How Much Does A Generator Cost?

13th February 2026
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Investing in a generator is a significant decision, and you’ll want to choose the right equipment for your needs. With a range of generators to choose from, it’s easy to get lost in the different sizes, price points, and fuel types.

Instead of second-guessing your decision and wondering if you’ve chosen the right generator, we’ve put together this helpful guide. Read on to discover how much generators cost and the factors that define their pricing.

What are the different types of generators?

There are numerous types of generators to be aware of, with the three most popular options being:

  • Portable Generators: Portable generators are usually compact and suitable for outdoor applications. They can offer electrical power during camping trips and for off-grid operations.
  • Inverter Generators: Inverter generators are the best option to power sensitive electronics, including smartphones and laptops. However, they have a smaller capacity than other generators and aren’t suitable for large-scale operations.
  • Standby Generators: Homes and businesses often choose standby generators, as they’re able to provide power in an outage. These generators automatically switch on when you lose access to the grid and are available for operations and homes of all sizes.
  • Solar Generators: These generators aren’t as popular, but they offer some benefits—including the ability to create energy through solar power. However, they require batteries for the solar panels and won’t offer the same capacity as a larger generator.

Factors That Affect Generator Costs

Now you know the main types of generators, it’s time to look at which factors define their price tag. Remember, generators aren’t cheap; they perform vital functions and offer peace of mind. However, some are more budget-friendly than others.

Average generator cost by fuel source:

Gasoline (Petrol) generators

Gasoline generators are usually cheap, ranging from £200 to £4,000. However, although their outright price is attractive, gasoline can be more expensive per kWh than other fuel types.

Diesel generators

Diesel generators require a larger outright investment, with prices ranging from £1,000 to above £100,000 – depending on the model and size. Diesel is more efficient than other fuel types, making it cheaper to run in the long term.

Propane generators

Propane is another cheap fuel, with generators costing around £500 to over £5,000. It’s one of the most popular fuel types for colder weather and offers some benefits. However, these generators aren’t as cheap to run, and some people might struggle to source liquid propane.

Natural gas generators

Natural gas generators cost between £1,500 to over £10,000, depending on the size. Natural gas is highly efficient, so these generators typically result in lower fuel costs. However, they’re more complex to install and not very portable.

Generator cost by size

Generators have a variety of price points, but the general rule is larger capacities and loads = higher prices. Here are some average costs of generators by their size:

  • 10kVA to 40kVA Generators: Costs range between £5,000 and £15,000.
  • 50kVA to 150kVA Generators: Costs range between £10,000 and £30,000.
  • 200kVA to 1000kVA Generators: Costs range between £24,000 and £118,000.

As you can see, size usually dictates the price, but some generators are cheaper than others. This usually occurs when the generator has entry-level features or is from a less well-known manufacturer.

Generator installation costs

The costs of installing a generator depend on whether you use a professional installation service or perform the work yourself. However, failing to install a generator correctly can prevent it from working during power outages and lead to expensive repairs.

Portable generators are easy to install, as they’re not permanently mounted, but it depends on your chosen model. Ultimately, generator installation isn’t something you want to get wrong, and using a specialist service gives you peace of mind.

In some cases, the professionals might need to install power outlets to accommodate the generator in your desired location, but this will save you from having to readjust your home or business.

Additional costs and considerations when installing a new generator

The best thing about generators is that they come with customisation options and features, enabling you to find a model that suits your needs. However, this also means you have to consider which features you’d like. Let’s explore the additional costs of installing a new generator.

Where are you using the generator?

If you’re installing an industrial or residential generator for standby use, you’ll need a backup model. Investing in a diesel generator gives you access to reliable backup power during an outage. A portable generator is less expensive but unsuitable for entire homes or businesses during a power outage.

Which size generator do you need?

Whether you’re buying a portable or standby generator, size will matter. Whole-house generators keep your electricity on and appliances running during a power outage, while smaller generators don’t have the same capacity.

It’s the same for businesses. A small shop can invest in a lower-capacity generator, but large-scale industrial operations should spend more to ensure their generator powers all operations.

Which features are you choosing?

Buying a standby business or whole-house generator means you get access to a range of features, including noise reduction mechanisms and automatic transfer switches. Diesel generators also offer better fuel economy.

Investing in a portable generator will initially save you money, but you might need to pay for additional features.

Maintenance costs

Regardless of the size of the generator you choose, maintenance is essential. However, investing in professional generator maintenance services can reduce the risk of repairs.

Considering the costs of replacing larger generators, it works much cheaper and ensures your generator provides seamless power.

Find the right generator for your needs with Solent Power

As you can see, many factors define a generator’s cost, but once you make the investment, you can look forward to seamless prime and standby power.

Finding business and home generators can be stressful, but we go out of our way to make it easy. Whether you’re unsure of how much power you require or want to choose from the most popular generators, our specialists can help.

Please contact us today with your questions. We’ll match you with a generator that aligns with your preferences.

Paul Phelps Solar Power Owner
Paul Phelps
Paul is the MD of Solent Power and specialises in emergency power solutions, helping to protect your facilities from power loss. Get in touch with us today to discuss the different power brands that we can offer and how they can suit your needs.
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