Calpine Corporation Taps Bottomline Technologies for Automated Corporate Payments.

Business/Technology Editors

PORTSMOUTH, N.H. and SAN JOSE, Calif.--(BUSINESS WIRE)--June 6, 2000

Leading power company to implement Bottomline's premier PayBase 32

Bottomline Technologies(R) (NASDAQ: EPAY), the premier provider of Web-enabled billing, payment, and electronic banking solutions, today announced that Calpine Corporation, a San Jose, California-based independent power company dedicated to providing customers with reliable and competitively priced electricity, has selected Bottomline's PayBase software. Calpine Corporation has deployed Bottomline's premier payment suite to replace an existing solution provided by Standard Register.

"Achieving a higher degree of automation was the goal of selecting a payment solution," said Chuck Clark, vice president and controller for Calpine Corporation. "Bottomline's offering was tailored to easily integrate with our PeopleSoft financials package, and to provide us with several important payment functions. PayBase's dual payment capability will allow us to create either an electronic or paper check from one centralized file."

PayBase will port to Calpine's PeopleSoft Financials and Oracle database to produce Automated Clearing House (ACH) payments for employee T&E and vendor payables. PayBase will automate wires for vendor payments, a process that previously was time consuming and labor intensive. Bottomline's robust solution will also enable Calpine to automate royalty payments to its geothermal lease-holders.

"We are very excited to include Calpine among our base of customers in the utilities sector," remarked Dan McGurl, president and CEO of Bottomline Technologies. "With importance of reliability associated with its name, Calpine's selection of PayBase is a ringing endorsement of the product's proven track record of consistency and performance."

About Calpine Corporation

Based in San Jose, Calif., Calpine Corporation is the leading U.S. independent power company dedicated to providing customers with reliable and competitively priced electricity. Nationally, Calpine currently has a combined interest in approximately 17,900 megawatts of electric generating capacity in operation, under construction or announced development in 21states across the country -representing the largest power development program in the U.S. The company was founded in 1984 and is publicly traded on the New York Stock Exchange under the symbol CPN. For more information about Calpine, visit its website at www.calpine.com http://www.calpine.com.

About Bottomline Technologies

Bottomline Technologies(R) (NASDAQ: EPAY) is the leading provider of Web-enabled billing, payment, and electronic banking solutions for the business-to-business market. Bottomline's three integrated e-business offerings enable corporations and financial institutions worldwide to integrate, automate, and streamline the entire financial supply chain. PayBase(R) provides a pathway from traditional paper checks to electronic payments, as well as sophisticated messaging, remittance, and anti-fraud tools. NetTransact(TM), the Company's business-to-business bill presentment and payment suite, enables enterprise billers and their trading partners to electronically present, adjudicate, and pay bills on-line. Bottomline's BankQuest(TM) is a corporate and institutional browser-based electronic banking platform that provides information reporting and transactional services for cash management, trade finance, and securities processing. Today, Bottomline's offerings are utilized by over 2,500 organizations representing every major industry sector. Founded in 1989, Bottomline maintains its headquarters in Portsmouth, NH and has satellite offices located in most major cities. For more information, dial [phone] or visit Bottomline on the web at www.bottomline.com

This press release may contain forward-looking statements that involve risks and uncertainties, including statements regarding expected benefits of use of the Company's products and future growth or results. Among the important factors which could cause actual results to differ materially from those in the forward-looking statements are competition, market demand, technological change, strategic relationships, recent acquisitions, international operations and general economic conditions. For additional discussion of factors that could impact the Company's financial results, refer to the Company's Form 10-K filed September 1999.