Step 4B Development Options and Evaluation Report North Connacht 110 Kv Project March 2021
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Step 4B Development Options and Evaluation Report North Connacht 110 kV Project March 2021 Mott MacDonald 5 Eastgate Avenue Eastgate Little Island Co Cork T45 EE72 Ireland T +353 (0)21 480 9800 mottmac.com EirGrid plc, The Oval, 160 Shelbourne Road, Step 4B Development Options Ballsbridge, Dublin, and Evaluation Report D04 E7K5. North Connacht 110 kV Project March 2021 Directors: J T Murphy BE HDipMM CEng FIEI FConsEI FIAE (Managing), D Herlihy BE MSc CEng, R Jefferson BSC MSCS MRICS MCIArb DipConLaw, J Shinkwin BE DipMechEng CEng MIEI, M D Haigh BSc CEng FICE MCIWEM (British) Innealtoirí Comhairleach (Consulting Engineers) Company Secretary: Michael Cremin CPA Registered in Ireland no. 53280. Mott MacDonald Ireland Limited is a member of the Mott MacDonald Group Mott MacDonald | Step 4B Development Options and Evaluation Report North Connacht 110 kV Project Issue and Revision Record Revision Date Originator Checker Approver Description A 1 Feb Caroline Lew Donna Tom Keane Draft for Comment 2021 Paul Foley Hassett B 23 Feb Caroline Lew Donna Tom Keane Draft for Comment 2021 Hassett C 05 March Caroline Lew Donna Tom Keane Final Draft 2021 / Paul Foley Hassett D 15 March Paul Foley Caroline Lew Tom Keane Final Issue 2021 Document reference: 229100591 | 402 | D Information class: Standard This document is issued for the party which commissioned it and for specific purposes connected with the above- captioned project only. It should not be relied upon by any other party or used for any other purpose. We accept no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties. This document contains confidential information and proprietary intellectual property. It should not be shown to other parties without consent from us and from the party which commissioned it. 229100591 | 402 | D | | March 2021 Mott MacDonald | Step 4B Development Options and Evaluation Report North Connacht 110 kV Project Contents Executive summary 1 1 Introduction 5 1.1 The Project 5 1.2 Purpose of this Report 5 1.3 Structure of this Report 6 2 Step 4A Areas of Opportunity 7 2.1 Background to the identification of Step 4A Areas of Opportunity 7 2.1.1 Overhead Line Corridor Options 7 2.1.2 Underground Cable Corridor Options 8 2.2 Step 4A Consultation 9 2.3 Step 4A Consultation Feedback 10 3 Approach to Step 4B 11 3.1 Methodology 11 3.2 Information Gathering 11 3.2.1 Site Walkovers and Surveys 12 3.3 Data and Mapping 13 3.4 Evaluation of Identified OHL and UGC Options 13 4 Criteria for Identifying the Emerging Best Performing Option 14 4.1 Introduction 14 4.2 Technical 14 4.3 Economic 14 4.4 Environmental Performance 14 4.5 Social Performance 15 4.6 Deliverability 16 4.7 Evaluation 16 5 Evaluation Criteria Considerations and Context 17 5.1 Introduction 17 5.2 Technical Context 17 5.2.1 System Reliability 17 5.2.2 Expansion / Extendibility: 17 5.2.3 Repeatability: 18 5.2.4 Technical Operational Risk: 18 5.3 Economic Context 18 5.4 Environmental Context 19 229100591 | 402 | D | | March 2021 Mott MacDonald | Step 4B Development Options and Evaluation Report North Connacht 110 kV Project 5.4.1 Biodiversity 19 5.4.2 Surface Water 20 5.4.3 Ground Conditions (Soils, Geology and Hydrogeology) 20 5.4.4 Material Assets 20 5.4.5 Land Cover 21 5.4.6 Landscape and Visual 21 5.4.7 Archaeology, Architecture and Cultural Heritage 21 5.4.8 Noise 21 5.5 Social Performance 22 5.5.1 Settlements 22 5.5.2 Nuisance (Traffic Disruption and Noise) 22 5.5.3 Land Use 23 5.5.4 Community Benefits 23 5.6 Deliverability Context 23 5.6.1 Implementation Timelines 24 5.6.2 Project plan flexibility 24 5.6.3 Dependence on other projects 24 5.6.4 Permits and Wayleaves 24 5.6.5 Design Complexity 25 6 Evaluation of Overhead Line Corridor Options 26 6.1 Introduction 26 6.2 OHL Corridor Option A (purple on map) 26 6.2.1 Description of OHL Corridor Option A 26 6.2.2 Technical Performance - Option A 26 6.2.3 Economic Performance - Option A 27 6.2.4 Environmental Performance – Option A 27 6.2.5 Social Performance – Option A 31 6.2.6 Deliverability Performance - Option A 34 6.2.7 Summary Option A 35 6.3 OHL Corridor Option B (orange on map) 35 6.3.1 Description of OHL Corridor Option B 35 6.3.2 Technical Performance - Option B 35 6.3.3 Economic Performance - Option B 36 6.3.4 Environmental Performance - Option B 36 6.3.5 Social Performance – Option B 40 6.3.6 Deliverability Performance - Option B 42 6.3.7 Summary Option B 43 6.4 OHL Corridor Option C (pink on map) 43 6.4.1 Description of OHL Corridor Option C 43 6.4.2 Technical Performance - Option C 44 6.4.3 Economic Performance - Option C 44 6.4.4 Environmental Performance – Option C 45 6.4.5 Social Performance – Option C 48 229100591 | 402 | D | | March 2021 Mott MacDonald | Step 4B Development Options and Evaluation Report North Connacht 110 kV Project 6.4.6 Deliverability Performance - Option C 51 6.4.7 Summary Option C 51 6.5 OHL Corridor Option D (blue on map) 52 6.5.1 Description of OHL Corridor Option D 52 6.5.2 Technical Performance - Option D 52 6.5.3 Economic Performance - Option D 52 6.5.4 Environmental Performance – Option D 53 6.5.5 Social Performance Option D 56 6.5.6 Deliverability Performance - Option D 58 6.5.7 Summary Option D 59 6.6 Evaluation Matrix (Overhead Line) 60 7 Evaluation of Underground Cable Corridor Options 61 7.1 Introduction 61 7.2 UGC Corridor Option 1 (orange on map) 61 7.2.1 Description of UGC Corridor Option 1 61 7.2.2 Technical Performance - Option 1 61 7.2.3 Economic Performance - Option 1 62 7.2.4 Environmental Performance – Option 1 62 7.2.5 Social Performance 66 7.2.6 Deliverability Performance - Option 1 69 7.2.7 Summary Option 1 71 7.3 UGC Corridor Option 2 (blue on map) 71 7.3.1 Description of UGC Corridor Option 2 71 7.3.2 Technical Performance - Option 2 71 7.3.3 Economic Performance - Option 2 72 7.3.4 Environmental Performance – Option 2 72 7.3.5 Social Performance 76 7.3.6 Deliverability Performance - Option 2 79 7.3.7 Summary Option 2 81 7.4 UGC Corridor Option 3 (purple on map) 81 7.4.1 Description of UGC Corridor Option 3 81 7.4.2 Technical Performance - Option 3 81 7.4.3 Economic Performance - Option 3 82 7.4.4 Environmental Performance – Option 3 82 7.4.5 Social Performance 86 7.4.6 Deliverability Performance - Option 3 89 7.4.7 Summary Option 3 90 7.5 Evaluation Matrix (Underground Cable) 91 8 Emerging Best Performing Option 92 8.1 Introduction 92 8.2 Emerging Best Performing Overhead Line 92 8.3 Emerging Best Performing Underground Cable 92 229100591 | 402 | D | | March 2021 Mott MacDonald | Step 4B Development Options and Evaluation Report North Connacht 110 kV Project 8.4 Emerging Best Performing Option 93 8.5 Next Steps 93 Appendices 95 A. Mapping 96 B. Social Impact Tables 97 B.1 Settlement Hierarchy 97 B.2 GeoDirectory Address Data 98 B.3 Demographic Profile/Population Statistics 98 B.4 Social Receptors / Stakeholders: 6 C. Step 4A Constraints Mapping 27 D. Enhanced Matrix for OHL and UGC Corridor Options 29 E. Emerging Best Performing Option Corridor Mapping 32 Tables Table 5.1: Asset Reliability Statistics 2011 - 2016 17 Table 5.2: Transmission Standard Development Costs 19 Table 5.3: Transmission Standard Development Costs - Shunt Reactor 19 Table 5.4: Bands for Economic Assessment 19 Table 6.1: Summary of Technical Performance - Option A 27 Table 6.2: Costs - Option A 27 Table 6.3: Summary of Economic Assessment - Option A 27 Table 6.4: Summary of Environmental Performance – OHL Corridor Option A 30 Table 6.5: Summary of Social Performance – OHL Corridor Option A 34 Table 6.6: Summary of Deliverability Performance - Option A 35 Table 6.7: Summary of Option A 35 Table 6.8: Summary of Technical Performance - Option B 36 Table 6.9: Costs - Option B 36 Table 6.10: Summary of Economic Assessment - Option B 36 Table 6.11: Summary of Environmental Performance – OHL Corridor Option B 39 Table 6.12: Summary of Social Performance – OHL Corridor Option B 42 Table 6.13: Summary of Deliverability Performance - Option B 43 Table 6.14: Summary of Option B 43 Table 6.15: Summary of Technical Performance - Option C 44 Table 6.16: Costs - Option C 44 Table 6.17: Summary of Economic Assessment - Option C 45 229100591 | 402 | D | | March 2021 Mott MacDonald | Step 4B Development Options and Evaluation Report North Connacht 110 kV Project Table 6.18: Summary of Environmental Performance – OHL Corridor Option C 48 Table 6.19: Summary of Social Performance – OHL Corridor Option C 50 Table 6.20: Summary of Deliverability Performance - Option C 51 Table 6.21: Summary of Option C 51 Table 6.22: Summary of Technical Performance - Option D 52 Table 6.23: Costs - Option D 53 Table 6.24: Summary of Economic Assessment - Option D 53 Table 6.25: Summary of Environmental Performance – OHL Corridor Option D 56 Table 6.26: Summary of Social Performance – OHL Corridor Option D 58 Table 6.27: Summary of Deliverability Performance - Option D 59 Table 6.28: Summary of Option D 59 Table 6.29: Multicriteria Assessment 60 Table 7.1: Summary of Technical Performance - Option 1 62 Table 7.2: Costs - Option 1 62 Table 7.3: Summary of Economic Assessment - Option 1 62 Table 7.4: Summary of Environmental Performance – UGC Option 1 66 Table 7.5: Summary of Social Performance – UGC Corridor Option 1 69 Table 7.6: Summary of Deliverability Performance - Option 1 71 Table 7.7: Summary of Option 1 71 Table 7.8: Summary of Technical Performance - Option