Scaling  Up  and  Crossing  Bounds

In this study, Lumen continues the CPUC’s examination of energy storage growth, performance in electricity markets, use cases, and policy pathways to unlock full value from this flexible and modular resource. As the state’s energy storage fleet scales up, this report demonstrates real-world implications for energy, ancillary services, and resource adequacy markets and identifies policy adjustments that may be needed. And, as energy storage continues to cross traditional industry boundaries in planning, procurements, and operations, this report provides additional guidance towards beneficial multiple use applications that provide services both to (a) customers or the local distribution system, and (b) the bulk (wholesale) grid.

​Scaling Up and Crossing Bounds: Energy Storage in California
​​May 1, 2024

CPUC  Energy  Storage  Procurement  Study

Lumen conducted the California Public Utilities Commission's inaugural evaluation of energy storage policies and market development. The final study report includes a comprehensive assessment of the CPUC's stationary energy storage procurement framework, its impact on the evolution of California’s energy storage market, and the resulting net benefits. The report concludes with a set of policy recommendations to the CPUC that aim to secure and strengthen future net benefits of the state’s rapidly-growing energy storage portfolio.​​

CPUC Energy Storage Procurement Study Final Report
May 31, 2023

​Download final attachments for special studies: 

• A: Benefit/Cost and Project Scoring of Historical Operations
• B: Cost-Effectiveness of Future Procurement
• C: Cost-Effectiveness of Peaker Replacement
• D: Procurement Policy Case Studies
• E: End Uses and Multiple Applications
• F: Safety Best Practices
• G: End of Life Options
• H: Stakeholder Engagement

Stakeholder Workshop #1
Study introduction and draft evaluation framework
May 26, 2021
Workshop presentation

Stakeholder Workshop #2
Final evaluation framework and initial observations on project use cases and operations 
September 30, 2021
​Workshop presentation

Stakeholder Workshop #3
Draft study findings, conclusions, and policy recommendations
​November 4, 2022
Workshop presentation

CPUC Energy Storage Procurement Study Draft Report
Draft report posted for stakeholder feedback
​October 24, 2022

​Download draft attachments for special studies:

• A: Benefit/Cost and Project Scoring of Historical Operations
• B: Cost-Effectiveness of Future Procurement
• C: Cost-Effectiveness of Peaker Replacement
• D: Procurement Policy Case Studies
• E: End Uses and Multiple Applications
• F: Safety Best Practices
• G: End of Life Options

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