Why Charlotte-area natural gas bills surged this winter, and what customers can check now

Cold-weather demand and rate differences are colliding on many household statements

Across the Charlotte region, some households that heat with natural gas have reported winter bills far above what they expected, in some cases running several hundred dollars higher than typical monthly totals. The pattern has been most visible after a stretch of severe winter weather that included prolonged freezing temperatures and back-to-back storms in the Carolinas.

Natural gas bills generally rise for two main reasons: customers use more fuel, or the price per unit of energy is higher (or both). Recent bills cited by customers show unusually high usage during the coldest periods, a factor that can outweigh conservation steps such as lowering thermostats, limiting space-heater use, or adjusting water-heater settings.

How the math works: therms, temperature gaps, and heating run-time

Residential natural gas is commonly billed per therm, a unit of heat energy. When outdoor temperatures drop, furnaces and boilers must run longer to maintain indoor setpoints. The larger the difference between outside temperature and thermostat setting, the more therms are typically needed over the billing cycle. In practical terms, even small thermostat increases can translate into sizable additional run-time during multi-day freezes.

Customers who normally see moderate winter usage can also experience outsized bills if cold air infiltration is high (drafty doors, attic bypasses, leaky ductwork) or if equipment is struggling (dirty filters, aging furnaces, improper combustion settings). Those conditions tend to show up as higher therm usage rather than a change in the per-therm price.

Why similar homes can see different bills: utility footprints and regulated charges

In the Charlotte-area market, customers may be served by different gas utilities depending on location. Utility service territories matter because delivery rates and fixed charges are set through separate regulatory proceedings, reflecting each company’s infrastructure needs, customer density, and operating costs.

Recent comparisons circulating in the region highlight meaningful differences in per-therm charges between providers and even between the same company’s service in different states. Piedmont Natural Gas has stated that its North Carolina service territory spans 66 counties and about 750,000 customers, including large rural areas that require extensive transmission and distribution infrastructure. Maintaining and expanding that network can affect delivery costs embedded in customer bills.

Separately, Piedmont Natural Gas reached an agreement tied to its North Carolina rate review that indicated an average residential impact of about $7.50 more per month beginning in November 2024, while also describing offsetting adjustments to certain pass-through cost components. For customers comparing bills year-over-year, that change can compound with higher winter usage.

What customers can review on their bill and account portal

• Usage versus price: Compare therms used this billing cycle to the same month last year; large increases in therms often explain most of the jump.

• Billing period length: A longer cycle can raise the total even if daily usage is unchanged.

• Fixed charges and riders: Note the customer charge and any trackers/adjustments that can change periodically.

• Budget billing options: Piedmont Natural Gas offers an Equal Payment Plan designed to smooth seasonal spikes by averaging expected annual costs, then reconciling the balance.

Households facing unusually high bills typically see the largest driver in total therm usage during extended freezes, with underlying delivery rates and fixed charges shaping the final total.

For residents experiencing recurring winter spikes, the most actionable next step is to confirm whether the increase is primarily higher therm consumption, then consider a home energy assessment, equipment servicing, or budget-billing enrollment to reduce volatility in future cold snaps.