AISS RATE SCHEDULE
ADVANCED INTERRUPTIBLE STORAGE SERVICE
   
1.     AVAILABILITY
This AISS Rate Schedule is available to any Customer for the purchase of
advanced interruptible natural gas storage service from Caledonia, provided
that:
   
(a)     Caledonia has determined that it has sufficient operationally
available storage, injection and withdrawal capacity to perform service
requested by Customer;
   
(b)     Caledonia has determined that service requested by Customer will not
interfere with efficient operation of its system or with service to firm
storage customers;
   
(c)     Customer and Caledonia have executed an Advanced Interruptible Storage
Service Agreement under this AISS Rate Schedule (AISS Service
Agreement);
    
(d)     Customer accepts responsibility for arranging any transportation
service required for utilization of the storage service provided under this
AISS Rate Schedule;
   
(e)     Customer satisfies the creditworthiness criteria in accordance with
Sections 3 and 24 of the General Terms and Conditions; and
   
(f)     Service under this AISS Rate Schedule may not be available to the
extent that Caledonia would be required to construct, modify, expand or
acquire any facilities to enable Caledonia to perform the requested
services.
   
2.     APPLICABILITY AND CHARACTER OF SERVICE
(a)     Service provided under this AISS Rate Schedule, including all
injections into and withdrawals from storage shall have the priority specified
in Sections 4.1 through 4.4 of the General Terms and Conditions or otherwise
to the extent provided in this AISS Rate Schedule.
   
   
(b)     Subject to the limitations and requirements set forth in this Rate
Schedule and in Customer s AISS Service Agreement, Customer shall be permitted
to request Caledonia to:
   
     (i)     Inject, on an interruptible basis, quantities received by
Caledonia from or on behalf of Customer and designated by Customer for
injection to "AISS Storage," up to the Customer s Maximum Advanced
Interruptible Storage Capacity (MAISC) on a daily basis not to exceed the
Maximum Daily Injection Quantity (MDIQ), as limited by the ADIQ set forth in
Exhibit A of Customer s AISS Service Agreement, less sufficient quantities for
Fuel Reimbursement.
   
     (ii)     Deliver to Customer, on an interruptible basis, thermally
equivalent quantities of Gas, up to the Maximum Daily Withdrawal Quantity
(MDWQ), as

AISS RATE SCHEDULE
ADVANCED INTERRUPTIBLE STORAGE SERVICE
   
1.     AVAILABILITY
This AISS Rate Schedule is available to any Customer for the purchase of
advanced interruptible natural gas storage service from Caledonia, provided
that:
   
(a)     Caledonia has determined that it has sufficient operationally
available storage, injection and withdrawal capacity to perform service
requested by Customer;
   
(b)     Caledonia has determined that service requested by Customer will not
interfere with efficient operation of its system or with service to firm
storage customers;
   
(c)     Customer and Caledonia have executed an Advanced Interruptible Storage
Service Agreement under this AISS Rate Schedule (AISS Service
Agreement);
    
(d)     Customer accepts responsibility for arranging any transportation
service required for utilization of the storage service provided under this
AISS Rate Schedule;
   
(e)     Customer satisfies the creditworthiness criteria in accordance with
Sections 3 and 24 of the General Terms and Conditions; and
   
(f)     Service under this AISS Rate Schedule may not be available to the
extent that Caledonia would be required to construct, modify, expand or
acquire any facilities to enable Caledonia to perform the requested
services.
   
2.     APPLICABILITY AND CHARACTER OF SERVICE
(a)     Service provided under this AISS Rate Schedule, including all
injections into and withdrawals from storage shall have the priority specified
in Sections 4.1 through 4.4 of the General Terms and Conditions or otherwise
to the extent provided in this AISS Rate Schedule.
   
   
(b)     Subject to the limitations and requirements set forth in this Rate
Schedule and in Customer s AISS Service Agreement, Customer shall be permitted
to request Caledonia to:
   
     (i)     Inject, on an interruptible basis, quantities received by
Caledonia from or on behalf of Customer and designated by Customer for
injection to "AISS Storage," up to the Customer s Maximum Advanced
Interruptible Storage Capacity (MAISC) on a daily basis not to exceed the
Maximum Daily Injection Quantity (MDIQ), as limited by the ADIQ set forth in
Exhibit A of Customer s AISS Service Agreement, less sufficient quantities for
Fuel Reimbursement.
   
     (ii)     Deliver to Customer, on an interruptible basis, thermally
equivalent quantities of Gas, up to the Maximum Daily Withdrawal Quantity
(MDWQ), as