CONTACT INFORMATION

SAN FRANCISCO, CA; July 7, 2004 -Tucson Electric Power (TEP), a long-time user of SPL's CIS PLUS customer information system, will move to CorDaptix, SPL's more advanced customer care and billing solution to serve its more than 360,000 electricity customers.

The migration is expected to produce a savings to TEP from process improvements and consolidations.

"The roots of CorDaptix lie in CIS PLUS, SPL's first CIS product," explained SPL's Dave Mulit, general manager of the Americas. "But the product was built from the ground up, with new design concepts. As a result, it is exceptionally efficient. And it provides new functions through configuration, not customization, making it very easy to change and upgrade."

A richer set of options make it possible to respond to specific customer needs. These include:

• Sophisticated interval data & billing options
• Sales and marketing features that give utilities the specific Customer Relationship Management (CRM) functions they need - a concept SPL calls "SPL Practical CRM."
• A wider variety of options for customers who need special arrangements for paying bills (pay plans, non-billed budgets, etc.).

Because it is easier to use, the CorDaptix solution reduces training costs and errors. Tools reduce the cost of implementation and operation. CorDaptix also offers extensive deregulated functionality for utilities transitioning to or facing retail competition.

"CorDaptix offers us unprecedented opportunities to reduce costs and expand customer services simultaneously. We're eagerly anticipating the project go-live in October 2005," said Steve Glaser, Senior Vice President and COO.

TEP has also committed to a four-year maintenance contract.

# # #

About Tucson Electric Power
Tucson Electric Power, which provides electricity to more than 360,000 customers in southern Arizona, is a subsidiary of UniSource Energy Corporation (NYSE: UNS). It is the only two-time winner of the Points of Light award for Excellence in Workplace Volunteer Programs and, as part of its GreenWatts program, built the Western Hemisphere's single largest operating photovoltaic solar generation site, located in Springerville, Arizona.

About SPL
As the world leader in customer care and billing software, SPL WorldGroup helps energy and service companies achieve excellence in billing, customer care, sales and marketing. Using outstanding technology and its unparalleled implementation success record, SPL helps its clients attract, nurture and maximize the value of their customers. From prospect management, billing and customer care through quoting and credit and collections, SPL provides energy, water and service companies with strategic options for managing residential, commercial and industrial customers in both regulated and competitive markets, across multi-product service lines. Led by an experienced and visionary management team, and in partnership with the world's leading systems integrators and technology innovators, SPL's 600 professionals in North America, Europe, the Middle East and Asia Pacific dedicates themselves to providing value to clients by implementing solutions that fit the specific needs of energy, water and service related companies and building long-term relationships based on confidence and trust. Visit SPL WorldGroup at www.splwg.com or call 1-973-539-6268 (New Jersey), 1-866-468-6775 (San Francisco), or, within the US and Canada, 1-800-275-4775.

(2004 SPL WorldGroup, Inc. All Rights Reserved. SPL WorldGroup, SPL, and CorDaptix are trademarks owned by SPL WorldGroup B.V. or its subsidiaries. SPL WorldGroup and SPL are registered as trademarks in the United States and in certain other jurisdictions. All other trademarks and brand, product and company names herein are used for identification purposes only and are the property of their respective owners.