20231025Staff 1-6 to IPC.pdf

ADAM TRIPLETT
DEPUTY ATTORNEY GENERAL
IDAHO PUBLIC UTILITIES COMMISSION 25 1 9:4 i
PO BOX 83720
BOISE,IDAHO 83720-0074 MISSION
[phone]
IDAHO BAR NO.10221
Street Address for Express Mail:
11331 W CHINDEN BLVD,BLDG 8,SUITE 201-A
BOISE,ID 83714
Attorney for the Commission Staff
BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION
IN THE MATTER OF IDAHO POWER )COMPANY'S ANNUAL COMPLIANCE )CASE NO.IPC-E-23-25
FILING TO UPDATE THE LOAD AND GAS )FORECASTS IN THE INCREMENTAL COST )INTEGRATED RESOURCE PLAN AVOIDED )FIRST PRODUCTION
COST MODEL.)REQUESTOF THE
)COMMISSION STAFF
)TO IDAHO POWER COMPANY
Staff of the Idaho Public Utilities Commission,by and throughits attorney of record,
Adam Triplett,Deputy AttorneyGeneral,requests that Idaho Power Company ("Company")
provide the followingdocuments and information as soon as possible,but no later than
WEDNESDAY,NOVEMBER 15,2023.
This Production Request is to be considered as continuing,and the Company is requested
to provide,by way of supplementary responses,additional documents that it,or any person
acting on its behalf,may later obtain that will augment the documents or information produced.
Please provide answers to each question,supporting workpapers that provide detail or are
the source of information used in calculations,and the name,job title,and telephonenumber of
the person preparing the documents.Please also identify the name,job title,location,and
telephone number of the record holder.
FIRST PRODUCTION REQUEST
TO IDAHO POWER COMPANY 1 OCTOBER 25,2023
In addition to the written copies provided as response to the requests,please provide all
Excel spreadsheets and electronic files with formulas intact and enabled.
REQUESTNO.1:Page 3 of the Application states that the 2023 load forecast shows a
4.86 percent average reduction over the 20-year term compared with the 2022 load forecast
proposed in Case No.IPC-E-22-26.The Company continues to state:
The decrease -which amounts to an approximately 4.86 percent average
reduction over the 20-year term -is based on new assumptions surrounding the
Company's expected energy service agreements that offer different ramp
schedules and total peak requirements relative to October 2022.In addition,there
has been a rebalancing of commercial,industrial,and irrigation load that slightly
brought down expectations of future load levels,though the growth pattern is
similar.These reductions are slightly offset by an increase in expectations for the
residential class.
Please respond to the following:
a.Please explain how the 4.86 percent reduction is calculated and provide
the workpaper that calculates it;
b.Please identify and explain the "new assumptions";
c.Please list all the "expected energy service agreements";
d.Please provide a detailed explanation on how the "ramp schedules and
total peak requirements"of September 2023 are different than that of
October 2022;and
e.Please explain what "rebalancing"means and why such rebalancing can
reduce expectations of future load levels.
REQUESTNO.2:Please provide Henry Hub Annuals from S&P Global Platt's
Long-term Forecast without adjustment for Sumas basis and transport costs for Idaho
City Gate delivery for the forecast proposed in this case and for the forecast proposed in
Case No.IPC-E-22-26.Also,please explain what causes the difference between the two
forecasts.
REQUESTNO.3:Please respond to the followingregarding the proposed natural
gas forecast.
FIRST PRODUCTION REQUEST
TO IDAHO POWER COMPANY 2 OCTOBER 25,2023
a.Please explain how the Company adjusts HenryHub Annuals for Sumas
basis and why Sumas basis annuals are not determined independently of
Henry Hub Annuals;
b.Please provide Henry Hub Annuals from S&P Global Platt's Long-term
Forecast adjusted for Sumas basis but without adjustment for transport
costs for Idaho City Gate delivery for the forecast that is proposed in this
case.Please also provide the same informationproposed in Case No.IPC-
E-22-26;
c.Please explain what causes the difference between the two forecasts used
in the two cases;
d.Comparing the 2022 forecast and the 2023 forecast,is the trend of Henry
Hub annuals consistent with the trend of Sumas basis annuals?If not,
please explain why not;and
e.Please explain how transport costs for Idaho City Gate deliveryare
determined.
REQUESTNO.4:"Table 2:2024 Forecast Average Load"of the Application shows
the proposed peak hours in 2024.Please provide a detailed explanation for how the
highlightedpeak hours are identifed.
FIRST PRODUCTION REQUEST
TO IDAHO POWER COMPANY 3 OCTOBER 25,2023
Table 2:2024 Forecast Average Load
2024 Forecast Average Load
Hour Hour
Beginning Ending
(MFT)(MPT)San Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
midnight 1 1709 1587 1481 1329 1643 1939 2248 2073 1668 1312 1577 1859
1 1686 1561 1454 1276 1582 1837 2089 1964 1608 1259 1556 1838
2 3 1685 1564 1449 1262 1552 1725 1988 1895 1574 1236 1552 1831
3 4 1697 1581 1464 1276 1540 1669 1914 1848 1558 1235 1561 1838
4 5 1742 1636 1506 1333 1554 1643 4 iŠi 1567 1263 1595 1866
5 6 1840 1760 1607 1479 1620 1676 1896 1868 1622 1359 1675 1927
6 7 1999 1963 1777 1746 1744 1756 19T2 1964 1743 1534 1805 2028
7 8 2130 2117 1914 1932 1850 1910 2123 2060 1846 1689 1907 2111
8 9 2166 2133 1937 1963 1905 205&2287 2165 1900 1751 1933 2143
9 10 2145 2090 1908 1940 1932 2159 2420 2258 1940 1773 1922 2142
10 11 2102 2031 1855 1897 1945 22 2540 2345 1967 1766 1888 212G
11 12 2048 1963 1797 1842 1953 2338 2655 2427 1987 1750 1848 2097
noon 13 1989 1893 1739 1788 1953 2412 2771 2513 2002 1731 1809 2064
J 14 1941 1840 1693 1742 1957 2489 -2612 2034 1728 1777 2037
2 15 1910 1797 1654 1708 1964 2562 2717 2070 1732 1755 2022
3 16 1904 1778 1629 1680 1969 2621 2104 1746 1749 2023
4 17 1950 1807 1633 1687 1986 2670 2148 1775 1783 2064
5 18 2067 1880 1659 1712 2004 270E 2175 1803 1873 2153
6 19 2141 2004 1700 1735 2016 2725 2175 1816 1912 2170
7 20 2107 2027 1748i 1743 2017 2709 2148 1851 1894 2144
8 21 2063 1992 1789Í 1818 2006 2639 2778 1134 1810 1862 2117
9 22 1980 1908 17d1I 1809 2001 2539 2671 2043 1705 1801 2067
10 23 1858 1777 1636|1636 1894 2382 2802 2466 1897 1556 1716 1987
11 24 752 W9]3447 1744 2138 2511 2242 1756 1413 1637 1911
REQUESTNO.5:Table 3 of the Application shows "2023 Actual Load,Net of
Solar."Please confirm that the purpose of Table 3 is to support the reasonableness of the
proposed peak hours,because the red-circles fall within the proposed peak hours.Also,
please explain how the locations and the sizes of the circles are determined.
FIRST PRODUCTION REQUEST
TO IDAHO POWER COMPANY 4 OCTOBER 25,2023
Table 3:2023 Actual Load,Net of Solar
2023 Load-Net-SolarGeneration
Red circle represorts hours in 2023 when load Det if solar was highest,a uthm the ydlowNghlightedhiglestdorecasted-loadblock (from 2024 loadforeent)
Hour Beginning Ending September
(MPT](MPT)January February March Aoril May June luiv August (thm15th)October November Dicember
midnight 1 2074 2023 1734 1628 1999 2278 2609 2445 1851
1 2 2070 1967 1735 1601 1912 2138 2433 2315 1804
2 3 2074 1972 1741 1605 1826 2038 2326 2193 1760
3 4 2093 1993 1779 1620 1773 1968 2231 2108 1721
4 5 2153 2039 1834 1664 1749 1927 2182 2077 1722
5 6 2247 2145 1935 1777 1769 1953 2207 2083 1772
6 7 2398 230fi 2109 1960 1861 1994 2294 2169 1881
7 8 2518 2429 2199 2059 1873 1970 2392 2205 1930
8 9 2492 2390 2137 2013 1831 1974 2457 2264 1917
9 10 2355 2194 1990 1871 1766 1989 2506 2355 1872
10 11 2287 2132 1924 1726 1713 2055 2601 2386 1891
11 12 2255 2050 1836 1641 1733 2187 2628 2402 1881
noon 13 2166 1971 1799 1582 1830 2325 2721 2582 1885
1 14 2144 1963 1908 2458 2922 2787(1921\
2 15 2154 1866 1764 1542 2013 2572 3074 3023 1969
3 16 2180 1848 1799 1534 2187 2661 3122 313(2108
4 17 2236 1956 1855 1677 2286 2745 3158 3055|2210
5 18 2345 2092 1941 1839 2388 2823 fŠ 3054 2311
6 19 2395 2Z28 2040 1988 2458 2867|3226 $14A 2419
7 20 2364 2214 2060 2096 2480 2908 3310 3281 y 2538
8 11 2353 2199 20341 2103 2507 3063 3422 33Ò8 2445
9 22 2273 2139 1965 2040 2430 3008 329)3176 22B2
10 23 2184 2043 1857 1874 2301 2824 3071 2910 2072
N 2103 1946 1778 1710 2127 2598 2830 2660 1952
REQUESTNO.6:Table 4 shows the 2023 Average of Western Energy
Imbalance Market Locational Marginal Prices.Please confirm that the purpose of Table
4 is to support the reasonableness of the proposed peak hours,because the red-circles fall
within the proposed peak hours.Also,please explain how the locations and the sizes of
the circles are determined.
DATED at Boise,Idaho,this 2 day of October 2023.
Adam Triplett
Deputy AttorneyGeneral C/
Technical Staff:Yao Yin
Kevin Keyt
i:umisc:prodreq/IPC-E-23-25 PR#1
FIRST PRODUCTION REQUEST
TO IDAHO POWER COMPANY 5 OCTOBER 25,2023
CERTIFICATE OF SERVICE
I HEREBY CERTIFY THAT I HAVE THIS 25th DAY OF OCTOBER 2023,
SERVED THE FOREGOING FIRST PRODUCTION REQUESTOF THE
COMMISSION STAFF TO IDAHO POWER COMPANY,IN CASE NO.IPC-E-23-25,
BY E-MAILING A COPY THEREOF,TO THE FOLLOWING:
MEGAN GOICOECHEA ALLEN
DONOVAN E WALKER
IDAHO POWER COMPANY
PO BOX 70
BOISE ID 83707-0070
E-MAIL:[e-mail]
[e-mail]
[e-mail]
SECRETARY
CERTIFICATE OF SERVICE