If you are responsible for the power costs in a facility or your business, it’s normal to wonder whether operating a diesel generator is cheaper than grid costs. But how you use power, when you use it, and which costs you may incur during your operations will dictate the answer. Recognizing these elements enables you to make practical decisions.
Why Are Power Cost Comparisons Not Simple?
You cannot compare the power from diesel generator sets with grid electricity in a straightforward manner. This is because they have very different cost curves. You’re billed at regular intervals for grid electricity, whereas generators’ costs depend on the consumption of fuel, servicing, and operational hours.
When comparing them directly, you look beyond the price. You will also have to consider factors like how important reliability is, how interruptions could affect your business, and how often you’ll be using power while planning for backup power options. If you do all this, only then will the comparison become meaningful.
How Do You Pay for Grid Electricity?
When you draw energy from the grid, you pay for the energy consumed over time. Depending on your geographical area, your bill may include fixed charges, consumption charges, demand charges, and more.
If your operations run in peak periods, then the electricity cost increases a lot. In addition, certain tariffs impose penalties on high usage, regardless of duration. Thus, although grid power is easy to use, its tariff may not be favourable for operations that need more energy. Unfortunately, it’s also not good for time-critical operations too.
How Are Diesel Generator Costs Calculated?
Diesel generators don’t work in a billing model. You only pay for regular servicing, fuel, labor, and any costs that come with replacing parts. In short, the price of electricity will depend on the efficiency with which the generator converts fuel.
Also, remember that fluctuations in fuel prices will have an impact on the operating cost. Regarding the generator, its condition, quality of maintenance, and load level will matter for the amount of electrical energy you will get for every unit of fuel. A combination of these factors is the real reason why the costs of generators tend to fluctuate more than the grid electricity costs.
Energy Consumption and Load Behavior
The operating cost of a generator increases significantly due to fuel consumption. Generators don’t consume fuel according to their runtime. Instead, they do it according to their load. Thus, the fuel efficiency will drop if you run the generator with a significantly low load.
Conversely, the fuel usage of a generator becomes more efficient when it runs closer to its rated load. If you don’t plan the load properly, it leads to wastage of fuel and increases the effective cost of power generated. This explains why the sizing of generators and load management affect cost comparisons.
Comparing Unit Power Cost
If you want to compare the power of grid electricity with that of a diesel generator, you will need an accurate cost per unit. This will be visible on your bill. To compute the total operating cost for generator power, the total cost over a certain time period is divided by the total energy produced.
Electricity generated from diesel is, in many cases, more expensive per unit compared to grid electricity for continuous use. But this comparison will change when you consider the timing, reliability, and power loss cost.
Backup Power From Diesel Generators
Many people use diesel generators as backup. Here, cost comparisons will focus more on the continuity of operation rather than the price of energy.
When there’s production loss, safety concerns, or damage to the equipment due to a power failure, downtime costs can be far greater than the fuel cost. During these situations, the generator isn’t competing against grid electricity for the price only. In fact, it goes further than that and protects your business and operations from devastating financial losses.
Using Diesel Generators for Peak Demand Control
In some setups, diesel generators are used primarily to tackle busy hours. It lowers charges related to demand and mitigates peak load on the grid as well.
In such cases, you have to understand that despite its higher costs for every unit, generator power may ultimately be cheaper than peak energy charges. Thus, generators are not the most economical to use in full-time operation mode. Instead, you need to use it strategically.
How Do Usage Patterns Affect Cost
The way you operate will determine whether a diesel generator works better than electricity when considering the costs. As you already know, you will have an advantage if you use generators strategically for short periods. On the other hand, steady long-term operation will be better for grid power.
Using a generator can save you money if your site has occasional spikes or regular outages. As long as your load is constant and predictable, grid electricity will almost always be cheaper.
Costs of Maintenance and Operations
Scheduled maintenance is required for diesel generator ratings to remain reliable. It is important to change the oil, replace the filters, check the system, and also test it. Doing so regularly will help you protect your equipment and increase its life. On the other hand, if you skip maintenance, the fuel consumption will also increase.
Also, you don’t need to provide maintenance for grid electricity on the site. But it does introduce other risks. For example, unexpected outages and voltage instability can ruin sensitive equipment. Therefore, consider these sneaky expenses when looking at long-term costs.
Durability of Equipment and Recovery of Costs
A generator will begin to degenerate every second it operates. Known as wear and tear, this is common for almost all equipment. This also depends on how much you operate it. For example, some facilities will need to operate the generator way too much, which will inevitably shorten engine life and increase repair needs. So, when you’re calculating the generator costs, don’t forget to conclude this.
On the other hand, you won’t experience equipment depreciation with grid electricity. Nonetheless, relying primarily on utility supply makes you vulnerable to price changes and service outages beyond your control.
Environmental and Regulatory Factors
Diesel generators are notorious for producing emissions and a lot of noise, too. For this reason, there may be some strict regulations that can limit your operational hours. You may also need some extra control systems. Naturally, these compliance expenditures can affect the total cost of generator operations.
Coming to grid electricity, it can consist of renewable energy sources. If your company is concerned about its impact on the environment, though, there will be changes in your cost evaluation that go beyond the scope of financial metrics.
Reliability Versus Direct Cost
In industries, the reliability of power will typically outweigh the cost per unit. If a power interruption causes any safety hazard or operational failure, the least expensive option might not be the best option.
Relying on diesel generators gives you the freedom from grid failures. If you are in an industry where you absolutely cannot afford sudden failures, you can justify higher operating costs.
When Can Diesel Generators Be Cost-Effective?
The use of diesel generators can be cost-effective in instances when:
- Power from the grid is unstable.
- Power outages happen often.
- Peak power cost is high.
- Fuel costs are less than downtime costs.
In such cases, generators are the better choice as they help curb costs and operational risks.
When Can Grid Electricity Be Cost-Effective?
In general, grid electricity is cheaper when:
- The power supply is steady.
- You will operate for long durations.
- Fuel prices are very expensive.
- Environmental compliance is stringent.
Usually, the cheapest option for continuous base load requirements is grid electricity.
How You Can Choose What’s Best for You
The answer to this question is complicated. You can decide if diesel generators are cheaper than electricity by considering several factors. These include your operation’s priorities, requirements on reliability, and cost tolerance.
Also, don’t forget to take stock of fuel prices, frequency of outages, electricity tariffs, outage history, maintenance, and exposure to risks. In most cases, a combination of diesel generators with grid electricity is the best option. This way, you will have power at all times.
Conclusion
In specific contexts, diesel generators are more economical and provide more value than grid electricity. When does the use of generator power align with your commercial objectives? And when does utilising grid electricity emerge as a more efficient option? You should consider all these questions to make the best choice.
Huaquan Power offers the best power solutions and diesel generators for industrial and commercial use. They have systems that can provide standby, backup, and continuous power solutions for you to overcome challenges in balancing cost, reliability, and efficiency under diverse conditions.
