Large-Scale Sulfur Thermal Battery Demonstration for Enhanced Grid Flexibility and Increased Renewable Penetration – REVISED (SCH # 2019070641)

2 Documents in Project


SCH Number
Public Agency
California Energy Commission
Document Title
Large-Scale Sulfur Thermal Battery Demonstration for Enhanced Grid Flexibility and Increased Renewable Penetration – REVISED (SCH # 2019070641)
Document Type
NOE - Notice of Exemption
Document Description
The project will construct and demonstrate a long-duration energy storage system using Element 16’s Sulfur Thermal Storage technology at an existing industrial facility in Duarte, CA. The energy storage system will be located on already developed and paved land at an existing industrial facility. The project benefits ratepayers by demonstrating sulfur thermal battery storage technology that can provide long-duration backup power, shift electricity loads of industrial facilities, and lower costs compared to lithium-ion battery alternatives.

Contact Information

Bryan Lee
Agency Name
California Energy Commission
Job Title
Mechanical Engineer
Contact Types
Lead/Public Agency


Arcadia, Duarte
Los Angeles
Southern California
Cross Streets
Mt. Olive Drive
Other Location Info
2301 Central Ave Duarte 91010 11631 Clark St Ste 101 Arcadia 91006

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Cal. Code Regs., tit. 14, § 15301
Reasons for Exemption
California Code of Regulations, title 14, section 15301 provides that projects which consist of the operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographical features, involving negligible or no expansion of existing or former use are categorically exempt from CEQA. This project is exempt under Cal. Code Regs., tit 14, § 15301 because it involves the construction of an energy storage system within a footprint of approximately 10ft x 30ft at an existing industrial facility in Duarte. The system will be sited on a paved area behind the industrial facility, with no other buildings or facilities within 100 ft. For these reasons, the project will not have a significant effect on the environment and falls under the categorical exemption listed in 14 C.C.R. 15301. The Energy Commission made CEQA findings pertaining to this project, including finding that it was categorically exempt under CCR tit. 14, sections 15301 when the Energy Commission originally approved the agreement on July 25, 2019. The currently proposed changes through this amendment involve changing the demonstration site. The change will not result in any environmental impacts beyond those already considered by the Commission. This amended Notice of Exemption provides documentation of the demonstration site change and the CEC's analysis regarding CEQA.


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