Demand charges and load factor: how Texas facilities cut both
Demand charges are billed on peak kW, while energy charges are billed on total kWh. A low load factor means the peak is much higher than the average, inflating demand costs. By staggering equipment, shaving peaks, shifting loads, and using real‑time monitoring, Texas facilities can raise their load factor and cut both demand and energy bills.
Demand charges dominate the electricity bill for most Texas commercial sites, often accounting for 30‑45% of total spend. A low load factor—where peak demand far exceeds average consumption—exacerbates those charges and masks opportunities for savings. Facilities that align equipment start‑times, shave peaks, and shift non‑critical loads can improve load factor and reduce both demand and energy costs.
In Texas, demand charges are applied per kilowatt (kW) of the highest 15‑minute or 30‑minute interval recorded during the billing month, while energy charges are applied per kilowatt‑hour (kWh) consumed. Load factor, expressed as a percentage, is the ratio of average kW to peak kW. A low load factor means a costly load shape; a higher load factor spreads usage more evenly, lowering the per‑kW charge without changing total consumption.
Understanding demand and energy charges
Demand charges
ERCOT‑based retail electric providers (REPs) typically levy a demand charge ranging from $10 to $15 per kW, depending on the tariff and the Transmission and Distribution Service Provider (TDSP). The charge reflects the capacity the grid must reserve for the customer’s peak usage. Because the cost is fixed per kW, a single 5‑minute spike can drive a month’s demand bill.
Energy charges
Energy charges are billed in cents per kWh and track the total electricity consumed. In the Dallas‑Fort Worth market the average retail energy rate is about 8 cents/kWh, while in West Texas it can be closer to 6 cents/kWh. Energy rates are influenced by wholesale LMP (Locational Marginal Price) and the Electricity Facts Label, but they are generally less volatile than demand charges.
Load factor and its cost impact
Calculating load factor
Load factor = (Average kW ÷ Peak kW) × 100.
Average kW is derived from total monthly kWh divided by the total hours in the month. For a 30‑day month, 720 hours are used in the denominator.
Cost illustration
Consider a 100,000 kWh/month site with a peak demand of 500 kW.
- Average kW = 100,000 kWh ÷ 720 h ≈ 139 kW.
- Load factor = (139 ÷ 500) × 100 ≈ 27.8%.
If the demand charge is $12/kW, the monthly demand cost is 500 kW × $12 = $6,000. The energy cost at 8 cents/kWh is 100,000 kWh × $0.08 = $8,000. Total = $14,000, with demand representing 43% of the bill.
Improving the load factor to 45% (by reducing peak to 310 kW while keeping consumption constant) changes the numbers:
- New peak demand = 310 kW → demand cost = 310 kW × $12 = $3,720.
- Energy cost unchanged at $8,000.
- Total = $11,720, a $2,280 monthly saving or 19% reduction in total spend.
Practical strategies to improve load factor
Stagger equipment starts
Many Texas facilities run large compressors, HVAC units, or refrigeration systems on a single timer. Shifting start times by 5‑15 minutes spreads the load across the hour, flattening the peak. Simple PLC or building‑automation adjustments can achieve this without capital expense.
Peak shaving with storage or on‑site generation
Battery Energy Storage Systems (BESS) or natural‑gas‑fired generators can discharge during the 15‑minute interval that would otherwise set the peak. A 250 kW BESS, sized to cover the typical 10‑minute peak, can shave 250 kW off the recorded peak, directly reducing the demand charge.
Load shifting with time‑of‑use (TOU) rates
While most Texas tariffs are flat, some REPs offer TOU structures that add a higher demand component for specific “critical” hours (e.g., 12 pm‑6 pm). Shifting non‑essential processes to off‑peak windows (night or early morning) reduces the likelihood of hitting the critical‑hour peak.
Real‑time monitoring and targeting
A free Energy Health Check from United Power Group includes a bill review and TDSP delivery‑charge audit. Coupled with sub‑metering and a cloud‑based dashboard, facilities can see the exact kW curve, set alerts for approaching peak thresholds, and train operators to pause discretionary loads.
Worked example: a Texas distribution warehouse
Baseline profile
- Monthly consumption: 120,000 kWh.
- Recorded peak demand: 620 kW (15‑minute interval).
- Demand charge: $13/kW (typical for the region).
- Energy charge: 8 cents/kWh.
Baseline cost:
- Demand = 620 kW × $13 = $8,060.
- Energy = 120,000 kWh × $0.08 = $9,600.
- Total = $17,660.
Load factor = (120,000 ÷ 720) ÷ 620 ≈ 26.8%.
Implemented changes
- Staggered start of three 150 kW refrigeration units, reducing simultaneous draw by 150 kW.
- Installed 300 kW BESS programmed to discharge during the 12 pm‑2 pm peak window.
- Shifted packaging line from 2 pm‑4 pm to 10 pm‑12 am.
- Added real‑time alerts to pause non‑critical lighting when demand exceeds 500 kW.
Resulting peak demand: 420 kW.
Savings breakdown
- New demand cost = 420 kW × $13 = $5,460 (saving $2,600).
- Energy consumption fell 3% due to more efficient equipment sequencing, lowering energy cost to 116,400 kWh × $0.08 = $9,312 (saving $288).
- Total monthly cost = $5,460 + $9,312 = $14,772.
- Monthly savings = $2,888, or 16% of total spend.
- Annualized, the facility saves $34,656, contributing to the $3.2 M UPG‑wide yearly client savings.
Load factor improvement
New load factor = (116,400 ÷ 720) ÷ 420 ≈ 38.6%, up from 26.8%.
The higher load factor not only cuts demand charges but also positions the site to qualify for future incentive programs that reward efficient load shapes.
Bottom line
Demand charges are a fixed‑cost lever that Texas businesses cannot ignore. A low load factor magnifies those charges, but modest operational changes—staggered starts, targeted peak shaving, strategic load shifting, and real‑time monitoring—can raise the load factor, shrink peak demand, and deliver double‑digit savings. United Power Group’s free Energy Health Check can identify the specific opportunities for any facility, leveraging 25 years of Texas market expertise to achieve up to a 27% reduction in total energy spend.
Demand charges and load factor: how Texas facilities cut both — quick questions
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