The Enron Scandal: How America's Most Innovative Company Became Its Biggest Fraud

Editor's Note

Enron was once ranked the seventh-largest company in the United States by revenue and was named Fortune's Most Innovative Company for six consecutive years. Its collapse in December 2001 revealed that the innovation was largely in the accounting. The scandal destroyed one of the Big Five audit firms, sent executives to prison, and produced landmark corporate governance legislation that reshaped American business.

Building the Energy Colossus

Enron Corporation was born in 1985 from the merger of Houston Natural Gas and InterNorth, two mid-sized pipeline companies. Kenneth Lay, who had served as CEO of Houston Natural Gas, became chairman and CEO of the combined entity. The early years were unremarkable; Enron operated gas pipelines and power plants much like any other energy utility.

The transformation began in 1990, when Lay hired Jeffrey Skilling from McKinsey & Company. Skilling arrived with a radical vision: Enron would not merely transport energy but trade it. He proposed treating natural gas contracts like financial instruments, creating a market where buyers and sellers could trade future deliveries at transparent prices. The idea was to apply the logic of Wall Street to the energy sector, and it worked brilliantly at first. By the mid-1990s, Enron had become the dominant intermediary in North American natural gas markets McLean and Elkind (2003).

Skilling pushed Enron into ever more exotic markets: electricity, broadband, weather derivatives, water, even advertising space. The company's Houston headquarters buzzed with the energy of a trading floor, and its stock price climbed relentlessly. Enron's market capitalization peaked at roughly $70 billion in late 2000, and its executives were celebrated as visionaries who were reinventing American capitalism.

The Accounting Illusion

The engine of Enron's apparent success was a set of accounting practices that ranged from aggressive to fraudulent. The most consequential was mark-to-market accounting. In 1991, Skilling persuaded the Securities and Exchange Commission to allow Enron to use mark-to-market accounting for its energy trading operations; a method previously reserved for financial trading firms. Under this approach, when Enron signed a long-term contract; say, a twenty-year agreement to supply natural gas; it could immediately book the entire projected profit as current revenue, even though no cash had changed hands and the actual profitability of the contract depended on assumptions about energy prices decades into the future.

This created an insatiable need for new deals. Each quarter, Enron needed to announce ever-larger contracts to show revenue growth, because previously booked profits were already on the books. When actual cash flows failed to match the projections, the gap had to be filled with still more aggressive accounting or hidden through other means Healy and Palepu (2003).

The other means came primarily through Andrew Fastow, Enron's chief financial officer. Fastow created a network of special purpose entities; off-balance-sheet partnerships with names like LJM1, LJM2, Chewco, and JEDI; that served multiple purposes. They allowed Enron to move underperforming assets off its balance sheet, making the company appear less indebted than it actually was. They generated artificial profits through transactions between Enron and the SPEs. And they enriched Fastow personally: he earned at least $30 million in management fees from the partnerships he controlled, a direct conflict of interest that the Enron board waived on two separate occasions.

The House of Cards

The SPE structure was engineered to exploit a loophole in accounting rules. At the time, a company could keep an entity off its balance sheet if an independent outside investor contributed at least 3 percent of the equity. In many of Enron's SPEs, this "independent" investor was either an Enron employee or a party whose investment was secretly guaranteed by Enron itself. The Chewco partnership, for example, was managed by Michael Kopper, a member of Fastow's team, and its outside equity came partly from loans guaranteed by Enron; a circular arrangement that violated the very rules it was designed to exploit.

The scale of the deception was staggering. By 2000, Enron had created more than 3,000 special purpose entities. Together, they concealed approximately $25 billion in debt from Enron's reported financial statements. The company's actual debt-to-equity ratio was roughly four times what it reported to investors and credit rating agencies Bratton (2002).

The Whistleblower and the Unraveling

On August 14, 2001, Jeffrey Skilling abruptly resigned as CEO after just six months in the role, citing personal reasons. His departure puzzled Wall Street. The stock was already declining, having fallen from $90 to about $40.

Behind the scenes, the alarm had already been raised. In August 2001, Sherron Watkins, a vice president in Enron's corporate development division, wrote a seven-page memo to Kenneth Lay warning that the company might "implode in a wave of accounting scandals." She identified the SPE structures as fraudulent and warned that Enron's accounting practices could not withstand scrutiny. Lay forwarded the memo to Enron's law firm, Vinson & Elkins, which conducted a limited review and concluded there was no cause for concern; a finding that would later be condemned by congressional investigators.

Events accelerated in October. On October 16, Enron reported a $618 million third-quarter loss and disclosed a $1.2 billion reduction in shareholder equity related to Fastow's partnerships. The SEC opened a formal investigation. On November 8, Enron filed restated financial statements going back to 1997, revealing $586 million in previously hidden losses and acknowledging that it had overstated earnings for years. The restatement also added $2.6 billion in debt to the balance sheet.

Credit rating agencies; which had maintained investment-grade ratings on Enron's debt until the very end; finally downgraded the company to junk status on November 28. A last-ditch merger with Dynegy collapsed. On December 2, 2001, Enron filed for Chapter 11 bankruptcy protection with $63.4 billion in assets, making it the largest bankruptcy in American history at that time; a record it would hold for less than a year before being surpassed by WorldCom and then by the financial institutions that fell during the 2008 crisis.

The Destruction of Arthur Andersen

Enron's auditor, Arthur Andersen, was one of the "Big Five" accounting firms, with 85,000 employees worldwide and a century of history. The firm had signed off on Enron's financial statements year after year, even as the accounting grew more aggressive. Andersen had also served as Enron's internal auditor and consultant, collecting $52 million in fees in 2000 alone; a conflict of interest that compromised its independence.

When the SEC investigation began, Andersen employees at the Houston office began shredding Enron-related documents on a massive scale. Over a period of several weeks, the firm destroyed an estimated one ton of paper documents and deleted thousands of electronic files. On June 15, 2002, a jury convicted Arthur Andersen of obstruction of justice. Although the Supreme Court unanimously reversed the conviction in 2005 on narrow procedural grounds, the firm had already ceased auditing public companies. The Big Five became the Big Four.

Consequences and the Sarbanes-Oxley Act

The human cost was severe. Approximately 20,000 Enron employees lost their jobs. Many also lost their retirement savings, because Enron's 401(k) plan was heavily invested in company stock; stock that employees were barred from selling during a "lockdown" period even as executives cashed out hundreds of millions of dollars in personal holdings. Shareholders lost approximately $74 billion in the four years before Enron's bankruptcy.

The criminal prosecutions that followed reshaped corporate America's understanding of executive accountability. Andrew Fastow pleaded guilty to two counts of conspiracy and was sentenced to six years in prison. Jeffrey Skilling was convicted on 19 counts of fraud and conspiracy and sentenced to 24 years in prison, later reduced to 14 years. Kenneth Lay was convicted on six counts of fraud and conspiracy in May 2006 but died of a heart attack in July 2006 before sentencing; under federal law, his conviction was vacated.

The legislative response was swift. The Sarbanes-Oxley Act, signed by President George W. Bush on July 30, 2002, imposed the most significant changes to corporate governance since the Securities Exchange Act of 1934. It required CEOs and CFOs to personally certify financial statements, established the Public Company Accounting Oversight Board, prohibited accounting firms from providing consulting services to their audit clients, mandated independent audit committees, and increased criminal penalties for securities fraud to a maximum of 25 years in prison.

The Enron scandal, alongside the dot-com bubble's collapse, marked the end of an era of exuberant deregulation and uncritical faith in corporate self-governance. Its lessons about the dangers of unchecked financial complexity and misaligned incentives remain as relevant as ever; as the financial world would discover again, with far greater consequences, in 2008.