November 19, 2017

CLEARSIGN COMBUSTION CORPORATION
ClearSign's Initial Installation Assessment Completed by Aera Energy
Applies for Operating Permit for First Unit

April 21, 2017

ClearSign Combustion Corporation (NASDAQ: CLIR), an emerging provider of industrial combustion technologies that help reduce emissions and improve efficiency, announced the conclusion of experimental permit status for its first Once Through Steam Generator (OTSG) project provided to Aera Energy, LLC and application for a permanent operating permit.

Aera applied for "authority to construct," constituting permanent operating status, to the local regulatory body, the San Joaquin Valley Air Pollution Control District.  

ClearSign's Duplex technology is in use in a variety of industrial combustion applications including OTSG's, refinery process heaters, and flares, and has achieved world wide recognition for combining efficiency with extremely low emissions of criteria pollutants such as NOx and CO2.  

"Aera has been an early adopter of our innovative Duplex technology," said Steve Pirnat, Chairman and CEO of ClearSign. "We look forward to completing current and future projects with Aera as they continue to demonstrate their commitment to environmental leadership."

For more information on ClearSign and its Duplex technology, visit www.clearsign.com.

About ClearSign Combustion Corporation 

ClearSign Combustion Corporation designs and develops products and technologies for the purpose of improving key performance characteristics of combustion systems, including emissions and operational performance, energy efficiency and overall cost-effectiveness. Our patented Duplex , Duplex Plug & Play and Electrodynamic Combustion Control platform technologies enhance the performance of combustion systems in a broad range of markets, including the energy (upstream oil production and down-stream refining), commercial/industrial boiler, chemical, petrochemical, and power industries. For more information, please visit www.clearsign.com.

Cautionary note on forward-looking statements

All statements in this press release that are not based on historical fact are "forward-looking statements." While management has based any forward-looking statements included in this press release on its current expectations, the information on which such expectations were based may change. These forward-looking statements rely on a number of assumptions concerning future events and are subject to a number of risks, uncertainties and other factors, many of which are outside of our control, which could cause actual results to materially differ from such statements. Such risks, uncertainties and other factors include, but are not limited to, general business and economic conditions, the performance of management and our employees, our ability to obtain financing, competition, whether our technology will be accepted and other factors that are to be detailed in our periodic and current reports available for review at www.sec.gov. Furthermore, we operate in a competitive environment where new and unanticipated risks may arise. Accordingly, investors should not place any reliance on forward-looking statements as a prediction of actual results. We disclaim any intention to, and undertake no obligation to, update or revise forward-looking statements to reflect events or circumstances that subsequently occur or of which we hereafter become aware.

For more information

ClearSign Combustion Corporation

www.clearsign.com/


Matthew Selinger
Three Part Advisors, LLC for ClearSign
mselinger@threepa.com
+1 817-310-8776

Brittney Garneau
Pierpont Communications for ClearSign
, bgarneau@piercom.com


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