Question: Lou Lung Pai was CEO of what American energy, commodities, and services company based in Houston, Texas?

Context paragraphs:
Enron scandal: The Enron scandal, publicized in October 2001, eventually led to the bankruptcy of the Enron Corporation, an American energy company based in Houston, Texas, and the "de facto" dissolution of Arthur Andersen, which was one of the five largest audit and accountancy partnerships in the world.  In addition to being the largest bankruptcy reorganization in American history at that time, Enron was cited as the biggest audit failure.

CenterPoint Energy: CenterPoint Energy is a Fortune 500 electric and natural gas utility serving several markets in the U.S. states of Arkansas, Louisiana, Minnesota, Mississippi, Oklahoma, and Texas.  It was formerly known as Reliant Energy (from which it is now separated), NorAm Energy, Houston Industries, and HL&P.  The company is headquartered in the CenterPoint Energy Tower at 1111 Louisiana Street in Downtown Houston.  Some of its notable subscribers include Retail Electric Providers (REPs), such as NRG Energy, Champion Energy, Dynowatt, Ambit Energy, Texas Power, Bounce Energy, MXenergy, Direct Energy, Stream Energy, First Texas Energy Corporation, Gexa Energy, Cirro Energy, and Kona Energy.

Enron: Enron Corporation was an American energy, commodities, and services company based in Houston, Texas.  It was founded in 1985 as the result of a merger between Houston Natural Gas and InterNorth, both relatively small regional companies.  Before its bankruptcy on December 2, 2001, Enron employed approximately 20,000 staff and was one of the world's major electricity, natural gas, communications and pulp and paper companies, with claimed revenues of nearly $101 billion during 2000. " Fortune" named Enron "America's Most Innovative Company" for six consecutive years.

Boardwalk Pipeline Partners: Boardwalk Pipeline Partners, LP is an energy company based in Houston, Texas.  It is a master limited partnership operating in the midstream portion of the natural gas and natural gas liquids (NGLs) industry, primarily providing transportation and storage for those commodities.  Boardwalk owns approximately 14,365 mi of natural gas and NGLs pipelines and underground storage caverns having aggregate capacity of approximately 205 billion cubic feet (Bcf) of working natural gas and 24.0 million barrels (MMbbls) of NGLs.  Boardwalk's pipeline system originates in the Gulf Coast region, Oklahoma and Arkansas and extends north and east to the Midwestern states of Tennessee, Kentucky, Illinois, Indiana, and Ohio, and Boardwalk's NGLs pipeline and storage facilities are located in Louisiana and Texas.  Boardwalk's common units are traded under the symbol "BWP" on the New York Stock Exchange (NYSE).

NRG Energy: NRG Energy, Inc. is a large American energy company, dual-headquartered in West Windsor Township, New Jersey, and Houston, Texas.  It was formerly the wholesale arm of Xcel Energy, and was spun off in bankruptcy in 2004.

Prisma Energy International: Prisma Energy International Inc., was a former subsidiary of Enron Corporation, formed in 2003 to own and manage the majority of Enron's overseas assets, formerly known as "Enron International".  Prior to its official organization, Prisma was referred to within Enron as "InternationalCo".  Enron's original bankruptcy reorganization plan, presented in early 2002, would have created a company broadly similar to Prisma (known under the working name "OpCo Energy"), but including Portland General Electric and the energy trading business, both later divested separately.  As one of the final steps in Enron's liquidation, following their 2001 bankruptcy, Prisma was sold to Ashmore Energy International Ltd., a unit of Ashmore Group Plc., in 2006.  Prisma was structured as an 'offshore' United States corporation incorporated in the British Overseas Territory of the Cayman Islands, but with its headquarters in Houston, Texas.  It served as a holding company for 15 gas and electricity businesses.  Its subsidiary, Prisma Energy International Services LLC, employed approximately 125 individuals, most at its headquarters in Houston, Texas.  Assets in which Prisma Energy managed an interest employed an additional 6,500 employees worldwide.  Following its 2006 sale to Ashmore Energy International Limited, Prisma Energy International Inc. was merged/amalgamated with Ashmore Energy International Limited with Prisma Energy being the survivor company.  In December 2006, Prisma Energy International Inc. changed its name to Ashmore Energy International and, subsequently, in May 2007 to AEI.

Excon Worldwide, Inc.: Excon Worldwide, Inc. is a Canadian energy, commodities, equities, and services company based in Toronto with other offices worldwide.  Its main location is in Toronto, Ontario, Canada.  The group comprises many specialized international offices and subsidiaries.  Excon Worldwide has more than seven thousand employees around North America and participates in markets around the world, including Canada, the United States, the UK, Australia, New Zealand, Asia, and the Middle East.  Excon Worldwide has offices around the world including Toronto, Los Angeles, Las Vegas, New Yor City, Houston, Texas and Hong Kong.

East Resources: East Resources, Inc., was an oil and gas exploration and production company with a focus on unconventional shale oil and gas resources in the US.  The company was founded in 1983 by Terrence Pegula.  East Resources sold most of its assets to Royal Dutch Shell in 2010 for $4.7 billion and the rest to American Energy in 2014 for $1.75 billion as Pegula shifted his focus to sports and entertainment properties (Pegula used most of the money from the American Energy sale to purchase the Buffalo Bills).  East Resources still maintains some natural gas assets.

Edward L. Morse: Edward Lewis Morse (born January 5, 1942 in New York City) is an American energy economist.  He is currently the Global Head of Commodities Research at Citigroup in New York.  From 1969 to 1975, he taught at the Woodrow Wilson School at Princeton University.  From 1979 to 1981, Morse served as Deputy Assistant Secretary of State for International Energy Policy.  From 2006 to 2008, he was chief energy economist at Lehman Brothers, where he argued the oil price rises of 2007 and 2008 were an unsustainable bubble.  He is the author of numerous books and scholarly articles on international relations and energy topics.  He was a co-founder of PFC Energy, a Washington-based energy consultancy group.

Lou Pai: Lou Lung Pai () born in Nanjing, China in 1947, is a Chinese-American businessman and former Enron executive.  He was CEO of Enron Energy Services from March 1997 until January 2001 and CEO of Enron Xcelerator, a venture capital division of Enron, from February 2001 until June 2001.  He left Enron with over $280 million.  Pai was the second largest land owner in Colorado after he purchased the 77500 acre Taylor Ranch for  million in 1999, though he sold the property in June 2004 for  million.

Supporting paragraphs: Lou Pai Enron
Answer: Enron