Eversource 2012 Annual Report Download - page 37

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24
Item 2. Properties
Transmission and Distribution System
As of December 31, 2012, NU and our electric operating subsidiaries owned the following:
Electric
Electric
NU
Distribution
Transmission
Number of substations owned
557
60
Transformer capacity (in kVa) 41,504,000 17,827,000
Overhead lines (distribution in pole miles and
transmission in circuit miles)
51,988
3,835
Capacity range of overhead transmission lines (in kV)
69 to 345
Underground lines (distribution in conduit bank miles and
transmission in cable miles)
12,656
677
Capacity range of underground transmission lines (in kV) 69 to 345
CL&P
NSTAR Electric
PSNH
WMECO
Distribution
Transmission
Distribution
Transmission
Distribution
Transmission
Distribution
Transmission
Number of substations owned
212
19
138
20
163
13
44
8
Transformer capacity (in kVa)
18,487,000
3,117,000
11,374,000
9,575,000
7,626,000
3,868,000
4,017,000
1,267,000
Overhead lines (distribution in
pole miles and transmission
in circuit miles) 18,375
1,625
16,570
708
13,253
1,010
3,790
492
Capacity range of overhead
transmission lines (in kV)
69 to 345
115 to 345
115 to 345
69 to 345
Underground lines (distribution
in conduit bank miles and
transmission in cable miles)
1,154
403
9,508
243
1,704
1
290
30
Capacity range of underground
transmission lines (in kV)
69 to 345
115 to 345
115
115
NSTAR
NU
CL&P
Electric
PSNH
WMECO
Underground and overhead
line transformers in service
683,514
337,727
130,787
167,523
47,477
Aggregate capacity (in kVa)
49,357,003
28,398,407
10,111,403
6,995,487
3,851,706
Electric Generating Plants
As of December 31, 2012, PSNH owned the following electric generating plants:
Type of Plant
Number
of Units
Year
Installed
Claimed
Capability*
(kilowatts)
Total - Fossil-Steam Plants
5 units
1952-74
935,343
Total - Hydro
20 units
1901-83
68,994
Total - Internal Combustion
5 units
1968-70
101,869
Total - Biomass - Steam Plant
1 unit
1954-2006
42,594
Total PSNH Generating Plant
31 units
1,148,800
* Claimed capability represents winter ratings as of December 31, 2012. The combined nameplate capacity of the generating plants
is approximately 1,200 MW.
As of December 31, 2012, WMECO owned the following electric generating plant:
Type of Plant
Number
of Sites
Year
Installed
Claimed
Capability**
(kilowatts)
Total - Solar Fixed Tilt, Photovoltaic
2 sites
2010-11
4,100
** Claimed capability represents the direct current nameplate capacity of the plant.
CL&P did not own any electric generating plants during 2012.