WSP02437

• File Number: 8220.100.50
• Description: CRSP - Power Issues
• Basin: Colorado Mainstem
• Date: 1/1/1982
• Author: West. Sys. Coord. Co
• Title: Western Systems Coordinating Council Ten-Year Coordinated Plan Summary 1982 - 1991
• Water Supply Pro - Doc Type: Publication

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51

TRANSMISSION

Information regarding the existing interconnected bulk power
transmission system and the significant transmission facilities planned
through the next ten years is compiled annually by the Council and
provides the basis for this section. System developments which
significantly affect the reliability of the WSCC interconnected
transmission system are discussed in the "State of the WSCC Interconnected
Bulk Power System Through 1991" section of this report. The Member
Systems' planned transmission facilities are designed in accordance with
the "WSCC Rel iabil ity Criteria for System Design" which recommends that
each Member System provide sufficient transmission capacity to serve its
load, to accommodate planned interarea power transfers, and to meet its
transmission obligation to others.

As of January 1, 1982, the WSCC interconnected bulk power system
was comprised of 93,553 circuit miles of transmission. Net additions
during 1981 (4,068 circuit miles) include 1,317 miles of 500 kV, 195 miles
of 345 kV, 1,651 miles of 230 kV and 905 miles of 115-161 kV transmissiDn.
Figure 12 and Table 40 categorize existing transmission for the total WSCC
region by voltage class, and indicate that approximately 57 percent of the
existing transmission as tabulated in Table 40 is operated at a voltage
class of 230 kV or above.

Figure 13 and Table 41 present information regarding the
significant transmission additions planned for the 1982-1991 period. The
planned transmission additions are categorized by voltage class and the
corresponding circuit miles are summarized for each of the four WSCC
areas. Transmission additions which are considered significant include
interconnections to the system from major generation sources,
interconnections between control areas, and transmission lines which are
significant to interconnected system operation. The total net
transmission circuit miles (17,697) planned for the 1982-1991 period
represent a 19 percent increase over the existing circuit miles as of
January 1, 1982. Approximately 72 percent of the planned significant
transmission circuit mile net additions are of the 345 kV voltage class or
higher. The total net transmission circuit miles planned for the
1982-1991 period represent a 12.2 percent decrease compared with the
planned circuit miles reported last year for the 1981-1990 period.

A comparison of the transmission plans reported January 1, 1981
for the 1981-1990 period and those reported January 1, 1982 for the
1982-1991 period indicates a delay of one or more years for a number of
facilities. Most delays are due to financial considerations, reduced load
growth, and regulatory and environmental intervention affecting the
in-service dates of generating facilities.

A copy of the map titled "WSCC Planned Facilities Through 1991
and Possible Transmission Beyond This Period" is included in the Appendix.
The existing network as of January 1, 1982 is illustrated in black and
significant facility additions planned for the 1982-1991 period are
depicted in color. Parenthetical numbers on the map indicate system