2. 5/10/07

3. Pipeline CO2 Spec Columbia Gas1.25 ANR Pipeline2.00 Panhandle Eastern2.00 Texas Eastern3.00 Tennessee3.00 Rockies Express Northern Natural Another Pipeline Going out of Sync with the Grid Northern Natural proposing to seasonally change CO2 to 1% from 2% Pipeline CO2 Spec Colorado Interstate Gas 3.00 Wyoming Interstate Company 3.00 Questar Pipeline Company 3.00* TransColorado Gas Transmission 2.00 Cheyenne Plains Pipeline 3.00 Rockies Express 2.00 *no CO2 spec, spec is total inerts

6. Supply and Capacity Perspective (Bcfd) Northwest0.66 Kern2.14 TransColorado0.61 CIG0.60 Cheyenne Plains0.84 Southern Star0.19 KMI (including PE)0.40 Trailblazer0.85 WBI0.3 TOTAL6.59 Green River2.70 Uintah0.70 Piceance0.85 Wind river0.45 DJ0.64 Wamsutter0.75 PRB1 TOTAL7.09 Denver0.51 SLC0.250.5 Shoulder 0.75 Average Winter Day 1.50

7. What about mid-continent? ANR PEPL NGPA NNG

8. Max Delivery2.6 Bcfd Max Inject1.3 Bcfd

10. Fundamentals, outages, and infrastructure constraints have pronounced affects on recent Rockies gas prices