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Supporting information and factsheets

The Holford Rules 
Guidelines we follow for the routeing of new high voltage overhead transmission lines.

The Horlock Rules 
Guidelines we follow for the siting of new substations. 

National Grid’s commitments when undertaking works in the UK   
Our stakeholder, community and amenity policy, which sets out our ten commitments when undertaking electricity and gas work in the UK.

Our approach to the design and routeing of electricity transmission lines 
This document sets out the process that we use to take projects forward: the stages of consultation; the people and organisations that we consult with, and the way in which we appraise and narrow down the options. 

Our approach to options appraisal 
This document provides more detail on the various assessments we undertake at different stages of the project. 

Undergrounding high voltage electricity transmission lines - the technical issues 
Information on the technical issues associated with undergrounding high voltage transmission lines. 

Electricity transmission cost study - National Grid’s view 
How the Institution of Engineering and Technology and Parsons Brinckerhoff’s report (Jan 2012) on the costs of new electricity transmission infrastructure compares with National Grid’s view.

Electric and Magnetic Fields (EMFs) - The facts 
Produced by the Energy Networks Association, this guide explains the research undertaken with regard to electric and magnetic fields (EMFs) and health and discusses the conclusions of that research. 

Investing in Communities
Our role in communities


National Grid and the Electricity Industry 
Our role in the electricity industry and how we operate the electricity transmission system in England and Wales 

The Energy Challenge
The challenge the UK faces in meeting projected energy needs over the next few decades and our role in meeting this challenge. 

The Planning Act 2008 
How companies consult with the public about major projects and our commitment to genuine and meaningful community engagement through the development of major projects. 

Overhead line construction/refurbishment 
How National Grid builds and refurbishes over head lines. 

Substation construction/refurbishment 
How National Grid replaces, upgrades or builds new substations. 

High Voltage Direct Current Electricity – technical information 
Technical information on HVDC and the situations under which we apply the technology. 

Electric and Magnetic Fields (EMFs)
Information on EMFs and how our transmission network is designed and operated to ensure public safety. 

Environmental Impact Assessments (EIA)
Information on the Environmental Impact Assessment (EIA) and how we take the information from the EIA fully into account before a decision is made as to whether a proposed development can go ahead. 

Environmental and Engineering Surveys
This document explains the variety of surveys carried out during the planning stages of projects.

Undergrounding policy: Approach to existing overhead lines