Commercial and Industrial (C&I) energy bills are based on various components that cumulatively determine the total cost of purchasing energy. To effectively manage and potentially reduce energy costs, it's essential to understand some of the key aspects of C&I energy bills. We will discuss common terms and highlight how energy storage systems can support strategies for Time of Use (TOU) and Demand Response (DR).
Demand charges
A demand charge on an electricity bill is a fee based on the highest level of electricity usage within a specific period, typically measured in kilowatts ($/kW). It is separate from the standard usage charges and reflects the maximum amount of power drawn from the grid during peak times. Essentially, it accounts for the cost of ensuring the capacity to meet a consumer’s highest electricity demand, encouraging consumers to manage their peak power usage to minimize this additional fee.
Rate schedules
These are structured frameworks for determining electricity costs for C&I clients. Utilities offer various schedules, which significantly impact costs. Understanding your business's specific rate schedule is crucial, as it influences demand and energy charges.
Energy charges
These charges are based on actual electricity consumption (measured in kWh). C&I clients might be billed using time-of-use rates, meaning costs vary based on time of day, with off-peak hours generally being cheaper.
Off-peak electricity hours are times when electricity demand and usage are at their lowest. This typically corresponds with lower electricity prices. These hours can vary depending on your location and utility company, but they are often aligned with the times when most people are out of the house for work or school. Generally, for many areas, off-peak hours are late night to early morning, often from 9 or 10 P.M. until 6 or 7 A.M. Midday may also see off-peak rates, especially in regions where solar energy production is high.
To determine the specific off-peak hours for your region, it's best to consult your local utility company's website or customer service. They will provide the most accurate and current information relevant to your area. Keep in mind that these off-peak hours typically apply to weekdays, as energy usage patterns can be quite different on weekends.
Power factor
The metric called Power Factor indicates the efficiency of electrical power conversion into useful work output. A low power factor can lead to penalties and higher costs for C&I clients, who can improve it by installing power factor correction equipment. Equipment that is compatible with varying voltage applications comes with fixed and automatic switched capacitors that will raise the facility's power factor to meet utility requirements and remove high-priced utility charges.
We find that electric utility costs are influenced by a site's load magnitude and shape and its utility bill structure, with rate structures growing increasingly complex. For instance, a site's rate is typically based on delivered voltage, and smaller sites often receive lower voltage. In deregulated states, businesses can choose their electric supply provider, which can affect the billing structure and overall costs and come with its own risks and rewards.
By comprehensively understanding these components, C&I clients can make informed decisions to optimize their electricity costs, leveraging their knowledge of rate schedules, demand patterns, and power factor efficiencies.