ClearSign Field Test At Aera Validates Savings In Operating Costs With Industry-Leading Emissions

Increase in efficiency validated; Duplex™ Technology now operating at 52 Million Btu/h

Seattle, WA /PRNewswire/ - ClearSign Combustion Corporation (NASDAQ: CLIR) announced today it has validated a measurable and significant increase in energy efficiency in a Once-Through Steam Generator (OTSG) used for Enhanced Oil Recovery (EOR) operating at Aera Energy LLC's Belridge field outside Bakersfield, CA. The unit, now operating at a higher firing rate, continues to provide sub 5 PPM NOx while maintaining steam capacity and quality.

ClearSign Chairman and CEO, Steve Pirnat, said "This is a significant milestone achievement for the company. We have now validated at a customer site, and at full industrial scale, that Duplex Technology can achieve the industry's lowest NOx emissions, and that it actually increases energy efficiency. To our knowledge, Duplex is the only low-NOx combustion equipment that can make this claim. Proving that effectively lowering emissions doesn't have to result in a cost penalty is truly a game-changer. This is a win for the environment and a win for the customer."

ClearSign reports the superior environmental performance of Duplex Technology has been validated at an increased firing rate of 52 Million Btu/hr, while also showing a thermal efficiency improvement of the order of 1% when compared to a baseline case with a conventional low NOx burner without Flue Gas Recirculation (FGR). OTSG systems typically operate with FGR to lower NOx emissions. FGR, however, penalizes thermal efficiency, increasing fuel and electricity costs. ClearSign estimates the comparison of Duplex versus systems operating with FGR will provide an overall energy savings of as much as 3 - 4%, representing a reduction in annual operating expense of between $90,000 and $100,000 at current local natural gas and electricity prices. The validation demonstrated the supply of steam at the capacity and quality required for oil field operations.

In February it was reported that, using ClearSign Duplex Technology, the OTSG unit was operating at 42.5 Million Btu/hr while meeting the San Joaquin Valley Air Pollution Control District's Rule 4320, which requires NOx emissions of 5 PPM or less (corrected at 3% O2).

About Aera Energy
Aera Energy LLC is one of California's largest oil and gas producers, accounting for nearly 25 percent of the state's production. With headquarters in Bakersfield, most of the company's production is centered in the San Joaquin Valley. Aera also has oil field operations in Ventura and Monterey counties.

About ClearSign Combustion Corporation
ClearSign Combustion Corporation designs, develops and markets technologies that drive to improve key performance characteristics of combustion systems, including emissions and operational performance, energy efficiency and overall cost-effectiveness. Our patent-pending Duplex™ and Electrodynamic Combustion Control™ platform technologies enhance the performance of combustion systems in a broad range of markets, including the chemical, petrochemical, refinery, power and commercial boiler industries. For more information, please visit www.clearsign.com

Cautionary note on forward-looking statements
This press release includes forward-looking information and statements within the meaning of the Private Securities Litigation Reform Act of 1995 and the provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Except for historical information contained in this release, statements in this release may constitute forward-looking statements regarding our assumptions, projections, expectations, targets, intentions or beliefs about future events that are based on management's belief, as well as assumptions made by, and information currently available to, management. While we believe that our expectations are based upon reasonable assumptions, there can be no assurances that our goals and strategy will be realized. Numerous factors may affect our actual results and may cause results to differ materially from those expressed in forward-looking statements made by us or on our behalf. Some of these factors include the acceptance of existing and future products, the impact of competitive products and pricing, general business and economic conditions, and other factors detailed in our Annual Report on Form 10-K and other periodic reports filed with the SEC. We specifically disclaim any obligation to update or revise any forward-looking statement whether as a result of new information, future developments or otherwise.