Ontario Power Generation Joins ADA-ES Mercury Project Team

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TO ENERGY AND ENVIRONMENTAL EDITORS:

Ontario Power Generation Joins ADA-ES Mercury Project Team

COLORADO, LITTLETON, Mar. 21 -/E-Wire/-- Environmental technology and specialty chemical company ADA-ES, a subsidiary of Earth Sciences (OTC Bulletin Board: ESCI), announced today that Ontario Power Generation (OPG) has joined its mercury control project team and will provide significant funding to cover project costs.

In October 2000, ADA-ES began work on a comprehensive mercury emissions control program to evaluate the technology that power generating companies will use to comply with new mercury regulations that will be proposed by the U.S. Environmental Protection Agency in 2003. This work is being performed under a $6.8 million cooperative agreement with the U.S. Department of Energy National Energy Technology Laboratory (DOE/NETL).

As one of the largest electric utilities in Canada, OPG has been closely following the developments of mercury control technologies in the U.S. and has been on the forefront of investigating methods to control the emission of mercury into the environment.

"We welcome Ontario Power's participation with the program. They will be a valuable member of the team, bringing their many years of experience in emissions controls," said Michael Durham, who heads the project for ADA-ES. "In fact, a standard testing method used in the U.S. for evaluating mercury emissions from fossil-fueled generating stations was developed by and is named for OPG's predecessor."

Under the DOE/NETL cooperative agreement, ADA-ES is working in partnership with PG&E; National Energy Group, Wisconsin Electric, a subsidiary of Wisconsin Energy Corp., Alabama Power Company, a subsidiary of Southern Company (NYSE: SO) and EPRI. The DOE will fund $4.5 million of the $6.8 million project while the other participating companies will co-fund the remaining $2.3 million.

"OPG is pleased to be supporting this exciting mercury project," said Blair Seckington, senior technology advisor for Ontario Power Generation. "We are encouraged that this project will help move mercury reduction technology out of the laboratory and test its commercial viability."

During the three-year project, mercury control systems will be installed and tested at four coal-fired power plants. ADA-ES has developed a mercury control system in which sorbents are injected into the flue gas and collected by existing particle collection systems. The sorbents will absorb the mercury, resulting in substantial emissions reduction. According to DOE/NETL, the goal of the project is to develop a cost-effective technology that will allow the electric utility industry to reduce mercury emissions from power plants by up to 70 percent of current levels.

About ADA-ES Headquartered in Littleton, Colo., ADA-ES is an environmental technology and specialty chemical company that brings 25 years of experience to improve responsible profitability for electric power and industrial companies through proprietary products and systems that mitigate environmental impact while reducing operating costs. ADA-ES is a subsidiary of Earth Sciences, whose common stock trades on the OTCBB under the symbol ESCI.

About Ontario Power Generation Ontario Power Generation is an Ontario based generating company whose principal business is the generation and sale of electricity to consumers in Ontario and into the interconnected markets. OPG's goal is to be a premier, low-cost power generation and wholesale energy sales company in its market area, while operating in a safe, open and environmentally responsible manner.

This press release may contain forward-looking information within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. The United States Private Securities Litigation Reform Act of 1995 provides a "safe harbor" for such forward- looking statements in this document that are based on information the Company believes reasonable, but such projections and statements involve significant uncertainties. Actual events or results could differ materially from those discussed in the forward-looking statements as a result of various factors including but not limited to changing market demand for ADA-ES chemicals and systems and changes in technology, laws or regulations, demand for the Company's securities, and other factors discussed in the Company's 1999 Form 10-KSB and recent Form 10-QSBs.

Michael Durham of ADA-ES, [REDACTED-PHONE], [REDACTED-PHONE],

[REDACTED-EMAIL]; or Ted Gruetzner, Media Relations of Ontario Power

Generation, [REDACTED-PHONE], or [REDACTED-PHONE]; Natalie Wilkins of Clarus Public

Relations, [REDACTED-PHONE], ext. 239, [REDACTED-EMAIL], for ADA-ES

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