(revised)Top North American Gas Marketers (Bcf/d)

Company

2Q2007

2Q2006

Change

ConocoPhillips

13.50

14.20

-5%

Shell Energy NA

12.60

11.70

8%

Sempra

11.90

11.60

3%

Chevron

8.80

7.30

21%

Constellation

8.20

7.40

11%

UBS

5.10

5.10

0%

Louis Dreyfus

5.02

5.03

-0%

Nexen

4.90

5.50

-11%

Tenaska

4.50

3.80

18%

EnCana

3.51

3.36

4%

Oneok

2.80

2.80

0%

ExxonMobil

2.30

2.50

-8%

Devon

2.30

2.20

5%

Sequent

2.00

2.10

-5%

Anadarko

1.80

1.09

65%

Merrill Lynch

1.76

2.00

-12%

Chesapeake

1.72

1.57

10%

Canadian Natural

1.70

1.50

13%

Calpine

1.60

1.40

14%

Hess

1.60

1.70

-6%

Enserco

1.53

1.46

5%

CenterPoint Energy

1.30

1.30

0%

XTO

1.30

1.20

8%

El Paso

1.20

1.20

0%

Total

102.64

99.01

4%

Source: Quarterly financial reports with the Securities and Exchange Commission, or if necessary, statements signed by company officials and provided to NGI.

Companies providing data directly to NGI include ConocoPhillips, Constellation Energy Commodities Group, Louis Dreyfus Highbridge Energy, Merrill Lynch Commodities, Shell Energy North America, Tenaska Marketing Ventures and UBS Energy. Fortis, which bought the Duke/Cinergy marketing arm, did not provide physical gas sales figures. Cinergy reported 5.05 Bcf/d in gas sales in 2Q2006. BP plc, which resumed reporting to this survey for 4Q2007, is believed to be the largest North American Gas Marketer by a wide margin.