Angle pylon – a type of pylon
used to change the direction of the
connection. These typically have a
wider base and thicker steel than
AONB (Area of Outstanding Natural Beauty)
– an area of countryside which has been designated
for conservation by Natural England due to its
significant landscape value.
BEIS (Department of Business,
Energy and Industrial Strategy)
– the government department that
decides whether a Nationally
Significant Infrastructure Project
(NSIP) relating to energy is given
Biological heritage site – the term for a Local
Wildlife Site (LWS) in Lancashire. An LWS is an area
that is locally important for the conservation of
wildlife. They are identified and selected by a range of
partners including local authorities, local wildlife
groups and Natural England.
– the distance between
overhead lines and things such as
the ground, buildings, roads,
railways, wind turbines and other
– the wire strung
between pylons, used for
CSEC (Cable Sealing End Compound)
compound containing the structures needed to
connect a high voltage overhead line to an
CSEP (Cable Sealing End Platform) pylon – a pylon with a
platform attached containing the
structures needed to connect a 132kV
overhead line to an underground
cable. A CSEP pylon may have one or
two platforms depending on whether
it is a single or double circuit pylon.
CWS (County Wildlife Site) – a designated area for
the conservation of wildlife.
DCO (Development Consent
- the form of consent given
by a government minister for a
Nationally Significant Infrastructure
Project (NSIP) to be built.
– a method of installing
underground cable by digging a
trench. It does not require the cable
to be inside a pipe or a tunnel.
– a double circuit
transmission line carries two
electric circuits – one on each side
of the pylon.
Draft Order Limits – the defined boundaries
showing all of the places where we plan to carry out
work as part of this project.
– a large round object used to
carry electrical cables or conductors.
– connecting the metal
parts of electrical equipment to the
ground for safety reasons.
EIA (Environmental Impact
– the process of
carrying out surveys to assess the
potential effects that the project may
have on the environment.
EMF (electric and magnetic
– electric and magnetic fields
are the area around a conductor
where a force will be experienced
by a charge. For more information
please visit www.emfs.info.
ENW (Electricity North West Limited) – the
distribution network operator for the north west of
England, i.e. the company that owns, operates and
maintains the electricity distribution network in this
area. This is the network that carries electricity from
the national electricity transmission system (operated
by us) to your home or business.
ES (Environmental Statement)
– a report setting out what likely
effects we believe the project will
have on the environment and how
we propose to minimise them.
An ES is required by law and
must meet strict criteria. We will
prepare and submit it as part of
our application for consent.
GSP (Grid Supply Point)
a substation forming part of the
national electricity transmission
system, which supplies electricity
to a distribution network operator
(e.g. Electricity North West) or other
directly connected customer.
GW (gigawatt) – a unit for measuring power. A
gigawatt is equal to one billion watts, or one
thousand megawatts (MW).
HDD (Horizontal Directional Drilling) a method of installing
underground cable by drilling a
duct rather than digging a trench.
Head house – a structure that we need to build at
each end of the tunnel under Morecambe Bay. Each
would contain fans to ventilate the tunnel and office
facilities, as well as providing access to the tunnel for
– 275kV and over.
Our transmission lines generally
operate at 275kV and 400kV. Lower
voltage lines such as 132kV and
33kV are generally owned by local
Holford Rules – industry guidelines for the routeing
of new high voltage overhead lines.
– part of a pylon used to
attach the conductors to the tower
and prevent the steel pylon from
being charged with electricity.
– a piece of equipment
needed to join together two pieces
of underground electric cable.
kV (kilovolt) – a unit for measuring voltage. A kilovolt
is equal to one thousand volts.
Lattice pylon or tower – the traditional design of
pylon that we use to carry overhead lines.
or placing existing overhead lines
underground to reduce the total
– a small permanent
piece of equipment installed above
ground near joint bays to allow
testing and maintenance.
– a term used to
describe sources of electricity
generation that emit less carbon
dioxide as a by-product.
Lower height lattice pylon – an alternative
pylon design for carrying a 400kV connection that is
typically around 10m lower in height than a traditional
lattice tower but wider.
Low Level Waste Repository – a site close to Drigg
where the UK’s low level radioactive waste is stored.
Moorside – the name of the proposed nuclear power station that NuGeneration Ltd (NuGen) is proposing to build near Sellafield in west Cumbria, and that we need to connect to the national electricity transmission system.
National Grid – we are the company that owns the
electricity transmission system in England and Wales
and operate it across Great Britain. We are
responsible for developing new high voltage
connections in England and Wales.
NSIP (Nationally Significant
– a large
scale development that requires a
type of consent known as a
‘development consent order’
(DCO) under the Planning Act 2008.
This includes overhead electric
connections of 132kV and above.
NTS (Non technical summary) – a summary of the
findings outlined in the main body of the Preliminary
Environmental Information (PEI) Report
NuGen (NuGeneration Ltd) – the developer of
Moorside, the proposed nuclear power station that
we need to connect to the national electricity
NWCC (North West Coast Connections) project
– the name of our project to develop a connection
from Moorside into the national electricity
Ofgem (Office of Gas and
– the regulator
for the gas and electricity markets in
PEI (Preliminary Environmental Information)
Report – a report setting out what the likely
environmental effects of our proposals would be and
how we propose to minimise them.
Planning Inspectorate – a government agency that
deals with applications for consent for Nationally
Significant Infrastructure Projects (NSIPs).
Pylon – a metal structure used to carry overhead lines
including conductors, insulators and other fittings.
Ramsar site – a wetland designated under the
Ramsar Convention as being internationally important.
Route alignment – the exact line that we propose
our new connection could follow.
Route corridor – a broad ribbon of land identified in
2014 as somewhere that we could potentially route
SAC (Special Area of Conservation) – an area
designated under the Habitats Directive for
internationally important species or habitats.
– an innovative
process for creating access roads
that involves mixing a compound
into existing soil to form a solid road
which can be used by construction
traffic. The soil can then be
ploughed back to its original state
once it’s no longer needed.
SPA (Special Protection Area) – an area
designated under the Birds Directive for
internationally important species or habitats.
Span – the distance between two pylons or wood poles.
SSSI (Site of Special Scientific Interest) – an
area designated by Natural England for the
conservation of wildlife or geology.
– a person or
organisation with a recognised
interest in the project. The Planning
Act 2008 sets out a list of statutory
stakeholders that we must consult
before submitting our application
– a high level
suggestion for the direction that our
new connection could potentially
take and where it could connect into.
Substation – a structure for changing the voltage of
electricity as it moves around our transmission
system, and/or ‘switching’ electrical circuits, i.e.
connecting and disconnecting transmission lines to
and from the network.
a substation that allows us to connect
and disconnect transmission lines
to and from the network. This could
be while we carry out maintenance,
for example, or to isolate a fault on
one of the lines.
– the length of time we
would need the temporary ENW
lines in place would vary depending
on the section of our connection. In
some areas they may be retained
for up to eight years so while they
are not permanent structures they
will not be removed immediately.
– metal sheets used
to form a temporary surface when
building an access road for
– a piece of electrical
equipment that changes the voltage
of an electrical connection to a
higher or lower voltage as required.
– the process of
moving energy from where it is
generated to where it is needed.
Vallum – an earthen rampart from Roman times.
Wood pole – a wooden structure used to carry
lower voltage overhead lines including conductors, insulators and other fittings.