This excerpt taken from the PCG 8-K filed Oct 28, 2005.
Conditional Asset Retirement Obligations
In March 2005, the FASB issued Interpretation No. 47, Accounting for Conditional Asset Retirement Obligations - an interpretation of FASB Statement No. 143, or FIN 47. FIN 47 clarifies that a conditional asset retirement obligation refers to a legal obligation to perform an asset retirement activity. Accordingly, an entity is required to recognize a liability for the fair value of a conditional asset retirement obligation if the fair value of the obligation can be reasonably estimated. FIN 47 will be effective for the fourth quarter of 2005. PG&E Corporation and the Utility are currently evaluating the impact of FIN 47 on their Consolidated Financial Statements.