20211220IRP Exhibit 6.pdf

Intermountain Gas Company
Capacity Enhancement Alternatives NPV by AOI
Integrated Resource Plan 2021 – 2026

Exhibit No. 6
Intermountain Gas Company
Canyon County AOI
Net Present Value
Alternative #1 2 3 4
Alternative Description Ustick Phase II Ustick Phase III Ustick Uprate 8 inch HP extension north
($3,255,074.59)($8,613,402.92)($1,300,000.00)($6,551,492.43)
(3,190,000)$ (8,480,000)$ (1,300,000)$ (6,340,000)$
(5,185)$ (10,630)$ -$ (16,853)$
(5,289)$ (10,843)$ -$ (17,190)$
(5,395)$ (11,060)$ -$ (17,533)$
(5,503)$ (11,281)$ -$ (17,884)$
(5,613)$ (11,506)$ -$ (18,242)$
(5,725)$ (11,737)$ -$ (18,607)$
(5,840)$ (11,971)$ -$ (18,979)$
(5,956)$ (12,211)$ -$ (19,358)$
(6,076)$ (12,455)$ -$ (19,746)$
(6,197)$ (12,704)$ -$ (20,140)$
(6,321)$ (12,958)$ -$ (20,543)$
(6,447)$ (13,217)$ -$ (20,954)$
(6,576)$ (13,482)$ -$ (21,373)$
(6,708)$ (13,751)$ -$ (21,801)$
(6,842)$ (14,026)$ -$ (22,237)$
(6,979)$ (14,307)$ -$ (22,681)$
(7,118)$ (14,593)$ -$ (23,135)$
(7,261)$ (14,885)$ -$ (23,598)$
(7,406)$ (15,182)$ -$ (24,070)$
(7,554)$ (15,486)$ -$ (24,551)$
1
Intermountain Gas Company
State Street AOI
Net Present Value
Alternative #1 2
Alternative Description
State Street Phase II
Net Present Value ($2,030,591.75)($5,536,656.65)
Year 0 (2,000,000)$ (5,400,000)$
Year 1 (2,438)$ (10,889)$
Year 2 (2,486)$ (11,107)$
Year 3 (2,536)$ (11,329)$
Year 4 (2,587)$ (11,556)$
Year 5 (2,639)$ (11,787)$
Year 6 (2,691)$ (12,023)$
Year 7 (2,745)$ (12,263)$
Year 8 (2,800)$ (12,509)$
Year 9 (2,856)$ (12,759)$
Year 10 (2,913)$ (13,014)$
Year 11 (2,972)$ (13,274)$
Year 12 (3,031)$ (13,540)$
Year 13 (3,092)$ (13,810)$
Year 14 (3,153)$ (14,087)$
Year 15 (3,216)$ (14,368)$
Year 16 (3,281)$ (14,656)$
Year 17 (3,346)$ (14,949)$
Year 18 (3,413)$ (15,248)$
Year 19 (3,482)$ (15,553)$
Year 20 (3,551)$ (15,864)$
2
Intermountain Gas Company
Ada County AOI
Net Present Value
Alternative #1 2 3
Alternative Description 12 inch South Boise Loop
Uprate 10 inch HP on Compressor Station at
Net Present Value ($10,321,364.12)($2,034,763.35)($12,807,602.46)
Year 0 (10,200,000)$ (2,000,000)$ (12,000,000)$
Year 1 (9,671)$ (2,770)$ (64,353)$
Year 2 (9,864)$ (2,825)$ (65,640)$
Year 3 (10,062)$ (2,882)$ (66,953)$
Year 4 (10,263)$ (2,940)$ (68,292)$
Year 5 (10,468)$ (2,998)$ (69,658)$
Year 6 (10,677)$ (3,058)$ (71,051)$
Year 7 (10,891)$ (3,120)$ (72,472)$
Year 8 (11,109)$ (3,182)$ (73,922)$
Year 9 (11,331)$ (3,246)$ (75,400)$
Year 10 (11,558)$ (3,311)$ (76,908)$
Year 11 (11,789)$ (3,377)$ (78,446)$
Year 12 (12,024)$ (3,444)$ (80,015)$
Year 13 (12,265)$ (3,513)$ (81,616)$
Year 14 (12,510)$ (3,583)$ (83,248)$
Year 15 (12,760)$ (3,655)$ (84,913)$
Year 16 (13,016)$ (3,728)$ (86,611)$
Year 17 (13,276)$ (3,803)$ (88,343)$
Year 18 (13,541)$ (3,879)$ (90,110)$
Year 19 (13,812)$ (3,956)$ (91,912)$
Year 20 (14,089)$ (4,036)$ (93,751)$
3
Intermountain Gas Company
Sun Valley Lateral AOI
Net Present Value
Alternative #1
Alternative Description
Shoshone Compressor
Net Present Value ($5,807,602.46)
Year 0 (5,000,000)$
Year 1 (64,353)$
Year 2 (65,640)$
Year 3 (66,953)$
Year 4 (68,292)$
Year 5 (69,658)$
Year 6 (71,051)$
Year 7 (72,472)$
Year 8 (73,922)$
Year 9 (75,400)$
Year 10 (76,908)$
Year 11 (78,446)$
Year 12 (80,015)$
Year 13 (81,616)$
Year 14 (83,248)$
Year 15 (84,913)$
Year 16 (86,611)$
Year 17 (88,343)$
Year 18 (90,110)$
Year 19 (91,912)$
Year 20 (93,751)$
4
Intermountain Gas Company
Idaho Falls Lateral AOI
Net Present Value
Alternative #1 2
Alternative Description
Blackfoot Compressor Phase VI with a second
Net Present Value ($15,807,602.46)($23,246,006.08)
Year 0 (15,000,000)$ (23,100,000)$
Year 1 (64,353)$ (11,634)$
Year 2 (65,640)$ (11,867)$
Year 3 (66,953)$ (12,104)$
Year 4 (68,292)$ (12,347)$
Year 5 (69,658)$ (12,593)$
Year 6 (71,051)$ (12,845)$
Year 7 (72,472)$ (13,102)$
Year 8 (73,922)$ (13,364)$
Year 9 (75,400)$ (13,632)$
Year 10 (76,908)$ (13,904)$
Year 11 (78,446)$ (14,182)$
Year 12 (80,015)$ (14,466)$
Year 13 (81,616)$ (14,755)$
Year 14 (83,248)$ (15,050)$
Year 15 (84,913)$ (15,351)$
Year 16 (86,611)$ (15,658)$
Year 17 (88,343)$ (15,972)$
Year 18 (90,110)$ (16,291)$
Year 19 (91,912)$ (16,617)$
Year 20 (93,751)$ (16,949)$
5