Gas pipeline constraints and electricity: test the account-level exposure

Two networks, two different constraints

A natural gas pipeline moves fuel. Electric transmission moves electricity. A pipeline restriction can affect fuel available to a generator, but it is not the same event as an electric line outage or a retail supplier failure. Keeping these mechanisms separate prevents a procurement team from buying the wrong product in response to an infrastructure headline.

Start with the reported location and affected service. A restriction may concern interruptible transportation, a particular receipt point or an operational condition. Determine whether it affects the generator fleet relevant to the electric account. A restriction far from the account does not by itself prove that a power price will rise; physical connections, alternative fuel and market conditions matter.

Trace the commercial obligation

For gas transportation, identify who procures commodity, reserves transport, nominates deliveries and manages imbalance. For power, identify the relevant utility, supplier and agreement provisions. A fixed electric energy price does not establish a guarantee against physical outages, and a firm gas supply description does not automatically mean every upstream transport segment is firm.

Ask the responsible supplier for an explanation tied to the actual contract. Distinguish a price adjustment from a curtailment notice and an emergency instruction. Procurement staff should not override operating restrictions or attempt to manage a physical gas system through a pricing spreadsheet.

Worked example: separate a budget stress from an outage consequence

Hypothetical planning scenario: a facility expects 80 MWh of exposed electricity purchases during a constrained period. Its base scenario is $70/MWh and its stress scenario is $140/MWh. The modeled energy amounts are $5,600 and $11,200, a $5,600 difference. No probability is assigned to either price.

If the facility also assumes a four-hour interruption, that is a separate operating scenario. Lost production, safe shutdown, restart and backup operation cannot simply be added as an energy-rate multiplier. Do not count the same backup fuel cost both in the energy budget and again as an outage loss. Preserve the assumptions so the resilience team can review them separately.

Prepare three records before a constraint occurs

1. An exposure map: meter, supplier, product, variable components and contractual notice contact.
2. A continuity record: critical loads, safe shutdown authority, tested backup capabilities and utility emergency procedures.
3. A decision log: observation date, source, possible mechanism and the executable action being considered.

For a portfolio, group gas and electricity accounts separately in the multi-location planner. Do not combine therms with kWh or assume all locations share the same constraint. Refresh the map after supplier changes, equipment additions or site relocations.

Sources and limits

FERC natural gas resources provides the interstate gas regulatory starting point. Atmos Pipeline–Texas's service description illustrates transportation and storage as distinct services. Actual tariffs, notices and agreements control the specific account; the scenario above is original and does not describe a historical disruption.