20090914Angell Direct.pdf

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BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION
IN THE MATTER OF THE APPLICATION
OF IDAHO POWER COMPANY FOR A
CERTIFICATE OF PUBLIC CONVENIENCE
AND NECESSITY FOR THE COLUMIA
SUBSTATION, THE COLUMIA TO KUNA
138 KV TRASMISSION LINE,
RECONSTRUCTION OF THE CALDWELL TO
HUBBAR 230 KV TRASMISSION LINE,
AND RELATED TRASMISSION AN
DISTRIBUTION FACILITIES
CASE NO. IPC-E-09-26
IDAHO POWER COMPANY
DIRECT TESTIMONY
OF
DAVID M. ANGELL
1 Q.Please state your name, business address,
2 and present occupation.
3 A.My name is David Angell and my business
4 address is 1221 West Idaho Street, Boise, Idaho. I am
5 employed by Idaho Power Company (" Idaho Power" or
6 "Company") as the Manager of Delivery Planning.
7 Q.What is your educational background?
8 A.I graduated in 1984 and 1986 from the
9 University of Idaho, Moscow, Idaho, receiving a Bachelor of
10 Science Degree and Master of Engineering Degree in
11 Electrical Engineering , respectively. I have provided
12 electrical engineering instruction for both the University
13 of Idaho and Boise State University. Most recently I
14 instructed power system analysis at Boise State University
15 during the 2009 spring semester.
16 Q.Please outline your business experience with
17 Idaho Power.
18 A.From 1986 to 1996, I was employed by Idaho
19 Power as an engineer in both communications and protection
20 systems. In 1996, I became the Engineering Leader of
21 System Protection and Communications. I held this position
22 until 2004, when I transferred to Transmission and
23 Distribution Planning. During the fall of 2006, I accepted
24 the positions of System Planning Leader and Manager ofAngell, DI 1
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1 Delivery Planning. I have been managing Idaho Power's load
2 research, interconnected-transmission system, sub-
3 transmission, and distribution planning since 2006.
4 Q.Can you describe Idaho Power's process for
5 planning facilities to provide electric service to
6 communi ties?
7 A.Yes. Planning engineers begin by
8 establishing the "build-out" electrical load for a
9 community. Our planning engineers apply electrical load
10 densities based on the zoning plan included in the
11 community's comprehensive plan. The load of each zone is
12 aggregated to determine the community's build-out load.
13 Substation service zones are identified based on a maximum
14 of eight 12.5 kilovolt ("kV") feeders and four 34.5 kV
15 feeders per substation. This allows a typical substation to
16 service up to 80 megawatts ("MW").
17 The substation service zones are arranged for
18 complete coverage of the electrical load and for the
19 ability to provide load service to adjacent substation
20 service areas. Idaho Power arranges the load service area
21 in diamond shaped service zones. The engineers then arrange
22 distribution circuits within each service zone. This
23 results in a grid of substations with distribution circuits
24 that serve a particular zone and have normally openAngell, DI 2
Idaho Power Company
1 connections to adjacent zone distribution circuits for
2 reliable service during circuit outages. This planning
3 technique is consistent with those described in Power
4 Distribution Planning Reference Book, Second Edition, by H.
5 Lee Willis, 2004, Marcel Dekker, Inc, New York.
6 Once the long term plan is established, engineers
7 determine when and how to construct the system by
8 monitoring load development. The distribution circuit peak
9 winter and summer electrical demands are tracked in a
10 database. Additionally, the engineers monitor the
11 residential and commercial development and occupancy rates
12 to forecast the five year distribution circuit load.
13 Finally, proj ects are initiated years in advance of the
14 need to allow time to acquire permits and construct the
15 facilities.
16 Q.Has there been community involvement in
17 siting electric facilities?
18 A.In 2005, Idaho Power began the first
19 community advisory committee to determine the long term,
20 build out of electric facilities in the Treasure Valley.
21 The committee was made up of elected officials,
22 jurisdictional planners, civic leaders, private
23 business/developers, and residents from across the Treasure
24 Valley. The committee developed a facility siting criteriaAngell, DI 3
Idaho Power Company
1 to guide them in location of major substations and
2 transmission lines. Then they proposed transmission line
3 routes and substation locations to serve the forecasted
4 build-out electrical load, producing the Treasure Valley
5 Electric Plan.
6 Q.How does Idaho Power provide electricity to
7 the city of Kuna (the "City") and to Kuna' s area of impact?
8 A.The City is served by distribution circuits
9 from the Kuna substation located at 135 W. Shortline Street
10 in Kuna. Kuna' s area of impact is predominately served by
11 distribution circuits from the Mora substation located on
12 Cloverdale Road north of Deer Flat Road.
13 Q.How does Idaho Power provide electrici ty to
14 the two substations that serve the city of Kuna and its
15 area of impact?
16 A.The Kuna substation is presently served in a
17 radial fashion, meaning it is served by a single
18 transmission line. With a single transmission source,
19 service is subj ect to transmission line outages. The
20 radial transmission line serving the Kuna substation is
21 from the Bowmont - Mora 138 kV transmission line as shown
22 in Attachment A to the Application. In 1975, this line was
23 built with 230 kV insulation and Idaho Power plans to
24 operate the line at 230 kV with the addition of theAngell, DI 4
Idaho Power Company
1 Hemingway substation. The Mora substation is served by 138
2 kV transmission connections to Boise Bench, Bowmont, and
3 Cloverdale.
4 Q.Has the Kuna area experienced electrical
5 load growth?
6 A.Yes, the Kuna area experienced an 8 percent
7 annual electrical load growth rate prior to the economic
8 recession. Idaho Power has planned for a 1.9 percent annual
9 service area growth rate for many years. A detailed
10 analysis completed in August 2009 has resulted in an
11 adjustment down to 1.7 percent annually. However, localized
12 areas wi thin the service area experience growth rates which
13 greatly exceed the service terri tory-wide rate.
14 Q.Does Idaho Power have plans for future
15 electrical facilities in the Kuna area of impact?
16 A. Yes, there are several projects planned for
17 the area. Idaho Power constantly reviews and updates its
18 short term (5 year) and long term (20 year) projected loads
19 for its service terri tory and then develops plans and
20 alternatives to reliably supply that forecasted load. The
21 proj ected loads for the Kuna area of impact are beyond our
22 present facilities' capabilities. The plans developed to
23 serve this load have led to several proj ects, both for
24 capacity increases and improved reliability. The firstAngell, DI 5
Idaho Power Company
1 being the addition of new substations along with the
2 associated distribution circuits to service future area
3 load growth. There are also additional transmission
4 projects related to these future substations as well as the
5 integration of the power delivered at the Hemingway
6 substation into the Treasure Valley. These additional
7 transmission lines will also provide improved electric
8 service reliability to the Kuna area of impact.
9 Q.How will the Kuna City 09-03-Z0A - Overlay
10 District Ordinance Amendment impact Idaho Power's ability
11 to provide reliable service in general and in Kuna
12 specifically?
13 A.The proposed Overlay District Amendment
14 prohibits construction of new poles or taller poles and
15 substation equipment within the area covered by the
16 Overlay. As a result it will have significant impacts on
17 both our ability to provide reliable service to Kuna and
18 the surrounding area. It will also have a maj or impact on
19 our ability to operate our 230 kV system reliably in the
20 entire Soutwest Idaho/eastern Oregon service area. with
21 respect to service specifically to the Kuna area, there are
22 four projects planned for construction in the near term
23 (wi thin the next five years) that I will address first.
24 Three of the proj ects are related directly toAngell, DI 6
Idaho Power Company
1 serving the present and future electrical loads caused by
2 the development in the Kuna area of impact. A new
3 substation, named Columia, is planned for property north
4 of the corner of Columia Road and Kuna-Meridian Road
5 (State Highway 69). Idaho Power has purchased the land for
6 this substation and on October 13, 2005, received an Ada
7 County conditional use permit for the site. This substation
8 is located within the Overlay District and within 660 feet
9 of the State Highway 69 centerline where new poles are
10 prohibited and existing structures are restricted to their
11 present height.
12 In addition to the new Columia substation
13 structures themselves, new distribution and transmission
14 facilities will be required to provide service from - and
15 to integrate this substation.
16 Q:What distribution circuits are planned for
17 the Columia substation?
18 A.The Columbia substation will ultimately
19 include eight distribution circuits which will leave the
20 substation along the major roads. In general, the most cost
21 efficient distribution design is to place substations at
22 the center of their service area load. Idaho Power
23 followed this efficient design in locating the Columbia
24 substation, so that the planned layout of Colubmia' sAngell, DI 7
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1 feeders has two feeders in each of the four directions from
2 the substation. Idaho Power's substation and distribution
3 circuit design makes use of double circuit distribution
4 construction for the first mile out of a substation along
5 each major road to minimize the overall numer of poles
6 required for economic and aesthetic reasons. This design
7 will require utility poles where none exist today and
8 require taller poles to replace the existing facilities -
9 all of which is prohibited by the Overlay District
10 Amendmen t .
11 Q:What is the transmission service plan for
12 the Columia substation?
13 A.The transmission service plan for the
14 Columbia substation includes reconstructing the Caldwell-
15 Mora 230 kV line with double-circuit towers from the
16 Mora/Hubbard substations to the new Columia Road/State
17 Highway 69 substation. This line reconstruction would
18 require higher towers within the Overlay District.
19 Finally, Idaho Power plans to build a 138 kV
20 transmission line from the new Columbia substation to the
21 existing Kuna substation along State Highway 69. As this
22 new line runs along State Highway 69 most of its distance,
23 nearly the entire line is within the Overlay District.
24 These three projects are shown in Attachments A and B toAngell, DI 8
Idaho Power Company
1 the Application.
2 Q:Are there other near term plans or
3 facilities affected by the Overlay District ordinance?
4 A.Yes. The forth planned near term proj ect is
5 related to integration of the new Hemingway substation to
6 the Treasure Valley 230 kV transmission system. Let me
7 begin with the initial integration of the Hemingway
8 substation.
9 Idaho Power will connect the Hemingway substation to
10 the Midpoint - Summer Lake 500 kV line in 2010. A
11 transformer will be installed at Hemingway to transform the
12 electricity from 500 to 230 kV. A 230 kv line will be
13 constructed from Hemingway to the Bowmont substation with a
14 230 to 138 kv transformer to be installed at Bowmont. This
15 configuration will suffice until either the Boardman to
16 Hemingway 500 kV line or the Gateway West project is
17 constructed. Additional 230 kV transmission capacity will
18 be required at that time.
19 There are two transmission lines planned from
20 Bowmont. One will use the existing Mora-Bowmont line and
21 the other will run on a new right-of-way north to the Happy
22 Valley substation. The Kuna Overlay District will impact
23 the line to Mora as Idaho Power's planning studies indicate
24 that the line conductor will overload with the addition of,Angell, DI 9
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the Boardman to Hemingway 500 kv line. This development has
driven a plan to reconstruct of the Bowmont - Mora line
with a larger conductor. Our reconstruction plan is to
build a double-circuit tower configuration from Bowmont to
Mora with one circuit operated at 230 and the other at 138
kV. This line right-of-way crosses the Kuna Mora Road
Overlay District. Idaho Power cannot construct the new line
without placing taller towers within the Overlay District.
Q. if the proposed Overlay District Amendment
is implemented, what would be the impact of moving the
Columbia substation location?
A.Based on the Overlay District Amendment,
13 Idaho Power would not be able to build on the property
14 purchased for be Columia substation. The Overlay District
15 Amendment would not allow typical 138 kV transmission to
16 cross Highway 69 and forces Idaho Power to build the
17 substation about one mile east of Highway 69. This
18 substation location results in two additional miles of
19 double circuit and a mile of single circuit distribution
20 compared to the Columbia substation property at an
21 additional cost of approximately $500,000. Additional
22 expense would be incurred to bury the distribution circuits
23 within the overlay district at and additional cost of
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Idaho Power Company
1 approximately $350,000 per mile.
2 The Overlay District Amendment precludes the
3 placement of new or taller utility poles wi thin the overlay
4 district which eliminates construction of transmission to
5 and between the Kuna area substations. Therefore, both the
6 Kuna and Columia substations would be configured with
7 radial transmission service as opposed to the present plan
8 of network transmission service.
9 Q.What is radial service and what impact might
10 it have on cus tomers ?
11 A.Idaho Power provides three levels of
12 transmission service to substations: network, improved
13 radial, and radial. Network transmission service provides
14 more than one transmission line to a substation. As
15 described previously, the Mora substation has network
16 transmission service. It results in a capability of serving
17 the peak load during an outage of one circuit. The
18 improved radial service is compromised of two transmission
19 lines. However, it differs from network service as an
20 outage of one line may result in load shedding to maintain
21 service to as many customers as possible.
22 Radial service supplies a substation with a single
23 transmission line. Presently, the Kuna substation is
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Idaho Power Company
1 supplied in this fashion. All customers will be without
2 power when an outage of the line occurs. The radial service
3 is the least reliable as it will result in more frequent,
4 long-duration outages for the customers.
5 Q.Is this Overlay District Amendment
6 consistent with the transmission line siting criteria
7 developed by the Treasure Valley Community Advisory
8 Committee?
9 A.The proposed Overlay District Amendment is
10 in conflict with the transmission line siting criteria
11 developed by the Treasure Valley Community Advisory
12 Committee (CAC). The following is from page 25 of the
13 Treasure Valley Electric Plan Report:
14 1. What are important issues to consider when15 locating transmission lines in the Treasure Valley?
16 . Build transmission lines along or through
17 undeveloped corridors or undevelopable ground18 where possible.
19 . Secure corridors early-sooner rather than20 later. Use a 10-year, at minimum, planning21 horizon.
22 . Locate transmission corridors with23 transportation corridors. Use established freeway24 and highway corridors. ( emphas i s added)
25 . Utilize public lands where possible for 500 kv26 lines.
27 . Consider the value of properties adjacent to28 transmission corridors.
29 · Make sure the proposed or approved corridors30 are included on planning maps or future land31 acquisition maps. Work towards clarity on local
32 comprehensive committees and plans.
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1 . Avoid residential areas, schools, ridge tops,
2 high population areas, and proj ected growth3 areas.
4 2. Where would you like to see transmission lines
5 enter the Treasure Valley?
6 · Northwest and southeast
7 . Along railroad corridor
8 · Kuna-Mora Road (emphasis added)
9 · Use existing Brownlee-Boise Bench corridor10 · Follow existing PacifiCorp 500 kV line route
11 . From the north, following Highway 16
12 · Use existing Midpoint-Boise Bench corridor
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14 The committee specifically identified highways as a
15 preferred siting transmission line location in order to
16 avoid residential and school areas. Additionally, they
17 recommended the Kuna-Mora Road for transmission line
18 placement as it has been identified for expansion into a
19 four lane highway.
20 Q.Are the above recommendations from the Treasure
21 Valley Electrical Plan consistent with other Community
22 Advisory Committee Groups Idaho Power has worked with?
23 A.Yes, Idaho Power has convened three subsequent
24 community advisory committees in the Wood River Valley,
25 Magic Valley, and our Eastern Idaho service territory. Each
26 of the committees has identified transportation corridors
27 for placement of transmission lines. The following excerpts
28 are from the three committees:
29 Wood River CAC - "Utilize existing/shared utility and30 transportation. corridors where feasible"
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Magic Valley CAC - "Utilize existing electrical and
transportation corridors where feasible when siting
new electrical transmission facilities"
Eastern Idaho CAC - "Use major/existing corridors and
identified right of ways (i. e. transportation, BLM,
USFS) where feasible; be flexible and consider
potential impacts"
9 Q.Are the facilities identified in this case
10 to be builtin the City of Kuna' s area of impact, and
11 within the designated Overlay District, required in order
12 to continue to provide service to Kuna?
13 A.The Company must construct facilities in the
14 Kuna area to meet its continuing obligation to serve
15 customers and to provide reliable service. Thus, the
16 Company is requesting an Order from the Commission
17 affirming that the public convenience and necessity
18 requires the same. The proposed facilities are required in
19 order to provide adequate and reliable service to the City,
20 and to the surrounding areas of western Ada County.
21 Alternatives to the proposed facilities are more costly,
22 and will be less reliable not only for Kuna, but also for
23 the larger transmission system. if the Company is not
24 allowed to erect new utility poles and expand existing
25 structures in the Overlay District, the City will be
26 severely limited in the service that it can receive. The
27 new Columia substation would have to be located elsewhere,
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idaho Power Company
1 outside of the Overlay District, and both it and the
2 existing Kuna substation will be limited to a less reliable
3 radial transmission service. Future large load industrial
4 and commercial cus tomers could not be served wi th the
5 existing infrastructure, and would require their own
6 special facilities to be constructed on a case-by-case
7 basis if located in the City's area of impact.
8 Q.Could Kuna' s Overlay District ordinance
9 impact Idaho Power's other customers?
10 A.Yes. if idaho Power is prohibited from
11 constructing any new poles or upgrading any existing poles
12 in the Overlay District it will result in increased cost,
13 and decreased reliability not only for the immediate
14 facilities and service to the Kuna area discussed above,
15 but also on a longer term and wider ranged transmission
16 system basis when transmission from the Hemmingway station
17 must be integrated and constructed.
18 Q.Does this conclude your direct testimony in
19 this case?
20 A.Yes, it does.
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