PC16 NW Pump Storage Study Results

Stan Holland

December 20, 2016

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PC16 NW Pump Storage Modeling2

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Scope

• Scope• Key Questions

Assumptions

Add 1200 MW of Pump Storage in

NW

Results• Generation Dispatch• CO2 Emissions• Production Cost• Dump Energy• Path Flows

Production Cost Model

NW Pump Storage

Purpose

To study the effect of adding 1200 MW of pump storage in the northwest in a high renewable environment.

The case used a modified version of the original PC23 case (High RE in the NW and No. Calif.), under normal hydro conditions. Comparisons are made to that case.

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PC16 Scope

• Study Requestor: National Grid

• PC23b study changes from 2026 CC

– Renewable generation added in NW and No. Calif.

• PC16 study changes from PC23b

– 1200 MW (4 x 300 MW) pump storage added in northwest at the WAUTOMA 500 kV bus

• Key Questions

– How does the system respond to added pump storage?• Generation dispatch

• Transmission utilization

• Loads served & production cost

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Dispatch of Added Pump Storage5

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Pumping Dispatch of Added PS6

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Comparison of Generation Results

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WECC Annual Generation by Category (MWh)

Category2026 PC23b High

NW RE

2026 PC16 NW

Pump StorageDifference

Conventional Hydro 240,637,586 240,624,392 (13,194)

Energy Storage 2,807,851 3,274,730 466,879

Steam - Coal 169,234,094 169,516,213 282,120

Steam - Other 1,759,024 1,754,307 (4,717)

Nuclear 37,688,019 38,340,524 652,505

Combined Cycle 244,398,634 243,556,321 (842,312)

Combustion Turbine 36,271,570 36,161,126 (110,445)

IC 679,439 674,753 (4,686)

Other 0 0 0

DG/DR/EE - Incremental 30,439,080 30,439,228 147

Biomass RPS 21,049,343 21,042,650 (6,693)

Geothermal 32,359,521 32,360,647 1,126

Small Hydro RPS 3,743,933 3,744,013 80

Solar 57,514,554 57,578,959 64,405

Wind 123,417,654 123,520,577 102,923

== Total == 1,002,000,301 1,002,588,440 588,139

Other Results

Var. Prod. Cost (M$) 15,593 15,573 (20)

CO2 Cost (M$) 2,163 2,169 5

CO2 Amount (MMetrTn) 286 286 (0)

Dump Energy (MWh) 10,978,423 11,038,617 60,194

Pumping (PL+PS) (MWh) 11,664,226 12,238,728 574,501

Exports (MWh) 0 0 0

Added PC16 units

Columbia GS

Cost and CO2 impacts are difficult to interpret with dispatch changes

Why did Nuclear generation increase?9

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There were 4 more forced outages in the PC23b case than in the PC16 case. This is set by the GridView monte carlo results.

Change in Generation by state10

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Path Utilization11

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Summary Observations

• The added pump storage units were dispatched more from February through June.

• There was very little impact to the flows on theWECC paths.

• The other impacts on costs and CO2 are unclear due to the other unrelated dispatch changes.

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Contact Info

Stan Hollandstan@wecc.biz(801) 883-6858

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