National Grid 2008 Annual Report Download - page 166

BOWNE INTEGRATED TYPESETTING SYSTEM
CRC: 21729
Name: NATIONAL GRID
Date: 17-JUN-2008 03:10:51.35Operator: BNY99999TPhone: [phone]Site: BOWNE OF NEW YORK
Y59930.SUB, DocName: EX-2.B.5.1, Doc: 4, Page: 70
Description: EXH 2(B).5.1
0/2549.00.00.00Y59930BNY
[E/O] EDGAR 2 *Y59930/549/2*
BOWNE INTEGRATED TYPESETTING SYSTEM
CRC: 21729
Name: NATIONAL GRID
Date: 17-JUN-2008 03:10:51.35Operator: BNY99999TPhone: [phone]Site: BOWNE OF NEW YORK
Y59930.SUB, DocName: EX-2.B.5.1, Doc: 4, Page: 70 Description: EXH 2(B).5.1
0/2549.00.00.00Y59930BNY
[E/O] EDGAR 2 *Y59930/549/2*
Its remaining non-regulated businesses are not treated as a segment but are instead classified and reported as non-re
g
ulated
and other operations. Further information about each of these segments and other operations is set out below.
National Grid’s principal subsidiaries are: National Grid Electricity Transmission plc, which owns its U.K. electricity transmission
business; National Grid Gas plc, which owns its U.K.
g
as transmission and U.K.
g
as distribution businesses; and National Grid
USA, the holding company for its U.S. electricity and gas distribution and electricity transmission businesses. National Grid’s
U.S. subsidiary companies include Nia
g
ara Mohawk Power Corporation, Massachusetts Electric Company and New En
g
land
Power Company.
Transmission
National Grid’s transmission business operates in both the U.K. and the U.S. As a consequence of the respective economic
and regulatory environments, National Grid reports the results of its transmission business as two segments; Transmission –
U.K. and Transmission – U.S.
Transmission – U.K.
National Grid owns the electricity transmission system in En
g
land and Wales. Its electricity assets comprise approximately
8,671 miles of overhead line, about 420 miles of under
g
round cable and 337 substations at 244 sites. National Grid is the Great
Britain System Operator responsible for mana
g
in
g
the operations of both the En
g
land and Wales transmission system that it
owns and also the two high-voltage electricity transmission networks in Scotland.
Day-to-day operation of the Great Britain electricity transmission system involves the continuous real-time matchin
g
of demand
and
g
eneration output, ensurin
g
the stability and security of the power system and the maintenance of satisfactory volta
g
e and
frequency.
National Grid also owns the
g
as transmission network in Great Britain. This comprises 4,326 miles of hi
g
h pressure pipe and 26
compressor stations, connectin
g
to ei
g
ht re
g
ional distribution networks and third party independent systems for onward
transportation of
g
as to end consumers. National Grid operates the
g
as transmission network, which includes balancin
g
supply
and demand, maintaining satisfactory system pressures and ensuring gas quality standards are met.
National Grid owns and operates the U.K. assets, and a portion of the sub-sea cables that comprise the electricity connector
between En
g
land and France, as part of a joint arran
g
ement with the French transmission operator, RTE. National Grid also
owns and operates four liquefied natural gas storage facilities in the U.K.
Transmission – U.S.
In the U.S., National Grid owns and operates an electricity transmission network of approximately 8,600 miles spannin
g
upstate
New York, Massachusetts, Rhode Island, New Hampshire and Vermont. Its U.S. transmission facilities operate at volta
g
es
ran
g
in
g
from 69 kV to 345kV, utilisin
g
nearly 8,500 miles of overhead lines, 89 miles of under
g
round cable and 501 substations.
National Grid is the lar
g
est electricity transmission service provider in the northeastern U.S. by reference to the len
g
th of these
high-voltage transmission lines. In addition, it owns and operates a 139-mile direct current transmission line rated at 450 kV that
is a key section of an interconnector between New England and Canada.
70
• U.S. stranded cost recoveries.