AMENDED EXHIBIT "A" To The GAS PURCHASE CONTRACT As Of: October 1, 1994 Between CASCADE NATURAL GAS CORPORATION ("BUYER") and IGI RESOURCES, INC. ("SELLER")

QuickLinks -- Click here to rapidly navigate through this document

Exhibit 10.21.2

AMENDED
EXHIBIT "A"

To The

GAS PURCHASE CONTRACT

As Of: October 1, 1994

Between

CASCADE NATURAL GAS CORPORATION ("BUYER")

and

IGI RESOURCES, INC. ("SELLER")

Effective Date of this Exhibit "A":  October 1, 2002

Ending Date of this Exhibit "A":  March 31, 2003

---

1.

The Delivery Point Selling Price shall be equal to four dollars and sixty eight cents ($[*]U.S. dry) per MMBtu at AECO-C Hub plus the actual cost of firm NOVA re-delivery service and firm ANG receipt and re-delivery service plus any applicable allowance for fuel-in-kind associated with such services.

[*] = Confidential Information

		"BUYER" CASCADE NATURAL GAS CORPORATION
		By:		/s/ King ▇▇▇▇▇
		Name:		King ▇▇▇▇▇
		Title:		Vice President, Gas Supply
		"SELLER" IGI RESOURCES, INC.
		By:		/s/ ▇▇▇▇▇ ▇▇▇▇▇▇▇
		Name:		▇▇▇▇▇ ▇▇▇▇▇▇▇
		Title:		President

---

QuickLinks

Exhibit 10.21.2

AMENDED EXHIBIT "A" To The GAS PURCHASE CONTRACT As Of: October 1, 1994 Between CASCADE NATURAL GAS CORPORATION ("BUYER") and IGI RESOURCES, INC. ("SELLER")