long-term planning and integration of renewables at a...

Long-Term Planning and Integration of

Renewables at a Mid-Sized Utility

LEE ALTERSR . SUPPLY S I DE PLANNER

TUCSON ELEC TRI C POWER

Presentation Overview

• About TEP and its renewable energy goal

• System balancing requirements

• System balancing resources

• Other long-term renewable integration strategies• Energy storage

• Sub-hourly markets

• Sub-hourly analytic capabilities

• University/industry partnerships

• Corporate and public awareness

About TEP

• Third largest utility in Ariaona, after APS and SRP

• Peak demand of 2,300 MW

• Vertically integrated

• 420,000 customers

• 1% annual growth

• State EE standard of 22% by 2020

• State RE standard of 15% by 2025

• Corporate RE goal of 30% by 2030

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Retail Sales

2017 Integrated Resource Plan

Portfolio Energy Mix

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2017 2032

TEP

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2017 Integrated Resource Plan

Timeline

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CAISO Typical Spring Day(I just couldn’t resist)

Average 10-min ramp = 1.6% of system peak(29% of 2016 retail sales served by renewables)

2016 Renewable Energy Mix

TEP’s Duck Curve(Average of March 2024)

8Average 10-min ramp during HE 17 = 1.2% of system peak

(20% of 2024 retail sales served by renewables)

2024 Renewable Energy Mix

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Kingman

Red Horse Wind

Macho Springs

Rio RicoFt. Huachuca

Gato Montes Tech Park

Distributed Gen

Avalon IE.On Tech Park

Red Horse Solar

Avra Valley

Sites Used in Analysis:• 3 wind• 5 single-axis tracking• 3 fixed-tilt• 1 DG

Black Mountain

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Base Case

GeographicallyDispersed Case

GeographicallyConcentrated Case

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Allocation of Renewable Energy Capacity (2024)

2017 RE Capacity: 450 MW2024 RE Capacity: 920 MW

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TEP Ramping Requirements Under Alternative Siting Scenarios for Future Renewable Energyand Their Comparison to TEP Ramping Resources Under Optimal Conditions (2024)

200 MW / 10 min =7.7% of system peak

Energy Storage:

Batteries

• In 2017, TEP commissioned two 10 MW x 2.5 MWh Li-ion batteries, primarily for frequency response and voltage support

• In 2019/2020, TEP will commission a solar-tied 30 MW x 120 MWh Li-ion battery

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Reciprocating Internal Combustion Engines

• TEP is procuringten 20 MW units

• Replacing twoold, gas-firedsteam units

• Improve reliability

• Integrate renewables

• Efficiently meet local min gen requirements

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2017 Hourly and Daily Gas Requirements

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2024 Hourly and Daily Gas Requirements

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Energy Storage:

Natural Gas Storage

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Energy Storage:

Pumped Hydro

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EIM / RTO Membership

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Enhanced Dispatch Cost Modeling:

Why and How

• To assess renewable integration strategies• Fast response generators, storage options, market

options, etc.

• Need to configure Aurora for sub-hourly modeling• Renewable energy generation, market prices, resource

parameters, etc.

• Need to improve post-processing capabilities

• Need a deep bench to do it right and to get buy-in

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Enhanced Dispatch Cost Modeling:

Preliminary Analysis at TEP

• Purpose• See how the model works at high time resolutions• Gauge the effort involved• Explore potential applications

• Case study• 1-hour vs 1-minute modeling of July 2024• 200 MW of RICEs versus 200 MW of batteries• Aurora version 12.3.1048• Commitment optimization• DemandNetMR for batteries• Renewable generation profile based on 1-minute actuals

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University of Arizona Tech Park

• 1300 acre campus

• 2M sqft of high-tech offices and laboratories

• Provides an interactive ground to connect university, community, and industry in the pursuit of technology innovation

• Commercializes invention stemming from university research

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University of Arizona Tech Park

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Tech Park Solar Zone

• One of the largest multi-tech solar demo sites in US

• Partnership between University of AZ and TEP

• Side-by-side testing of new technologies, plus:• Forecasting• Generation and distribution• Assembly and manufacturing• Product development• Testing and evaluation• Workforce training• Environmental impact evaluation• Public education and demonstration

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Tech Park Solar Zone

• Phase I• Recently completed

• Focused primarily on generation and distribution

• Each solar tenant has a 20-year PPA with TEP

• Phase II• In progress

• Focused on energy storage, grid optimization, micro grids, distributed systems, and integrated and embedded solar materials

• Includes plans for a solar education and visitor center

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Tech Park Solar Zone

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