This excerpt taken from the PCG DEF 14A filed Apr 1, 2009.
Why did the company mail a notice regarding the Internet availability of proxy materials instead of a full set of proxy materials?
PG&E Corporation and Pacific Gas and Electric Company have elected to provide access to their proxy materials over the Internet, in accordance with rules adopted by the Securities and Exchange Commission. This distribution process conserves natural resources and reduces the cost of printing and distributing the companies' proxy materials.
The proxy materials are available on the website referenced in the Notice of Annual Meeting and Internet Availability of Proxy Materials. For shareholders who prefer to access the proxy materials in printed form, the Notice also contains instructions on how to request a printed set of proxy materials by mail.