & Assessment JNCC Joint Nature Conservation Committee Km Kilometre kV Kilovolt LNCS LOCAL Nature Conservation Sites LNR Local Nature Reserve LOD Limit of Deviation NETS SQSS National Electricity Transmission System Security and Quality of Supply Standards NESBReC North East Scotland Biological Records Centre NERSG North East Scotland Raptor Study Group NNR National Nature Reserve NLS National Library of Scotland NPF3 National Planning Framework 3 (Scotland) NETS SQSS National Electricity Transmission System Security and Quality of Supply Standards NSR Noise Sensitive Receptor NOA Network Options Assessment NRPB National Radiological Protection Board NSR Noise sensitive receptors NTS Non-Technical Summary NVC National Vegetation Classification OHL Overhead Line OPGW Optical Ground Wire PAN Planning Advice Note PAWS Plantation on Ancient Woodland Sites PHE Public Health England PLHRA Peat Landslide Hazard and Risk Assessment PKHT Perth and Kinross Heritage Trust PPG Pollution Prevention Guidance PWS Private Water Supply RSPB Royal Society for the Protection of Birds SAC Special Areas of Conservation SBL Scottish Biodiversity List SBN Scoping Briefing Note SEPA Scottish Environment Protection Agency SHE Scottish Hydro Electric SM Scheduled Monument SNH Scottish Natural Heritage (now NatureScot) SNRHE Scottish National Record of the Historic Environment v SPT Scottish Power Transmission SPP Species Protection Plan SSSI Site of Special Scientific Interest TAN Technical Advice Note T&FRSG Tayside and Fife Raptor Study Group WSI Written Scheme of Investigation vi 1 INTRODUCTION 1.1 Overview of the Proposed Development Scottish Hydro Electric Transmission plc (SHE Transmission) is a wholly-owned subsidiary of the SSE plc group of companies. SHE Transmission (hereafter referred to as ‘the Applicant’) owns and maintains the electricity transmission network across the north of Scotland, and holds a licence under the Electricity Act 1989 (hereafter referred to as the ‘Electricity Act’) to develop and maintain an efficient, co-ordinated and economical system of electricity transmission. Due to the growth in renewable electricity generation in the north and north-east of Scotland, upgrade of the transmission network is required to provide the necessary increase in transmission capacity. The Applicant is applying for consent under Section 37 (s37) of the Electricity Act to upgrade approximately 168 kilometres (km) of an existing 275 kV overhead line (OHL), connecting existing substations at Kintore, Fetteresso, Alyth T-Junction and the Applicant’s licence boundary with Scottish Power Transmission (SPT), as shown on Figure 1.1: Location Plan and Overview, to enable operation at 400 kV (hereafter referred to as the Proposed Development). This would involve replacing the existing conductors and their associated fittings and insulators. Deemed planning permission under Section 57(2) of the Town and Country Planning (Scotland) Act 1997 (the Town and Country Planning Act) is also sought for associated works such as access track upgrades. The Proposed Development is described in full in Chapter 3: Description of the Proposed Development of this document. 1.2 Background to the Proposed Development The requirement for the Proposed Development is necessary to fulfil the statutory and licence obligations on the Applicant as the onshore transmission licence holder in the north of Scotland. These obligations relate to developing the electricity transmission network to provide adequate transmission capacity and to provide connections to customers in the north of Scotland who wish to connect to and use the transmission system to participate in the national wholesale electricity market. As a result of increasing renewable electricity generation such as onshore windfarms, in conjunction with the recent increases in smaller, background generation, the Applicant is progressing a number of transmission reinforcement schemes in the north of Scotland to provide the necessary transmission capacity in accordance with the National Electricity Transmission System Security and Quality of Supply Standards (NETS SQSS). The need for a high voltage electricity transmission network is also included within the current National Planning Framework 3 (NPF3)1 as “new and / or upgraded onshore electricity transmission cabling of or in excess of 132 kilovolts, and supporting pylons”. The NPF3 confirms that the Proposed Development is required to support the delivery of an enhanced high voltage electricity transmission grid which is identified as vital in meeting national targets for electricity generation, statutory climate change targets and the security of energy supply. This reinforcement has also been recommended to ‘Proceed’ by the Electricity System Operator (ESO) through the Network Options Assessment (NOA) in 2017/182, 2018/193 and 2019/204. 1 National Planning Framework 3: monitoring report (2019). Available at: https://www.gov.scot/publications/national-planning-framework-3-monitoring- report/pages/3/ (Accessed: 16/06/2020) 2 National Grid (2018). Network Options Assessment 2017/2018. Available at: https://www.nationalgrideso.com/document/106481/download 3 National Grid (2019). Network Options Assessment 2018/2019. Available at: https://www.nationalgrideso.com/document/137321/download 4 National Grid (2020).