The set of operational, physical and market interconnections between electrical power systems and natural gas networks (including gas-fired generation, gas-fired boilers, compressors and market mechanisms) such that flows, availability, prices and failures in one network materially affect the other’s ability to meet demand, provide balancing and maintain reliability.

Principle

Gas-fired assets provide dispatchable electricity and thus couple gas network supply and pressure dynamics to electrical balancing; reciprocally, electricity is required to operate gas infrastructure (compressors, control systems). Therefore, constraints or shocks in one network (supply shortfalls, price spikes, outages) propagate through coupled dispatch and operational dependencies into the other.

Demonstration

Illustrative scenario — Situation: During a prolonged cold snap residential gas demand rises, reducing gas available for power plants. Recognition: Grid operators observe lower online gas-fired generation than scheduled. Action: Operators re-dispatch remaining thermal and renewable units and apply demand‑reduction measures; gas network operators implement priority allocation rules. Consequence: Electricity margins tighten, prices rise, and coordinated operational procedures determine which loads are shed and which gas demands are prioritized.

Misapplication

Assuming the gas network functions as an unlimited buffer for electricity (i.e., that gas-fired generation can always ramp immediately). The error overlooks pipeline capacities, low‑pressure constraints, linepack limits and timing of gas deliverability versus electrical ramping needs.

Consequence

Coupling produces mutual dependencies: it can enhance short-term flexibility of power systems but also creates joint failure modes, amplifies systemic risk during concurrent stress (e.g., cold events), necessitates coordinated market products and operational procedures, and motivates investments in storage, fuel diversification or electrification to reallocate risk.

Reversal

As gas network flexibility is supplemented by non‑gas options (large‑scale electricity storage, demand response, hydrogen blending or synthetic fuels, or full electrification of heat), the operational tightness of electricity–gas coupling diminishes; conversely, increased reliance on gas generation without parallel flexibility measures intensifies coupling risks.

Boundary

Clearly within: Power systems where a significant share of dispatchable generation is gas-fired and gas pipelines supply power plants under linked contracts and operational coordination. Boundary case: Isolated peak gas plants used only seasonally with limited pipeline interaction. Clearly outside: Power systems with no connected gas network or with negligible gas-fired generation.

Semantic Tension

Decarbonization ↔ Security of Supply — gas provides flexible backup that supports integration of variable renewables (security), but continued reliance on gas can lock in fossil infrastructure and methane emission risk (decarbonization), creating a trade‑off in transition choices.

Synthesis

Electricity–gas coupling is an operational and market-level interdependence: it supplies valuable flexibility but transfers and concentrates risk across networks; managing it requires coordinated operational rules, investment in alternative flexibility (storage, demand response, fuel diversification) and careful transition planning to reconcile reliability with decarbonization goals.