electric cost allocation for a new era: technical topics...electric cost allocation for a new era:...
TRANSCRIPT
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Jim Lazar, Senior Advisor Mark LeBel, Associate Paul Chernick, PresidentResource Insight, Inc.The Regulatory Assistance Project (RAP)®
Webinar
Electric Cost AllocationFor A New Era:Technical Topics
June 4, 2020
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Regulatory Assistance Project (RAP)®
Please send questions through the Questions pane
Questions?
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First webinar was on principles and concepts.
Available at www.raponline.org
This webinar is a little more technical.
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Regulatory Assistance Project (RAP)®
• Principles• Generation• Transmission• Distribution• Storage• Metering and Billing • Marginal Cost Studies
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Major Topics for Today
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Regulatory Assistance Project (RAP)®
Author
First Rate Case Dockets
Jim Lazar 1974 >100 Paul Chernick 1977 >350 Bill Marcus 1978 >300
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Collective experience: 43 states, 8 provinces
About the Authors
Mark LeBel, Editor
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Regulatory Assistance Project (RAP)®
1 Principles
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Regulatory Assistance Project (RAP)®
• Wind, solar and storage• Customer-sited generation• Energy efficiency• Demand response• Smart grid• Electric vehicles• Advanced metering
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What’s New In Cost Allocation?
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Regulatory Assistance Project (RAP)® 8
Basic Thesis:Costs are assignedto time periods
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Regulatory Assistance Project (RAP)®
2 Generation Costs
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Regulatory Assistance Project (RAP)® 10
Generation Methods(Electric Cost Allocation for a New Era, Table 19)
Method Computation and Data Intensity
Accuracy of Cost Causality
Straight fixed/variable Very low Very low
Simple base –intermediate – peak Low to medium Medium
Equivalent peaker Low High
Probability of dispatch Medium to high Highest
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Regulatory Assistance Project (RAP)® 11
Equivalent Peaker
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Regulatory Assistance Project (RAP)® 12
Base – Intermediate – Peak
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Regulatory Assistance Project (RAP)® 13
Hourly Allocation Methods:Probability of Dispatch
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Regulatory Assistance Project (RAP)® 14
Wind: Windy Hours
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Solar: Sunny Hours
Source: Southern California Public Power Agency
Source: US Energy Information Administration
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Regulatory Assistance Project (RAP)® 16
Class Load in Each Hour
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Regulatory Assistance Project (RAP)® 17
Generation in Each Hour
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Regulatory Assistance Project (RAP)® 18
Cost Allocation by Hours
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Regulatory Assistance Project (RAP)®
3 Transmission Costs
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Regulatory Assistance Project (RAP)® 20
Some Transmission Assets Connect Specific Resources
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Regulatory Assistance Project (RAP)® 21
Many Types of TransmissionElectric Cost Allocation for a New Era, Table 28
Element Demand/Energy Methods
Hourly Allocation
Bulk transmission
All energy / 100 highest hours
Hours used or needed
Remote generation
All energy / 100 highest hours
As remote generation
Economy interconnection
Energy and demand Reliability value + all hours
Local network High-load hours / 4CP or 12CP
Hours used or needed
Substations As lines As lines
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Regulatory Assistance Project (RAP)®
• Consider how transmission is used
• Do not be bound to FERC methods
• If storage is cheaper, avoid transmission
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Treating ISO and FERC-Priced Transmission
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Regulatory Assistance Project (RAP)®
4 Distribution Costs
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Regulatory Assistance Project (RAP)® 24
Distribution is Built to Supply Customer Needs
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Regulatory Assistance Project (RAP)®
• Shared distribution system expenses, such as primary conductors, poles and substations, do not meaningfully depend on the number of customers• A residential building can
be one hotel or 100 apartments.
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Minimum System Fallacy
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Regulatory Assistance Project (RAP)® 26
Substations Have Diversity
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Regulatory Assistance Project (RAP)® 27
Circuits Have Diversity
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Regulatory Assistance Project (RAP)® 28
Within an Apartment Building, Customers Have Diversity
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Regulatory Assistance Project (RAP)® 29
Distribution Cost Methods: Shared System ElementsElement Demand/Energy Method Hourly Allocation Method
Substations
Poles
Primary conductors
Functionalization: Entirely primaryClassification: Demand and energyDemand allocator: Hours at and near peaks
Allocate to all hours, with emphasis on high-load hours
Revenue-driven line extension costs allocated on a revenue basis
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Regulatory Assistance Project (RAP)® 30
Distribution Cost Methods: Site-Specific Elements
Element Method Hourly AllocationLine transformers
Secondary demand and energy
Transformer peaks and high-load hours
Secondaryconductors
Secondary demand and energy
Line peaks and high-load hours
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Regulatory Assistance Project (RAP)®
5 Storage
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Regulatory Assistance Project (RAP)® 32
Storage: Performs Many Functions
Source: Tesla
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Regulatory Assistance Project (RAP)® 33
Storage Functionalization
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Regulatory Assistance Project (RAP)®
• 363 Energy Storage Equipment – Distribution • 584 Underground Line Expenses (major only)• 584.1 Operation of Energy Storage Equipment • Why is “Operation of Energy Storage Equipment”
not in the power supply accounts 560-576?• Much storage is now owned by wind and solar
producers – in Account 555, Purchased Power
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Storage: Where the FERC System Of Accounts Is Weird
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Regulatory Assistance Project (RAP)®
6 Metering and Billing
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Regulatory Assistance Project (RAP)®
Traditional vs. AMI Metering
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Regulatory Assistance Project (RAP)®
• “Smart meters” do more than measure kWh• Enables new rate designs and demand
response programs• Enables volt/VAR optimization• Data improves system planning• Communications system has multiple uses
• City of Burbank: using AMI data, transformer right-sizing lowered line losses by 1%, saving$1 million per year
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Advanced Metering Costs
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Regulatory Assistance Project (RAP)® 38
Advanced Metering InfrastructureSmart Grid Element Legacy
AccountSmart Grid
Classification
Smart meters 370 Demand, energy and customer
Distribution control devices
362, 365, 367 Demand and energy
Data collection 902 Demand, energy and customer
Meter data management system
391, 903, 905
Demand, energy and customer
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Regulatory Assistance Project (RAP)®
7 Marginal Cost Studies
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Regulatory Assistance Project (RAP)®
• Short-run marginal cost• Long-run marginal cost• Hybrid mechanisms• Total Service Long-Run
Incremental Cost
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Marginal Cost
Alfred Kahn
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Regulatory Assistance Project (RAP)®
• Variable operating costs only• Relevant to system operation• Very little T&D short-run variable cost• Will not recover revenue requirement• Argued to be relevant to economic efficiency by
some economists41
Short-Run Marginal Cost
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Regulatory Assistance Project (RAP)®
• Long-run marginal cost of generation capacity• Short-run marginal cost of energy• Intermediate marginal cost for transmission• Long-run marginal cost for customer connections• Total service long-run marginal cost for billing and
collection• Inequitable if system is excess capacity or
deficient42
NERA Methodology: Often Applied With a Flawed Mix of Costs
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Regulatory Assistance Project (RAP)®
• Cost of a new system
• Serving today’s loads
• Optimally configured
• No excesscapacity
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Total Service Long-Run Incremental Cost
• Using today’s technologies• May be cheaper or more expensive than the existing system.
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Regulatory Assistance Project (RAP)®
• Need to consider long-run capital and operating costs to equitably treat renewables vs. fossil generation.
• Should use economic carrying charge rate, not utility cost of capital
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Marginal Generation Cost
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Regulatory Assistance Project (RAP)®
• NERA method: intermediate term for primary distribution, TSLRIC for customer connection
• Better alternatives:• TSLRIC for all components• New customer only
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Marginal Distribution Cost
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Regulatory Assistance Project (RAP)®
8 Summary
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Regulatory Assistance Project (RAP)®
• Assign costs to hours• Distinction between “demand-related” and “energy-
related” may be obsolete• Consider investment-related costs and operating costs
together, to avoid bias• Distribution costs are associated with service in
particular hours• Customer-specific costs are very limited• Marginal cost studies must use consistent time
periods for analysis47
Summary
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Regulatory Assistance Project (RAP)®
“Allocation of costs is not a matter for the slide rule. It involves judgment of a myriad of facts. It has no claim to an exact science.”
Colorado Interstate Gas Co. v. Federal Power Commission, 324 US 581, 589 (1945)
Justice William O. Douglas, U.S. Supreme Court
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About RAPThe Regulatory Assistance Project (RAP)® is an independent, non-partisan, non-governmental organization dedicated to accelerating the transition to a clean, reliable, and efficient energy future.
Learn more about our work at raponline.org
Contact us at:[email protected]@raponline.org