Exhibit 8

List of Subsidiaries

Name	Jurisdiction of
	Incorporation or Organization
186K (EMPLOYERS) LIMITED	England & Wales
186K LIMITED	England & Wales
99.999 LIMITED	England & Wales
ADVANTICA CORPORATE VENTURES LIMITED	England & Wales
ADVANTICA INC.	Pennsylvania
ADVANTICA LIMITED	England & Wales
ADVANTICA QA LIMITED	England & Wales
ADVANTICA STONER LIMITED	England & Wales
ADVANTICA TECHNOLOGIES (EMPLOYERS) LTD	England & Wales
ADVANTICA TECHNOLOGIES INC	Delaware
ADVANTICA TECHNOLOGIES LIMITED	England & Wales
AEMC, L.L.C.	Delaware
AERIAL GROUP LIMITED	England & Wales
AERIAL UK LIMITED	England & Wales
AGL SYSTEMS INTERNATIONAL LIMITED	England & Wales
AMPLE DESIGN LIMITED	England & Wales
ARBUCKLE ACRES, INC	New York
ARTERION (EMPLOYERS) LIMITED	England & Wales
ARTERION LIMITED	England & Wales
ARTERION TECHNOLOGIES LIMITED	England & Wales
ASSETHALL LIMITED	England & Wales
BASSLINK PTY LIMITED	Australia
BEEGAS NOMINEES LIMITED	England & Wales
BRITISH TRANSCO CAPITAL INC	Delaware
BRITISH TRANSCO FINANCE INC	Delaware
BRITISH TRANSCO FINANCE (NO 1) LIMITED	Cayman Islands
BRITISH TRANSCO FINANCE (NO 2) LIMITED	Cayman Islands
BRITISH TRANSCO FINANCE (NO 3) LIMITED	England & Wales
BRITISH TRANSCO FINANCE (NO 5) LIMITED	England & Wales
BRITISH TRANSCO FINANCE (NO 6)	Cayman Islands
BRITISH TRANSCO INTERNATIONAL FINANCE BV	The Netherlands
BSC CO LIMITED	England & Wales
CENTRAL EUROPE TELCOM HOLDINGS B.V.	The Netherlands
COGSYS LIMITED	England & Wales
CONTIGUOUS LIMITED	England & Wales
EASTLANDS (BENEFITS ADMINISTRATION) LIMITED	England & Wales
EASTLANDS LIMITED	England & Wales
ELECTRACOM LIMITED	England & Wales
ELEXON LIMITED	England & Wales
ENERGI LIMITED	England & Wales
ENERGIS SERVICES LIMITED	England & Wales
ENERGY MARKET OPERATIONS LIMITED	England & Wales
ENERGY SETTLEMENTS AND INFORMATION SERVICES	England & Wales
LIMITED
ENEX OPERATIONS LIMITED	England & Wales
ENMO LIMITED	England & Wales
EPFA LIMITED	England & Wales
EPFAL LIMITED	England & Wales
EUA BIOTEN, INC.	Massachusetts
EUA ENERGY INVESTMENT CORPORATION	Massachusetts
EUA FRC INVESTMENT 1	Massachusetts
FASTNET CALOOSAHATCHEE COMMUNICATIONS LIMITED	British Virgin Islands
FIRST CONNECT LIMITED	England & Wales
FIRST CONNECT UTILITIES LIMITED	England & Wales
FIRST POINT SERVICES LIMITED	England & Wales
FIRST POINT SOLUTIONS LIMITED	England & Wales

Name	Jurisdiction of
	Incorporation or Organization
FPLTELECOM LIMITED	England & Wales
FULCRUM CONNECTIONS (EMPLOYERS) LIMITED	England & Wales
FULCRUM CONNECTIONS LIMITED	England & Wales
GAS RESEARCH & TECHNOLOGY CENTRE LIMITED	England & Wales
GEMSTONE SOFTWARE LIMITED	England & Wales
GRANITE STATE ELECTRIC COMPANY	New Hampshire
GRIDAMERICA LLC	Delaware
GRID INTERNATIONAL LIMITED	England & Wales
GRID INVESTMENT HOLDINGS LIMITED	England & Wales
GRIDCOM AERIAL SITES PLC	England & Wales
GRIDCOM LIMITED	England & Wales
GRIDCOM (UK) LIMITED	England & Wales
GRIDMET LIMITED	England & Wales
GRIDNAT LIMITED	England & Wales
GRID ONE LIMITED	England & Wales
GRTC LIMITED	England & Wales
HCE PEPPERELL, INC	New York
HOLDCO PARTICIPACOES LTDA (50%)	Brazil
HUDSON POINTE, INC	New York
INFRASTRUCTURE TECHNOLOGY GROUP LIMITED	England & Wales
INFRASTRUCTURE TECHNOLOGY HOLDINGS BV	The Netherlands
INTELIG TELECOMUNICACOES LTDA (50%)	Brazil
INTERNATIONAL POWER SYSTEMS LIMITED	England & Wales
IPS LIMITED	England & Wales
ITG LIMITED	England & Wales
JACKSON & LUTTMAN LIMITED	England & Wales
JOINT RADIO COMPANY LIMITED (50%)	England & Wales
JVCO PARTICIPACOES LTDA (50%)	Brazil
LAND MANAGEMENT AND DEVELOPMENT, INC	New York
LANDRANCH LIMITED	England & Wales
LANDWEST, INC	New York
LATTICE ENERGY SERVICES (EMPLOYERS) LTD	England & Wales
LATTICE ENERGY SERVICES LIMITED	England & Wales
LATTICE ENTERPRISES LIMITED	England & Wales
LATTICE GROUP EMPLOYEE BENEFIT TRUST LIMITED	England & Wales
LATTICE GROUP (EMPLOYERS) LTD	England & Wales
LATTICE GROUP HOLDINGS (EMPLOYERS) LTD	England & Wales
LATTICE GROUP HOLDINGS LIMITED	England & Wales
LATTICE GROUP INTERNATIONAL HOLDINGS LIMITED	England & Wales
LATTICE GROUP PLC	England & Wales
LATTICE GROUP SERVICES (AGENCY) LIMITED	England & Wales
LATTICE GROUP SERVICES LIMITED	England & Wales
LATTICE GROUP TRUSTEES LIMITED	England & Wales
LATTICE GROUP US HOLDINGS, INC.	Delaware
LATTICE INTELLECTUAL PROPERTY LIMITED	England & Wales
LATTICE LAND DEVELOPMENTS LIMITED	England & Wales
LATTICE LAND INVESTMENTS LIMITED	England & Wales
LATTICE LIMITED	England & Wales
LATTICE LNG HOLDINGS LIMITED	England & Wales
LATTICE LNG LIMITED	England & Wales
LATTICE OPSCO LIMITED	England & Wales
LATTICE PROPERTY (EMPLOYERS) LIMITED	England & Wales
LATTICE PROPERTY HOLDINGS LIMITED	England & Wales
LATTICE PROPERTY PORTFOLIO LIMITED	England & Wales
LATTICE TELECOM FINANCE (NO 1) LIMITED	Isle of Man
LATTICE TELECOMMUNICATIONS ASSET DEVELOPMENT	England & Wales
COMPANY LIMITED
LATTICE TELECOMS LIMITED	England & Wales
LATTICE UTILITIES LIMITED	England & Wales
LOUGHBOROUGH PARK MANAGEMENT LIMITED	England & Wales
MAINSTREAM FORTY-SEVEN LIMITED	England & Wales
MANQUEHUE NET S.A.	Chile
MASSACHUSETTS ELECTRIC COMPANY	Massachusetts
METROWEST REALTY LLC	Delaware
MINOA FARMS DEVELOPMENT CO. LLC	New York
MOREAU PARK, INC	New York
NANTUCKET ELECTRIC COMPANY	Massachusetts
NATGRID FINANCE HOLDINGS LIMITED	England & Wales

Name	Jurisdiction of
	Incorporation or Organisation
NATGRID FINANCE LIMITED	England & Wales
NATGRID HOLDINGS LIMITED	England & Wales
NATGRID INVESTMENTS LIMITED	England & Wales
NATGRID LIMITED	England & Wales
NATIONAL GRID AUSTRALIA GP PTY LTD	Australia
NATIONAL GRID AUSTRALIA LLP	Australia
NATIONAL GRID AUSTRALIA PTY LIMITED	Cayman Islands
NATIONAL GRID BRAZIL B.V.	The Netherlands
NATIONAL GRID BRAZIL FINANCE	England & Wales
NATIONAL GRID BRAZIL TRANSMISSION B.V.	The Netherlands
NATIONAL GRID CENTRAL EUROPE B.V.	The Netherlands
NATIONAL GRID CHILE B.V.	The Netherlands
NATIONAL GRID COMMUNICATIONS, INC.	Massachusetts
NATIONAL GRID COMPANY PLC	England & Wales
NATIONAL GRID EIGHTEEN LIMITED	England & Wales
NATIONAL GRID EIGHT LIMITED	England & Wales
NATIONAL GRID ELEVEN LIMITED	England & Wales
NATIONAL GRID FIFTEEN LIMITED	England & Wales
NATIONAL GRID FINANCE B.V.	The Netherlands
NATIONAL GRID FIVE LIMITED	England & Wales
NATIONAL GRID FOUR LIMITED	England & Wales
NATIONAL GRID FOURTEEN LIMITED	England & Wales
NATIONAL GRID GENERAL PARTNERSHIP	Delaware
NATIONAL GRID GOLD LIMITED	England & Wales
NATIONAL GRID HOLDINGS B.V.	The Netherlands
NATIONAL GRID HOLDINGS INC.	Delaware
NATIONAL GRID HOLDINGS LIMITED	England & Wales
NATIONAL GRID HOLDINGS ONE PLC	England & Wales
NATIONAL GRID HOLLAND LIMITED	England & Wales
NATIONAL GRID INDIA B.V.	The Netherlands
NATIONAL GRID INDUS B.V.	The Netherlands
NATIONAL GRID INTERNATIONAL LIMITED	England & Wales
NATIONAL GRID (IOM) UK LTD	Isle of Man
NATIONAL GRID (IRELAND) 1 LIMITED	Republic of Ireland
NATIONAL GRID (IRELAND) 2 LIMITED	Republic of Ireland
NATIONAL GRID IRELAND THREE	Republic of Ireland
NATIONAL GRID JERSEY HOLDINGS FIVE LIMITED	Jersey
NATIONAL GRID JERSEY HOLDINGS FOUR LIMITED	Jersey
NATIONAL GRID JERSEY HOLDINGS THREE LIMITED	Jersey
NATIONAL GRID JERSEY HOLDINGS TWO LTD (IN LIQ’N)	Jersey
NATIONAL GRID MANQUEHUE B.V.	The Netherlands
NATIONAL GRID MARKET SERVICES LIMITED	England & Wales
NATIONAL GRID NETHERLANDS ONE BV	The Netherlands
NATIONAL GRID NETHERLANDS THREE BV	The Netherlands
NATIONAL GRID NETHERLANDS TWO BV	The Netherlands
NATIONAL GRID NINE LIMITED	England & Wales
NATIONAL GRID NINETEEN LIMITED	England & Wales
NATIONAL GRID NOMINEES LIMITED	England & Wales
NATIONAL GRID ONE LIMITED	England & Wales
NATIONAL GRID OVERSEAS LIMITED	England & Wales
NATIONAL GRID OVERSEAS TWO LIMITED	England & Wales
NATIONAL GRID POLAND B.V.	The Netherlands
NATIONAL GRID PROCUREMENT BV	The Netherlands
NATIONAL GRID PROPERTIES LIMITED	England & Wales
NATIONAL GRID RESERVE IX B.V.	The Netherlands
NATIONAL GRID RESERVE VII B.V.	The Netherlands
NATIONAL GRID RESERVE VIII B.V.	The Netherlands
NATIONAL GRID RESERVE X B.V.	The Netherlands
NATIONAL GRID SEVEN LIMITED	England & Wales
NATIONAL GRID SEVENTEEN LIMITED	England & Wales
NATIONAL GRID SIX LIMITED	England & Wales
NATIONAL GRID SIXTEEN LIMITED	England & Wales
NATIONAL GRID TEN	England & Wales
NATIONAL GRID THREE LIMITED	England & Wales
NATIONAL GRID TRANSCO EUROPE LIMITED	England & Wales
NATIONAL GRID TRANSCO GROUP LIMITED	England & Wales
NATIONAL GRID TRANSCO HOLDINGS LIMITED	England & Wales
NATIONAL GRID TRANSCO INTERNATIONAL LIMITED	England & Wales
NATIONAL GRID TRANSCO LIMITED	England & Wales
NATIONAL GRID TRANSMISSION SERVICES CORPORATION	Massachusetts
NATIONAL GRID TWELVE LIMITED	England & Wales
NATIONAL GRID TWENTY LIMITED	England & Wales
NATIONAL GRID TWENTY ONE LIMITED	England & Wales
NATIONAL GRID TWO LIMITED	England & Wales
NATIONAL GRID USA	Delaware
NATIONAL GRID USA SERVICE COMPANY, INC.	Massachusetts
NATIONAL GRID (US) HOLDINGS LIMITED	England & Wales
NATIONAL GRID (US) INVESTMENTS	England & Wales
NATIONAL GRID (US) INVESTMENTS 2	England & Wales
NATIONAL GRID (US) INVESTMENTS 3	England & Wales
NATIONAL GRID (US) INVESTMENTS 4	England & Wales
NATIONAL GRID (US) INVESTMENTS 5	England & Wales
NATIONAL GRID (US) INVESTMENTS 6	England & Wales
NATIONAL GRID US LLC	Delaware
NATIONAL GRID (US) PARTNER 1 LIMITED	England & Wales
NATIONAL GRID (US) PARTNER 2 LIMITED	England & Wales

Name	Jurisdiction of
	Incorporation or Organization
NATIONAL GRID ZAMBIA B.V.	The Netherlands
NATIONAL GRID ZAMBIA LIMITED	England & Wales
NEES COMMUNICATIONS, INC	Massachusetts
NEES ENERGY, INC.	Massachusetts
NEES TELECOMMUNICATIONS CORP.	Massachusetts
NETMAP LIMITED	England & Wales
NETWORK MAPPING LIMITED	England & Wales
NEW ENGLAND ELECTRIC TRANSMISSION CORPORATION	New Hampshire
NEW ENGLAND ENERGY INCORPORATED	Massachusetts
NEW ENGLAND HYDRO FINANCE COMPANY, INC.	Massachusetts
NEW ENGLAND HYDRO-TRANSMISSION CORPORATION	New Hampshire
NEW ENGLAND HYDRO-TRANSMISSION ELECTRIC	Massachusetts
COMPANY, INC.
NEW ENGLAND POWER COMPANY	Massachusetts
NEW ENGLAND WHOLESALE ELECTRIC COMPANY	Massachusetts
NEWHC, INC.	Massachusetts
NGC DO BRASIL PARTICIPACOES LTDA	Brazil
NGC EMPLOYEE SHARES TRUSTEE LIMITED	England & Wales
NGC ENERGY LIMITED	England & Wales
NGC (GB) LIMITED	England & Wales
NG CHICAGO I, LLC	Delaware
NG CHICAGO II, LLC	Delaware
NGC INDUS LIMITED	England & Wales
NGC IT LIMITED	England & Wales
NGC LEASING LIMITED	England & Wales
NGC LEISURE LIMITED	England & Wales
NGC TWO LIMITED	England & Wales
NGC ZAMBIA LIMITED	England & Wales
NGG (DELAWARE) LLC	Delaware
NGG FINANCE A ISLANDI EHF	Iceland
NGG FINANCE PLC	England & Wales
NGG HOLDINGS A ISLANDI EHF	Iceland
NGG LIMITED	England & Wales
NGG TELECOMS HOLDINGS LIMITED	England & Wales
NGG TELECOMS INVESTMENT LIMITED	England & Wales
NGG TELECOMS LIMITED	England & Wales
NG INVESTMENTS LIMITED	Jersey
NG JERSEY LIMITED	Jersey
NG MALTA ONE LIMITED	Gibraltar
NG MALTA TWO LIMITED	Malta
NG PROCUREMENT HOLDINGS LIMITED	England & Wales
NG PROPERTY DEVELOPMENTS LIMITED	England & Wales
NGT INSURANCE COMPANY (GUERNSEY) LIMITED	Guernsey
NGT INSURANCE COMPANY (IRELAND) LIMITED	Republic of Ireland
NGT INSURANCE COMPANY (ISLE OF MAN) LIMITED	Isle of Man
NGT METERING LIMITED	England & Wales
NGT ONSTREAM LIMITED	England & Wales
NIAGARA MOHAWK ENERGY, INC.	Delaware
NIAGARA MOHAWK HOLDINGS, INC.	New York
NIAGARA MOHAWK POWER CORPORATION	New York
NM PROPERTIES, INC.	New York
NM RECEIVABLES CORP. II	New York
NM RECEIVABLES LLC	New York
NM URANIUM, INC.	Texas
NT LIMITED	England & Wales

Name	Jurisdiction of
	Incorporation or Organization
ON STREAM ASSET MANAGEMENT SERVICES LIMITED	England & Wales
ON STREAM.COM LIMITED	England & Wales
ON STREAM DATA MANAGEMENT LIMITED	England & Wales
ON STREAM DATA PROVISION LIMITED	England & Wales
ON STREAM METERING LIMITED	England & Wales
ON STREAM METER OPERATIONS LIMITED	England & Wales
ON STREAM METER READING SERVICES LIMITED	England & Wales
ON STREAM SERVICES LIMITED	England & Wales
ON STREAM SOLUTIONS LIMITED	England & Wales
ON STREAM UTILITIES LIMITED	England & Wales
ON STREAM WORLDWIDE LIMITED	England & Wales
OPINAC ENERGY CORPORATION	Province of Ontario, Canada
OPINAC NORTH AMERICA, INC.	Delaware
OPROPRCO, INC	New York
ORIGINAL BASSLINK LIMITED	Australia
ORIGINAL BASSLINK PTY LTD	Australia
PORT GREENWICH LIMITED	England & Wales
POWERCOM LIMITED	England & Wales
RENOVA LLC	USA
RISX ENVIRONMENTAL MANAGEMENT LIMITED	Scotland
RISX LIMITED	Scotland
RIVERVIEW GALUSHA, LLC	New York
RIVERVIEW, INC	New York
RT MASTS LIMITED	England & Wales
RT MASTS (PROPERTY) LIMITED	England & Wales
SALMON SHORES, INC	New York
SALMON SHORES PARTNERSHIP	New York
SCC UNO S.A.	Chile
SECONDSITE ESTATES LIMITED	England & Wales
SECONDSITE HOLDINGS LIMITED	England & Wales
SECONDSITE LAND DEVELOPMENTS LIMITED	England & Wales
SECONDSITE LAND INVESTMENTS LIMITED	England & Wales
SECONDSITE PORTFOLIO SOLUTIONS LIMITED	England & Wales
SECONDSITE PROPERTY HOLDINGS LIMITED	England & Wales
SECONDSITE PROPERTY LIMITED	England & Wales
SECONDSITE PROPERTY NOMINEES (NO 1) LIMITED	England & Wales
SECONDSITE PROPERTY NOMINEES (NO 2) LIMITED	England & Wales
SECONDSITE PROPERTY PORTFOLIO LIMITED	England & Wales
SECONDSITE REGENERATION LIMITED	England & Wales
SILICA NET S.A.	Chile
SILICA NETWORKS ARGENTINA S.A.	Argentina
SILICA NETWORKS CHILE S.A.	Chile
SKYMASTS LIMITED	England & Wales
SN INVESTMENT ARGENTINA S.A.	Chile
SOFRER SA	France
SSE TRANSCO LIMITED	England & Wales
SSITET ESPANA NETWORK SERVICES SA	Spain
SST GMBH	Germany
SST TELECOM LIMITED	England & Wales
SST TOWERS COMMUNICATIONS SAS	France
STARGAS NOMINEES LIMITED	England & Wales
STC INTERNATIONAL HOLDINGS LIMITED	England & Wales
STONER ASSOCIATES AUSTRALASIA PTY LTD	Australia
STONER ASSOCIATES EUROPE LIMITED	England & Wales
SUPERGRID LIMITED	England & Wales
TELDATA INTERNATIONAL LIMITED	England & Wales
TELDATA SERVICES LIMITED	England & Wales
TELDATA SOLUTIONS LIMITED	England & Wales
TELECOM ELECTRIC LIMITED	England & Wales
TELECOM INTERNATIONAL HOLDINGS LIMITED	England & Wales
TELINK LIMITED	England & Wales
THE ELECTRICITY TRANSMISSION COMPANY LIMITED	England & Wales
THE NARRAGANSETT ELECTRIC COMPANY	Rhode Island
THE NATIONAL GRID GROUP QUEST TRUSTEE COMPANY	England & Wales
LIMITED

Name	Jurisdiction of
	Incorporation or Organization
THE NATIONAL GRID INVESTMENTS COMPANY	England & Wales
TOREN CV	The Netherlands
TRANSCO ASSET MAINTENANCE LIMITED	England & Wales
TRANSCO ASSET MAINTENANCE (SCOTLAND) LIMITED	England & Wales
TRANSCO ASSET MAINTENANCE (WALES) LIMITED	England & Wales
TRANSCO ASSET MANAGEMENT LIMITED	England & Wales
TRANSCO ASSET MANAGEMENT (SCOTLAND) LIMITED	England & Wales
TRANSCO ASSET MANAGEMENT (WALES) LIMITED	England & Wales
TRANSCO CONNECTIONS LIMITED	England & Wales
TRANSCO CONNECTIONS (SCOTLAND) LIMITED	England & Wales
TRANSCO CONNECTIONS (WALES) LIMITED	England & Wales
TRANSCO EMERGENCY SERVICES LIMITED	England & Wales
TRANSCO EMERGENCY SERVICES (SCOTLAND) LIMITED	England & Wales
TRANSCO EMERGENCY SERVICES (WALES) LIMITED	England & Wales
TRANSCO (EMPLOYERS) LTD	England & Wales
TRANSCO HOLDINGS (EMPLOYERS) LTD	England & Wales
TRANSCO HOLDINGS PLC	England & Wales
TRANSCO LNG STORAGE LIMITED	England & Wales
TRANSCO METERING SERVICES LIMITED	England & Wales
TRANSCO METERING SERVICES (SCOTLAND) LIMITED	England & Wales
TRANSCO PIPELINE CONSTRUCTORS LIMITED	England & Wales
TRANSCO PIPELINE CONSTRUCTORS (SCOTLAND) LIMITED	England & Wales
TRANSCO PIPELINE CONSTRUCTORS (WALES) LIMITED	England & Wales
TRANSCO PIPELINES LIMITED	England & Wales
TRANSCO PIPELINES (SCOTLAND) LIMITED	England & Wales
TRANSCO PIPELINES (WALES) LIMITED	England & Wales
TRANSCO PLC	England & Wales
TRANSCO TELECOMMUNICATIONS ASSET DEVELOPMENT	England & Wales
COMPANY LIMITED
TRANSCO TRANSPORTATION COMPANY LIMITED	England & Wales
TRANSGRID LIMITED	England & Wales
UPPER HUDSON DEVELOPMENT INC	New York
UTILITY METERING SERVICES LIMITED	England & Wales
VESAS LIMITED	England & Wales
WAYFINDER GROUP, INC.	Massachusetts