Since November 2004, Enron has returned about $11.5 billion to creditors in twice-yearly distributions, in April and October, as well as in "catch-up" distributions paid on an interim basis every two months. Monday's distribution was its 15th to creditors, the company said.

Enron, once the nation's seventh-largest company, entered bankruptcy proceedings in December 2001 after years of accounting tricks could no longer hide billions in debt or make failing ventures appear profitable. The collapse wiped out thousands of jobs, more than $60 billion in market value and more than $2 billion in pension plans.

Enron founder Kenneth Lay and former chief executive Jeffrey Skilling were convicted last year for their roles in the company's collapse. Skilling is serving a sentence of more than 24 years. Lay's convictions for conspiracy, fraud and other charges were wiped out with his July death from heart disease.

"Today's distribution is another significant milestone in the liquidation process and represents a tremendous financial outcome for the Enron estate," said John Ray, president and chairman of the board. "The estate continues to focus on its principal mandate to sell remaining assets, settle claims, and prosecute litigation."

Monday's distribution consisted of about $1.7 billion in cash and $171.7 million in shares of Portland General Electric, Enron's former utility.