EXHIBIT 23.3 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of Catalytica, Inc. of our report on Genxon Power Systems L.L.C., dated October 26, 1998, relating to the financial statements, which appears in the Catalytica, Inc. Annual Report on Form 10-K as of December 31, 1998. /s/ PricewaterhouseCoopers LLP San Jose, California September 22, 1999