- Power Slope Targeting Optimizes Power Output for DC Generators -

Calgary Alberta, Canada - September 28, 2006 - Sustainable Energy Technologies Ltd ("Sustainable Energy" - TSXV: "STG") that the United States Patent and Trademark Office has issued a new patent on a new control logic concept developed by the Company for optimizing performance of fuel cell power modules and other similar DC generators.

Power Slope Targeting will simplify the control of fuel cell systems by reducing measurement requirements and improve performance by allowing feed-back control of fuel flow based on measured power output.

"This new approach, which focuses on optimizing the system integration and performance of the fuel cell stack, has the potential significantly reduce the cost of the fuel cell's balance of plant, and should lead to more rapid commercialization of fuel cell power modules," said Brent Harris, P. Eng. Director of Technology Development for Sustainable Energy and a co-inventor of the Company's technology.

Sustainable has been supplying its patented low-voltage/high-current inverters to leading fuel cell developers for several years, and the Company has recently launched its SUNERGY line of inverters for solar and small wind power systems, using the same power electronics platform refined and proven in the fuel cell environment. The faster, more stable control loops which enable the power slope targeting also enable faster, more productive maximum power point tracking, and higher energy yields for small wind turbines in gusty conditions.

About Sustainable Energy

Based in Calgary Alberta, Sustainable Energy (www.sustainableenergy.com) develops manufactures and markets advanced power inverters for the renewable energy industry. Power inverters are strategic to the integration of new renewable energy technologies - solar and wind power, fuel cells, and energy storage systems - into the high quality power demands of the modern electrical grid.

The SUNERGY inverter is the first to directly link low voltage generation and storage systems to the power grid in a single power conversion step, delivering very high quality power, and electrical conversion efficiencies that are among the highest in the industry.

Certain statements contained in this press release may be considered as forward-looking. Such forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from estimated or implied results.



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