Echelon's LONWORKS Networks Extend Reach of Jini Technology at JavaOne Conference
Demonstration Shows How the LONWORKS System Enables Jini Technology to Reach Millions of Devices

(SAN FRANCISCO, CA - June 14, 1999) - Echelon Corporation (NASDAQ: ELON) announced today that Sun is showing a demonstration at JavaOne of how LONWORKS® enabled consumer and other devices can participate as services on a Jini(tm) network.

The demonstration at Sun's JavaOne Developer's Conference highlights how connectivity to Echelon's internationally recognized LONWORKS device networking standard and Sun's Jini technology can deliver the next wave of highly distributed, service-based networking. LONWORKS networks are currently used in homes, buildings, factories, utilities, trains, airplanes and other applications to inexpensively extend automated, intelligent control down to the most elemental functional levels of a system.

In the demonstration at JavaOne, a LONWORKS network containing light switch and load controller devices from Leviton Manufacturing and a multifunction temperature, occupancy and ambient light level sensor from Hubbell Wiring Devices interact via a LONWORKS proxy for Jini with a Jini enabled camera, printer and disk drive. The LONWORKS proxy for Jini, based on Echelon's LNS(tm) network operating system, leverages the automatic discovery and self-documentation features of LONWORKS devices to detect and register each device's functionality as Jini services. No additional hardware or software in the devices themselves or any device-specific drivers in the proxy is required. The end result is delivery of the Jini vision of simple, ``plug and work'' networking for consumer and other control devices.

"Connectivity to Echelon's LONWORKS system provides the means for Jini technology to extend to millions of control devices worldwide,'' said Mike Clary, General Manager and VP, Consumer and Embedded Sun Microsystems Inc. "These devices include everything from heating and air-conditioning systems to kitchen appliances -- providing services over the net.''

"By combining LONWORKS networks and Jini technology, any LONWORKS device can become a provider of Jini services,'' said Ken Oshman, president and CEO of Echelon Corporation. "Like Sun, we envision a world where anyone will be able to plug-and-participate anytime, from anywhere, using services from any device.''

All of the LONWORKS devices in the demonstration are designed to the LONMARK® interoperability guidelines and bear the LONMARK logo, a mark that signifies products designed for easy integration in open multivendor control networks.

About Echelon Corp.
Echelon Corporation (NASDAQ: ELON) is the developer of LonWorks networks, recognized internationally as a standard for interoperable control networks. With thousands of application developers and millions of devices installed worldwide, the LonWorks system is a leading open, networked control solution for building and home automation, industrial, transportation, and public utility applications. Echelon offers a full range of off-the-shelf hardware and software products to support the development, installation and management of intelligent, open and interoperable control networks. Echelon is based in Palo Alto, California with international offices in China, France, Germany, Japan, Korea, The Netherlands and the United Kingdom. News and information are available at http://www.echelon.com.

About the LONMARK Interoperability Association
Since its inception in May 1994, the LONMARK Interoperability Association has become a major driving force in the establishment of interoperable standards for building, industrial and residential/utility automation. LONMARK membership is open to any manufacturer, end user, or system integrator committed to the development and use of open, interoperable products using multivendor LONWORKS control networks. Products that have been verified to conform to the LONMARK Interoperability Guidelines are eligible to carry the LONMARK logo. Further information on the LONMARK Interoperability Association and its members can be found on the LONMARK Association website at http://www.LONMARK.org.

Echelon, LONWORKS, LONMARK, the LONMARK logo, and the Echelon logo are registered trademarks of Echelon Corporation registered in the U.S. and other countries. LNS is a trademark of Echelon Corporation in the U.S. and other countries. Other marks belong to their respective holders.

This press release may contain statements relating to future plans, events or performance. Such statements may involve risks and uncertainties, including risks associated with uncertainties pertaining to the timing and level of customer orders, demand for products and services, development of markets for Echelon's products and services and other risks identified in Echelon's SEC filings. Actual results, events and performance may differ materially. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof. Echelon undertakes no obligation to release publicly the result of any revisions to these forward-looking statements that may be made to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

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