confidential per protective order in docket ue-191024 exh ...€¦ · my testimony presents the...

Confidential per Protective Order in Docket UE-191024 Exh. MGW-4CT

Dockets UE-191024 et. al. Witness: Michael G. Wilding

BEFORE THE WASHINGTON UTILITIES AND TRANSPORTATION COMMISSION

WASHINGTON UTILITIES AND TRANSPORTATION COMMISSION,

Complainant,

v. PACIFICORP dba PACIFIC POWER & LIGHT COMPANY

Respondent.

Dockets UE-191024, UE-190750, UE-190929, UE-190981, UE-180778 (Consolidated)

PACIFICORP

REDACTED SUPPLEMENTAL TESTIMONY OF MICHAEL G. WILDING

April 2020

Supplemental Testimony of Michael G. Wilding Exhibit No. MGW-4CT Page i

ATTACHED EXHIBITS

Exhibit No. MGW-5—Washington-Allocated Net Power Costs

Exhibit No. MGW-6—Net Power Costs Update

Supplemental Testimony of Michael G. Wilding Exhibit No. MGW-4CT Page 1

Q. Are you the same Michael G. Wilding who previously submitted direct testimony 1

in this proceeding on behalf of PacifiCorp dba Pacific Power & Light Company 2

(PacifiCorp or the Company)? 3

A. Yes. 4

PURPOSE AND SUMMARY OF TESTIMONY 5

Q. What is the purpose of your supplemental testimony? 6

A. My testimony presents the Company’s update to net power costs (NPC) 7

(April update), as requested in PacifiCorp’s Motion to Allow Supplemental 8

Testimony. In the April update, I explain the reasonableness of the Company’s 9

revised NPC allocated to Washington customers based upon the Washington Inter-10

Jurisdictional Allocation Methodology (WIJAM).1 I provide corrections and contract, 11

fuel, and forward prices curve updates to the Company’s December 13, 2019 filing 12

(initial filing), which was based on the September 30, 2019 Official Forward Price 13

Curve (OFPC). 14

Q. In the initial filing, the Company forecast NPC of $106.5 million for the rate 15

effective period ending December 31, 2021. How has your NPC recommendation 16

changed? 17

A. The Washington-allocated NPC in the April update is $112.2 million before applying 18

the production factor, $5.7 million higher than the NPC in the initial filing. A report 19

detailing the Washington-allocated NPC forecast is attached to my testimony as 20

Exhibit MGW-5. A list of all corrections and updates made, along with the 21

1 Unless otherwise specified, references to NPC throughout my testimony are expressed on a Washington-allocated basis.


approximate impact of each on NPC, is provided in Exhibit MGW-6. 1

SUPPLEMENTAL UPDATE 2

Q. Please summarize the major changes in NPC resulting from the April update. 3

A. Figure 1 illustrates the change in the forecast NPC by category compared to the NPC 4

originally filed in this case. 5

Figure 1

The changes in the components of Washington-allocated NPC from the initial 6

filing are largely driven by an increase in the forward market prices for electricity and 7

natural gas. Lower wholesales revenue, higher purchase power expense, and higher 8

natural gas fuel expense resulted in higher Washington-allocated NPC. This increase 9

is partially offset by lower coal fuel expense and wheeling expenses. 10

Q. Please explain the changes included in the Company’s April update. 11

A. The April update includes the following changes (the NPC impacts are based on the 12

initial filing): 13

• Klamath River Hydroelectric Facilities—The Company expects to continue to 14

Washington Allocated($ millions)

2021 Rate Case (WA) $106.5

Increase/(Decrease) to NPC:Wholesale Sales Revenue $0.8Purchased Power Expense $5.4Coal Fuel Expense ($1.0)Natural Gas Fuel Expense $0.9Wheeling and Other Expense ($0.4)

Total Increase/(Decrease) to NPC $5.7

2021 Rate Case April Update (WA) $112.2

Net Power Cost Reconciliation


operate Klamath River Hydroelectric Facilities during the 2021 NPC forecast period 1

(rate effective period). This update decreases Washington-allocated NPC by 2

approximately $1.6 million. 3

• Cholla Unit 4 Retirement—On January 7, 2020, the Company announced plans to 4

close the Cholla Unit 4 coal-fired power plant in northern Arizona by the end of 2020. 5

Cholla Unit 4 coal-fired power plant is removed from the Company’s resource 6

portfolio in the total-company NPC study.2 This update increased NPC by 7

approximately $0.8 million on a Washington-allocated basis. 8

• Energy Imbalance Market (EIM) Inter-Regional Transfer Benefits and 9

Greenhouse Gas (GHG) Benefits—PacifiCorp’s estimated EIM benefits for 2021 10

have been updated to include the most recent information through December 2019. 11

On a total-company basis, the expected inter-regional transfer benefits are 12

million, an increase of million; the GHG benefits are forecasted at 13

million, an increase of million. This update reduced the Washington-14

allocated NPC by approximately $1.1 million. 15

• Coal Costs—The Company has updated coal fuel costs to reflect changes in prices 16

and volumes since the initial filing. Mr. Dana M. Ralston provides additional detail 17

on the update in his supplemental testimony. The update decreased NPC by 18

approximately $1.0 million on a Washington-allocated basis. 19

• Wheeling Expense—The Company inadvertently included a wheeling expense item 20

in the rate effective period, which was supposed to be a one-time charge in 2019. 21

2 While Cholla Unit 4 is not included in Washington rates, the removal of any resource impacts total-system dispatch and net power costs.

REDACTED


Removing this wheeling expense item reduced Washington-allocated NPC by $0.4 1

million. 2

• Official Forward Price Curve (OFPC) and Short-Term Firm Transactions—The 3

Company updated NPC from the September 30, 2019 OFPC, to the December 31, 4

2019 OFPC. On average, market prices for electricity at the Mid-Columbia (Mid-C) 5

and Four Corners (4C) markets increased by approximately eight percent. Similarly, 6

market prices for natural gas increased, on average, by approximately eleven percent. 7

Short-term sales and purchase transactions for electricity and natural gas were also 8

updated through March 1, 2020. These updates increased the Washington-allocated 9

NPC by approximately $2.4 million. 10

Figure 2 shows the change in wholesale electricity prices (average market 11

price at the Mid-C and 4C trading hubs) by month and by heavy load hours (HLH) 12

and light load hours (LLH). Figure 3 shows the change in natural gas prices on 13

average at the Sumas and Stanfield trading hubs by month, which is a source of gas 14

for the Company’s gas plants. 15


Figure 2

Figure 3


• Long-Term Contract, Owned Wind Resources Status, and Pipeline Expense 1

Changes—The Company has included six long-term contract updates, two owned-2

wind resource status updates and one gas pipeline expense update. These updates 3

resulted in a $0.2 million increase to the Washington-allocated NPC. 4

Long-Term Contract Status Changes: 5

o Monsanto/Bayer and US Magnesium Buy-through—The Company 6

inadvertently used the actual buy-through amount from the period of July 7

2018 to June 2019 for the rate effective period. The correction was made 8

to use the historical average from the period July 2015 to June 2019 (US 9

Magnesium) and July 2014 to June 2019 (Monsanto) respectively for both 10

contracts. 11

o Millican Solar and Prineville Solar Capacity—Millican Solar project 12

capacity changed from 45 megawatts (MW) to 60 MW. Prineville Solar 13

project capacity changed from 55 MW to 40 MW. 14

o Cove Mountain Solar II—The Cove Mountain Solar II contract expense 15

was corrected and the delivered energy schedule was updated to the 16

calendar year 2021 forecast. 17

o Sigurd Solar Commercial Operational Date (COD)—The COD of 18

Sigurd Solar, an 80-MW solar plant in Sevier County, Utah has been 19

postponed to June 30, 2021, due to the recent disruption of the global 20

supply chain. 21


Owned-Wind Resources Status Changes: 1

The capacity factors for Foote Creek I and TB Flats II were corrected from the 2

initial filing. The generation from Foote Creek I and TB Flats II in the rate 3

effective period increased by 4,887 megawatt-hours (MWh) on a Washington-4

allocated basis, which is 6.5 percent higher than the initial filing. 5

Gas Pipeline Expense Changes: 6

Transportation costs to supply natural gas to the Naughton 3 plant are updated 7

to reflect a new gas supply and transportation agreements for the plant. 8

• Transmission Links—The Company updated transmission links from the initial 9

filing. This reduced NPC by approximately $2.3 million on a Washington-allocated 10

basis. 11

• Grant Meaningful Priority Hydro—The Grant Meaningful Priority hydro contract 12

was inadvertently included in the rate effective period in the initial filing. Removal of 13

this contract increased the Washington-allocated NPC by approximately $2.8 million. 14

• Colstrip 4 Outage—As a result of the Commission order in the Colstrip Outage 15

Investigation,3 the Company has removed certain Colstrip Unit 4 forced outages from 16

the 48-month history of actual outage events. The forced outages removed are related 17

to non-compliance with Mercury and Air Toxics Standards emissions limits during 18

summer 2018. The historical outage events are used to calculate the forecasted 19

outage rate in the rate effective period. The forecasted forced outage rate for Colstrip 20

3 In the Matter of the Investigation of Avista Corporation, d/b/a Avista Utilities, Puget Sound Energy, and Pacific Power & Light Company, Regarding Prudency of Outage and Replacement Power Costs, Docket No. UE-190882, Final Order 05 (Mar. 20, 2020).


Unit 4 was reduced from 10.19 percent to 7.56 percent and the forecasted NPC is 1

lowered by approximately $43,000 on a Washington-allocated basis. 2

Q. Does this conclude your supplemental testimony? 3

A. Yes. 4

Exh. MGW-5 Dockets UE-191024 et. al.

Witness: Michael G. Wilding



Complainant,


Respondent.


PACIFICORP

EXHIBIT OF MICHAEL G. WILDING

Washington-Allocated Net Power Costs

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Exhibit MGW-5 Page 1 of 4

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Exh. MGW-6 Dockets UE-191024 et. al.

Witness: Michael G. Wilding



Complainant,


Respondent.


PACIFICORP

EXHIBIT OF MICHAEL G. WILDING

Net Power Costs Update

April 2020

2021 Rate Case (WA) NPC ($) = 106,503,513

Impact ($)

Washington

Allocated Basis

Updates

U01 ‐ Klamath Hydro (1,628,043)

U02 ‐ Cholla 4 Retirement 781,179

U03 ‐ EIM Benefits (1,092,549)

U04 ‐ Coal Fuel Expense 1,309,458

U05 ‐ Wheeling (429,296)

U06 ‐ Official Forward Price Curve (1912) 2,369,458

U07 ‐ Long Term Contracts and Resources 204,660

U08 ‐ Transmission Links (2,264,491)

U09 ‐ Grant Meaningful Hydro Contract 2,761,828

Commission Order

U10 ‐ Colstrip 4 Outage (42,882)

Total Change from Initial Filing ($)= 5,656,963

2021 Rate Case April Update (WA) NPC ($) = 112,160,477


confidential per protective order in docket ue-191024 exh ...€¦ · my testimony presents the...

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