Gas constraint definitions

Wisconsin Electric Gas Operations (WEGO)


Constraint Period

The period of time, following the company’s notification, as described in this tariff, that a constraint condition exists and extending until the company communicates to the customer that the constraint condition no longer exists. The constraint period rules, prices, and/or penalties of the company shall be applied to the affected parties only and shall not be deemed applicable to all demand aggregator pools, customers, or operating systems on a system-wide basis unless expressed by the company.

High Flow Constraint Period

A period of time when the distribution system is experiencing high demand for flowing gas quantities and one in which the company determines that the expected system demand may exceed the expected supplies being delivered to its city gate.

Low Flow Constraint Period

A period of time when the distribution system is experiencing low demand for flowing gas quantities and one in which the company determines that the expected system supply may exceed the expected demand. The transportation customers shall be required to use all gas quantities delivered to the city gate on their behalf.

Intra-Day Constraint

A constraint period called by the company after the start of the gas day of gas flow whereby the customer is notified that a constraint condition exists during that day of gas flow.

Level I Curtailment, Interruption, or Constraint Order

A Level I order is generally called when the distribution system’s operating conditions or the prevailing gas supply economics are such that natural gas supplies and demands, in the company’s opinion and sole discretion, must be aligned as closely as possible.

Level II Curtailment, Interruption, or Constraint Order

A Level II order is generally called when the distribution system, pipeline delivery system or other gas supply/distribution resources dictate, at the sole discretion and interpretation of the company, that it is critical that gas supply and demand be aligned, whether for system integrity, economics or safety reasons.

Level III Constraint Order

A Level III order is generally called when the distribution system, pipeline delivery system or other gas supply/distribution resources dictate, at the sole discretion and interpretation of the company, that it is more critical than under Level II that gas supply and demand be aligned, whether for system integrity, economics or safety reasons.

Level IV Constraint Order

A Level IV order is generally called when the distribution system, pipeline delivery system or other gas supply/distribution resources dictate, at the sole discretion and interpretation of the company, that it is more critical than under Level III that gas supply and demand be aligned, whether for system integrity, economics or safety reasons.

Maximum Hourly Delivery Quantity (MHDQ)

The maximum hourly rights a customer has to a gate or group of gates which is a function of the customer’s firm transportation contractual rights on all pipelines capable of serving its load within operating system plus any allocable hourly rights from company backup services.

Operational Flow Condition (OFC)

A period of time within an operating system or group of operating systems where end user transportation customer(s), demand aggregators and/or marketers shall be required to limit, on an hourly basis, their usage to their customer demand nomination prorated to an hourly basis per the rights of their underlying pipeline services used to deliver gas to the company’s city gate.

Penalty Level

Level I

Level II

Level III

Level IV

Penalty Application Quantity

Super Pooling Quantity for area(s) or customer(s) constrained.

Super Pooling Quantity for area(s) or customer(s) constrained.

By Pool within Operating system for area(s) or customer(s) constrained

By Pool within Operating system for area(s) or customer(s) constrained


Operating Systems (OS)

A contiguous geographic area of the company’s natural gas distribution system that can be serviced by one or more delivery point(s) on interstate pipeline(s). An operating system will remain at least as large as the smallest political district within the WISCONSIN ELECTRIC - GAS OPERATIONS franchise area.

Operating systems within the WISCONSIN ELECTRIC - GAS OPERATIONS distribution system, are identified by municipality on Schedule X-415, Operating Systems.

For further explanation of constraints conditions, please refer to Wisconsin Electric - Gas Operations tariff sheets.