What Is a Demand Charge and Why Is It on Your Bill?

If you have ever looked at your commercial electricity bill and wondered why it is so much higher than the per-kWh rate would suggest, there is a good chance the answer is demand charges. For many Texas businesses, demand charges account for 30% to 70% of the total electricity bill — yet most business owners have never heard of them until they see the number.

This guide explains what demand charges are, how they are calculated, why they exist, and what you can do to manage them.


Energy Charges vs. Demand Charges

Your commercial electricity bill has two main components, and understanding the difference between them is essential:

Energy charges measure how much total electricity you consumed during the billing period. This is the per-kilowatt-hour (kWh) rate that most people focus on. If you used 50,000 kWh in a month at $0.08/kWh, your energy charge is $4,000. This is the volume of electricity you consumed.

Demand charges measure the highest rate at which you consumed electricity at any single point during the billing period. This is measured in kilowatts (kW), not kilowatt-hours. It reflects the peak load your building placed on the grid — the maximum amount of power you drew at one time. If your peak demand was 200 kW and your demand rate is $10/kW, your demand charge is $2,000.

Think of it this way: energy charges are like paying for the total gallons of water you used in a month. Demand charges are like paying for the size of the pipe needed to deliver water at your peak usage moment. Even if you only turned on every faucet simultaneously for fifteen minutes, you still needed that large pipe — and you pay for it.


How Demand Charges Are Calculated

Your TDU (Transmission and Distribution Utility) measures your electricity usage in 15-minute intervals throughout the billing period. At the end of the month, they identify the single 15-minute interval where your average power draw was highest. That peak — measured in kilowatts — becomes your billed demand for the month.

Here is a concrete example. Suppose your business operates a restaurant. For most of the day, your kitchen equipment, HVAC, and lighting draw about 80 kW. But during the Friday dinner rush, the kitchen runs every piece of equipment simultaneously, the dining room lights are at full brightness, and the HVAC is fighting the heat from the kitchen — your load spikes to 180 kW for about 45 minutes.

Your billed demand for the entire month is 180 kW, even though you only hit that level for a brief period. If your demand rate is $12/kW, that spike alone adds $2,160 to your bill — roughly the same as running at 80 kW for the entire month would cost in demand charges ($960).



This is why demand charges feel disproportionate. A single peak event — even one lasting just 15 minutes — sets your demand charge for the entire billing cycle.


Your demand charge is set by your single highest 15-minute peak in the billing period — not your average usage.

Why Do Demand Charges Exist?

Demand charges are not arbitrary. They reflect a real cost that the grid incurs to serve your business. The electrical infrastructure — transformers, substations, distribution lines — must be sized to handle your peak load, not your average load. If your business can draw 200 kW at peak, the grid must have the capacity to deliver 200 kW at a moment's notice, even if you typically only use 80 kW.

Building and maintaining that infrastructure costs money regardless of whether you use it every day or once a month. Demand charges are how the TDU recovers the cost of reserving that capacity for your business. The higher your peak, the more infrastructure is needed, and the more you pay.


This is also why demand charges are typically assessed by the TDU (as delivery charges) rather than by your REP. Some REPs also include their own demand component in the energy supply portion of your bill, but the largest demand charges come from the delivery side.


Which Businesses Are Most Affected?

Demand charges hit hardest when there is a big gap between your average usage and your peak usage. Industries with "peaky" load profiles pay proportionally more in demand charges:

  • Restaurants — Kitchen equipment creates massive spikes during meal rushes. A restaurant might average 60 kW but peak at 150+ kW during dinner service.
  • Manufacturing facilities — Starting heavy machinery creates brief but intense demand spikes. A single large motor starting up can spike demand by 50-100 kW for just a few minutes.
  • Hotels — Morning routines (simultaneous showers, breakfast cooking, HVAC ramp-up) create predictable daily peaks.
  • Cold storage and warehouses — Refrigeration compressors cycling on simultaneously can spike demand significantly above the facility's average draw.
  • Healthcare facilities — Medical equipment, sterilization systems, and HVAC requirements create high peak-to-average ratios.

Businesses with flat, consistent load profiles — like data centers or facilities that run 24/7 at steady output — tend to have lower demand charges relative to their total bill because their peak is not much higher than their average.


How to Reduce Your Demand Charges

Since demand charges are based on your single highest peak, the strategy is straightforward: flatten your load profile. Reduce the gap between your peak and your average. Here are practical approaches:

Stagger Equipment Startup

The most common cause of unnecessary demand spikes is turning on multiple pieces of heavy equipment simultaneously. If your business opens at 6 AM and every HVAC unit, compressor, oven, and lighting system kicks on at 6:00, you create an artificial peak that sets your demand charge for the month. Instead, stagger startups over 15-30 minutes. Start HVAC first, then lighting, then kitchen equipment. This simple change can reduce peak demand by 15-25% with zero impact on operations.

Pre-Cool or Pre-Heat Your Building

If your HVAC is your biggest load, consider running it during off-peak hours to pre-condition the space. Cooling your building gradually overnight (when demand charges are not being measured against peak pricing) reduces the HVAC load during business hours when other equipment is also running.

Monitor Your Demand in Real Time

You cannot manage what you do not measure. Many commercial meters and energy management systems can show you real-time demand. Some will even alert you when you approach a threshold, giving you time to shed non-critical loads before a new peak is set. Even basic interval data from your TDU (available through your online account) can reveal when your peaks occur and what is causing them.

Evaluate Your Load Factor

Load factor is the ratio of your average demand to your peak demand. A high load factor (close to 1.0) means you use power consistently. A low load factor means you have big peaks relative to your average. Improving your load factor — by flattening peaks and filling valleys — directly reduces the demand charge portion of your bill. Our expert guide on load factor explains how to calculate and improve this metric.


Real-time demand monitoring helps businesses identify and prevent costly peaks before they are set.

Demand Charges and Your Contract Choice

Understanding demand charges also affects which rate structure works best for your business. If demand charges are a large percentage of your bill, focusing exclusively on the per-kWh energy rate is a mistake — you could negotiate the lowest energy rate in the market and still have a massive bill because of demand.

Some REPs and commercial electricity contract structures handle demand charges differently. A few include demand in their all-in rate (effectively averaging it into the per-kWh price), while others break it out separately. When comparing contracts, always ask how demand is treated and compare total cost, not just the energy component.

For businesses with high demand charges, the most impactful savings often come from operational changes (load management, equipment scheduling) rather than from switching REPs or negotiating a lower energy rate. An energy broker can help identify which approach delivers more savings for your specific situation. A 10% reduction in peak demand through better load management can save more than a 5% reduction in your per-kWh energy rate.


The Bottom Line

Demand charges are one of the most misunderstood — and most expensive — components of a commercial electricity bill. They reward consistent usage and penalize peaks. Understanding how they work gives you a powerful lever for reducing your electricity costs that most businesses never think to pull.



Start by pulling your last three electricity bills and identifying the demand charge line items. Our guide to when to renew your contract covers how timing affects total cost. Compare your peak demand to your average usage. If there is a significant gap, you likely have room to reduce your bill through operational changes alone — before you even start shopping for a new rate.


May 9, 2026
Timing is everything in the Texas electricity market. The difference between renewing your commercial electricity contract at the right time versus the wrong time can amount to tens of thousands of dollars over the life of your agreement. Yet most Texas businesses treat contract renewal as an afterthought — something they deal with reactively rather than strategically. In a deregulated market like ERCOT , you have the power to choose your supplier and negotiate your terms. But that power is only useful if you exercise it at the right moment. This guide explains exactly when and how to approach your commercial electricity contract renewal for maximum savings. Know Your Contract End Date This sounds obvious, but it is the number one reason businesses overpay for electricity. The majority of commercial customers we work with do not know when their current electricity contract expires until it is too late. When your contract ends without a new agreement in place, one of two things typically happens — and neither one is good for your business: Auto-renewal at a holdover rate. Some contracts include a provision that automatically rolls you into a new term, but at a significantly higher rate. These holdover rates are rarely competitive — they are set by the REP without any negotiation, and they can be 20-50% above market rates. Month-to-month variable pricing. Without a contract in place, you default to a month-to-month variable rate that fluctuates with the wholesale market. This means you have no price protection during peak demand periods when electricity is most expensive. Both scenarios cost you money, and both are entirely avoidable. The fix starts with one simple action: find out when your current contract ends and put that date on your calendar — with a reminder set 120 days in advance. The 3-4 Month Rule The single most important tactical advice for contract renewal is this: start shopping 90 to 120 days before your contract expires. There are several reasons this timeline works: Forward pricing availability. Electricity suppliers offer forward pricing — rates locked in today for a future start date. These forward offers are typically available 30 to 120 days out. Starting early gives you access to the widest range of forward pricing options. Competitive leverage. When suppliers know you are shopping well in advance, they compete harder for your business. A business that calls one week before contract expiration has limited leverage because the supplier knows you are under time pressure. Time to compare. Evaluating bids from multiple suppliers takes time. You need to compare not just the headline rate, but the contract terms, fee structures, pass-through mechanisms, and early termination provisions. Our guide to fixed vs. variable rate electricity breaks down each option. Rushing this process leads to overlooked details that cost money. Market flexibility. Starting early means you can watch the market for favorable pricing windows. If rates are trending down, you can wait a few weeks. If rates are about to spike (heading into summer, for example), you can lock in before the increase. The Renewal Timeline 120 days out: Begin gathering your usage data and contacting brokers or suppliers. 90 days out: Review competitive bids and compare options. 60 days out: Finalize your selection and execute the contract. 30 days out: Confirm the switch is on track with your new supplier and ERCOT. Market Timing: When Are Texas Electricity Prices Lowest? The Texas electricity market follows predictable seasonal patterns driven largely by weather and natural gas prices. Understanding these patterns can help you time your contract renewal for the best possible rates. Generally, the best time to lock in a commercial electricity rate in Texas is between October and March. During this window, electricity demand is lower (mild weather means less HVAC load), natural gas prices — which drive the marginal cost of electricity generation in Texas — tend to be more stable, and suppliers are more willing to offer competitive forward pricing to secure volume for the coming year. Conversely, the most expensive time to sign a contract is during the summer months, particularly June through August. Wholesale prices are elevated due to peak cooling demand, and suppliers price their forward contracts to reflect the risk of extreme heat events. If you lock in a 24- or 36-month contract at summer peak pricing, you are paying an inflated rate for the entire term — not just the summer months. Timing your contract renewal to coincide with lower market periods can save your business thousands over the contract term. That said, the "best time" is a general guideline, not a guarantee. Unusual weather patterns, natural gas supply disruptions, changes in generation capacity, and regulatory developments can all move prices outside of their typical seasonal ranges. This is why ongoing market monitoring matters — and why working with a professional who tracks these factors daily is so valuable. Watch the Calendar, Not Just the Market Beyond general seasonal trends, several specific calendar events and market factors can significantly impact electricity pricing in Texas: ERCOT capacity and reserve margin reports. ERCOT publishes seasonal assessments of expected generation capacity versus demand. When reserve margins are tight — meaning the grid has less cushion between available supply and expected demand — forward prices tend to rise as suppliers price in the higher risk of scarcity events. Hurricane season (June-November). Gulf Coast hurricanes can disrupt natural gas production and electricity transmission infrastructure. The mere forecast of an active hurricane season can push forward prices higher as suppliers hedge against potential supply disruptions. Planned generation outages. Power plants schedule maintenance during lower-demand periods, but the timing and duration of these outages affects available supply. When multiple plants are offline simultaneously, prices can rise even during typically mild periods. Natural gas market movements. Since natural gas is the primary fuel for Texas electricity generation, significant movements in the Henry Hub benchmark directly impact electricity forward pricing. A cold winter that drives up natural gas demand nationally can raise Texas electricity prices even before summer arrives. Tracking all of these factors yourself is a full-time job. This is one of the core services an energy broker provides — continuous market monitoring so that when it is time to renew your contract, you are making a decision based on current conditions, not last month's assumptions. Early Termination: When It Makes Sense to Break a Contract Sometimes the smartest move is not waiting for your contract to expire — it is getting out early. If market rates have dropped significantly below your current locked-in rate, paying the early termination fee (ETF) and signing a new contract at lower rates can actually save you money over the remaining term. Here is how to evaluate whether early termination makes financial sense: Calculate your remaining cost. Multiply your current rate by your expected consumption for the remaining months of your contract. This is what you will pay if you stay. Get current market pricing. Obtain competitive bids for a new contract covering the same remaining period. Calculate what you would pay at the new rate. Add the ETF. Your current contract specifies the early termination fee — typically a per-kWh charge multiplied by your remaining expected usage, or a flat dollar amount. Compare totals. If the new contract cost plus the ETF is less than the cost of staying on your current contract, early termination is the financially rational choice. This calculation is straightforward in principle, but the details matter. Some ETFs are structured to decrease over the contract term, making termination more attractive as you approach expiration. Others have minimum charges that make early termination prohibitively expensive regardless of market conditions. An experienced broker can run these numbers for you and tell you exactly where the break-even point is. How a Broker Helps With Contract Renewals The businesses that consistently get the best electricity rates in Texas are not the ones who happen to get lucky with timing. They are the ones who have a professional managing their energy procurement on an ongoing basis. Here is what a good energy broker does for you around contract renewal: Tracks your contract dates. You do not need to set calendar reminders or dig through filing cabinets to find your contract terms. Your broker knows exactly when every agreement expires and starts the renewal process at the optimal time. Monitors market conditions. Instead of checking electricity prices yourself (which most business owners have neither the time nor the expertise to do meaningfully), your broker is watching daily market movements and will advise you on when conditions favor locking in a rate. Solicits competitive bids. Rather than calling individual REPs one at a time, your broker sends your usage profile to 25+ suppliers simultaneously, generating a competitive bidding environment that drives prices down. Reviews contract terms. The headline rate is only part of the picture. Your broker reviews the full contract for unfavorable terms, hidden fees, pass-through mechanisms, and termination provisions that could cost you down the line. Provides continuity. Your broker retains your historical usage data, knows your business's energy profile, and understands your preferences from previous renewal cycles. This institutional knowledge means each renewal is more efficient and better tailored than the last. All of this comes at no cost to your business — the broker is compensated by the supplier, not by you.  A broker manages the entire renewal process — from market monitoring to contract execution — so you can focus on running your business. Take Control of Your Next Renewal Your commercial electricity contract is one of the largest controllable expenses in your business. Treating renewal as a strategic decision rather than an administrative task can save you thousands of dollars every year. The key principles are simple: know your contract end date, start shopping 90-120 days early, time your renewal to avoid peak market periods, and work with a professional who monitors the market and negotiates on your behalf. For more ways to reduce costs, see our guide to lowering commercial electricity bills . Businesses that follow this approach consistently pay less for electricity than those who let contracts auto-renew or wait until the last minute. If you do not know when your current contract expires, that is the first thing to fix.
May 9, 2026
Texas is one of the few states in the country with a fully deregulated electricity market. That means businesses operating within the ERCOT grid have the freedom to choose their Retail Electric Provider (REP) — a significant advantage that can translate into real savings on one of your largest operating expenses. But freedom of choice comes with complexity. There are more than 25 licensed REPs serving the Texas commercial market, each offering dozens of plans with varying rate structures, contract terms, and fee schedules. Navigating this landscape on your own is time-consuming, and without market expertise, it is easy to leave money on the table. That is why a growing number of Texas businesses — from single-location restaurants to multi-site industrial operations — work with energy brokers rather than going directly to providers. What Does an Energy Broker Actually Do? An energy broker acts as an intermediary between your business and multiple electricity suppliers. Rather than you contacting each REP individually to request pricing, your broker handles the entire process on your behalf. Here is how it typically works: The broker collects your usage data. This includes your historical consumption (usually 12 months of usage history), your current rate and contract terms, your meter information, and your TDU service area. The broker solicits competitive bids. Using your usage profile, the broker requests pricing from multiple suppliers simultaneously. This creates a competitive bidding environment — suppliers know they are competing against each other, which drives prices down. The broker presents your options. You receive a side-by-side comparison of bids from multiple suppliers, including the rate per kWh , contract length, rate structure ( fixed, variable, or hybrid ), and any fees or special terms. You choose. The broker explains the options and makes recommendations based on your business's needs, but the final decision is always yours. The broker manages the transition. Once you select a supplier, the broker handles the contract execution and coordinates with ERCOT for the switch. There is no interruption to your service.  The most important thing to understand is that the broker is paid by the supplier, not by you. REPs build a small commission into their pricing to compensate the broker. This is the same commission structure that exists whether you go through a broker or not — when you go direct, the REP's internal sales team earns that same margin. Using a broker does not add cost to your bill.
May 9, 2026
When most Texas business owners think about their electricity cost, they think about one number: the per-kWh rate. That number represents energy charges — what you pay for the volume of electricity you consume. But hidden beneath that headline rate is a second, often larger cost component that most businesses never scrutinize: capacity charges. These charges — which show up as demand charges , transmission demand fees, and various per-kW assessments — pay for the grid's ability to deliver power at your peak consumption level, regardless of how much total energy you use. Understanding the fundamental difference between energy and capacity costs is essential for commercial electricity buyers who want to move beyond surface-level rate shopping and actually control their total cost of power. This guide breaks down both cost components in depth, explains how each is calculated, identifies the trends driving each component, and provides strategies for managing both. The Fundamental Distinction Every dollar on your commercial electricity bill ultimately pays for one of two things: Energy Costs: Paying for Fuel and Generation Energy charges pay for the actual electricity you consume — the kilowatt-hours (kWh) that powered your lights, HVAC, equipment, and operations during the billing period. These charges reflect the cost of generating electricity: the fuel (natural gas, wind, solar), the operating costs of power plants, and the wholesale market dynamics that determine the price at which generators sell their output. Energy charges are volumetric — they scale directly with how much electricity you use. If you use twice as much electricity, your energy charges roughly double. If you shut down for a week, your energy charges drop proportionally. On your bill, energy charges typically appear as: Energy charge (per kWh) from your REP TDU energy delivery charge (per kWh) from your TDU Fuel factor or energy pass-through charges (on some contract structures)  Capacity Costs: Paying for Infrastructure and Readiness Capacity charges pay for the grid's ability to deliver power at the rate you need it — measured in kilowatts (kW) of peak demand. These charges cover the physical infrastructure (transformers, substations, distribution lines, transmission towers) that must be sized to handle your maximum draw, the generation capacity that must be available to serve peak system-wide demand, and the ancillary services that keep the grid stable. Capacity charges are demand-based — they scale with the highest rate at which you consume electricity at any point during the billing period, not the total volume you consume. Two businesses can use the exact same total kWh in a month but pay dramatically different capacity charges if one draws power steadily and the other draws it in sharp peaks. On your bill, capacity charges typically appear as: TDU demand charge (per kW) — often the largest single capacity-related line item Transmission demand charge (per kW) — covering high-voltage transmission infrastructure REP demand charge (per kW) — some contracts include a supply-side demand component Coincident peak (4CP) charges — based on your usage during ERCOT system peak periods Capacity obligation or ancillary service charges — covering grid reliability requirements
May 9, 2026
Restaurants are among the most energy-intensive businesses in the commercial sector. Between commercial kitchen equipment running at full capacity during service, walk-in coolers and freezers operating around the clock, HVAC systems battling Texas heat, and hood ventilation fans that never stop, electricity is often the second-largest operating expense for Texas restaurants — right behind labor. Our restaurants and food industry page covers how we help operators across the state. The good news is that operating in ERCOT's deregulated electricity market means you have options. Unlike states where a single utility dictates your rate, Texas restaurant operators can choose their commercial electricity supplier, negotiate their contract terms, and implement operational strategies that directly reduce what they pay. This guide covers the practical, high-impact actions you can take to bring those electricity costs down. Why Restaurant Electricity Bills Are So High Before you can fix the problem, it helps to understand why restaurants use so much electricity compared to other commercial businesses of similar size. The answer comes down to two factors: total consumption and peak demand. On the consumption side, restaurants operate energy-hungry equipment for extended hours: Walk-in coolers and freezers run 24 hours a day, 7 days a week. These are the baseline of your electricity usage, drawing power even when the restaurant is closed. Commercial ovens, fryers, and grills consume massive amounts of electricity during prep and service. A single commercial convection oven can draw 10-15 kW. HVAC systems work overtime in Texas, especially from May through September. The kitchen generates significant heat, so your cooling system is not just fighting outdoor temperatures — it is fighting the heat your own equipment produces. Hood ventilation systems are required by code to run whenever cooking equipment is in operation, and they pull conditioned air out of the building, forcing the HVAC to work harder. Lighting, POS systems, dishwashers, and ice machines round out a substantial base load that runs through every shift. All of this equipment running simultaneously is what drives the second factor — peak demand — which is where the real cost pain point lies for most restaurants.
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