In the wake of

Pacific Gas & Electric's

(PCG) - Get PG&E Corporation Report

Chapter 11 filing on Friday, bank investors are eager to determine which institutions are exposed. A report today detailing PG&E's 20 largest unsecured claims shed a little light on the situation.

According to

BankruptcyData.com

,

Bank of New York

(BK) - Get Bank of New York Mellon Corporation Report

holds the largest unsecured claim, in the form of $2.2 billion worth of debt that varies in terms of repayment requirements. Bank of New York wasn't immediately available for comment.

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Bank of America

(BAC) - Get Bank of America Corp Report

is listed as holding the fifth-largest claim with an unsecured revolving credit of $938 million. Bank of America was the lead agent on a syndicated loan made to PG&E last October but said last week that its exposure to the utility is considerably less than the original loan amount. (Syndicated loans are large credits shared by three or more institutions.)

Gimme Credit

analyst Kathy Shanley focused on the uncertainty of PG&E's situation in her newsletter today, saying, "No one has a clue how it will all play out." Shanley adds, "It seems increasingly likely banks which lent to the utility will end up having to charge off at least some of their exposure."

Shanley went on to say that Bank of America,

J.P. Morgan Chase

(JPM) - Get JPMorgan Chase & Co. (JPM) Report

and six foreign banks "may face over $1 billion in exposure on letters of credit they provided to support municipal bonds sold by the California Pollution Control Authority on PG&E's behalf."

Pacific Gas & Electric, which is the utility unit of PG&E, filed for bankruptcy on Friday, listing assets of $24 billion against liabilities of $18 billion. PG&E, which is the holding company, did not file for bankruptcy.