Npower Tariffs: Latest Prices & Rates

flame and bulb in a box beside npower logo

If you’re hunting for the best Npower tariffs on their website, you could be hunting for a long time. With so many to choose from, Npower’s lengthy tables and spreadsheets are enough to make anyone feel dizzy. We’ve filtered them down for you in an easy-to-read format. Find out here what rates they offer to get the best deal for your home or business.

Npower prices

Npower’s tariff page looks attractive to those wanting price security. You’ll often see the words “fixed prices” scattered among almost all of their tariffs. But beware... looks can be deceiving! While existing customers may well have started out on a fixed-rate tariff, this can easily roll over into a more expensive variable-rate tariff. New customers, on the other hand, can enjoy their fixed-rate deal - until time runs out that is. Here we explain the difference in price for new and existing Npower customers.

confused man surrounded by bills

Npower tariffs for existing customers

Existing Npower customers are certainly not rewarded for their loyalty. At first, they sign a great fixed-rate tariff deal. They enjoy the price security of fixed rates during the term of their contract, be it two or three years. Then suddenly, once it ends, their contract doesn’t roll over as many would expect it to. Instead, it’s changed to an entirely new tariff… a more expensive one that offers no price security whatsoever; the standard variable-rate tariff.

Npower claims that it explains this clearly on its website: “If you haven't chosen a new tariff we'll automatically move you onto our Standard tariff, as explained in your terms and conditions.”

Note the misleading term here: “standard”. While we may assume this means a similar fixed-rate tariff that Npower classes as standard, this is incorrect. In fact, according to the small print in the corresponding terms and conditions, when Npower say “standard tariff”, they actually mean standard “variable” tariff.

Why is the standard variable tariff the most expensive of the lot? Because it can fluctuate according to prices in the wholesale energy market. See our guide on understanding your electricity tariff for more on this.

Let’s take a look at these variable rates and then apply them to get a quote for a house in London*.

Cost type Gas (pence per day) Electricity (pence per day)
Standing charge 31.07 27.31
Unit Rate 4.47 19.15

*Figures are based on a four bedroom, semi-detached house in the suburbs of London on a dual-fuel tariff.

Npower tariffs for new residential customers

You’re a new customer or you’ve managed to secure a new or the same tariff with Npower. This is when you can snap up a fixed-rate tariff. Remember that as a new or existing customer, you’re perfectly entitled to choose the standard variable tariff. However, assuming that you’re after a fixed-rate, you have four to choose from.

1. Go Green Energy Fix October 2021

With the Go Green Energy Fix October 2021 tariff, you can enjoy fixed prices until 31 October 2021.

Your average annual cost on this tariff is approximately £1,203*.

If you decide to change tariff or provider before 12 September 2021, you will be charged a £30 exit fee per fuel. That amounts to £60 for both your gas and electricity supplies. Let’s have a look at the fixed prices you’ll be paying for both gas and electricity under this tariff:

Cost type Gas Electricity
Standing charge (pence/day) 15.91 15.82
Unit Rate (pence/kWh) 4.44 17.72

2. Fixed Energy September 2020

With the Fixed Energy September 2020 tariff, your prices are fixed until 31 September 2020.

Your average annual cost on this tariff is approximately £1,134*.

If you decide to change tariff or provider before 12 September 2020, you will be charged a £30 exit fee per fuel. As above, that’s an exit fee of £60 for both your gas and electricity supplies. These are the rates under this tariff:

Cost type Gas Electricity
Standing charge (pence/day) 26.52 22.93
Unit Rate (pence/kWh) 3.72 16.01

3. Price Freeze March 2023

If you’re on the Price Freeze March 2023 tariff, just as the name suggests, you’ll enjoy fixed prices until 31 March 2023.

Your average annual cost on this tariff is approximately £1,255*.

Following the same pattern as per the previous tariffs mentioned above, if you decide to change tariff or supplier before 12 March 2023, you’ll have to pay a total exit fee of £60. That’s £30 for gas and £30 for electricity supplies. Let’s take a look at what these rates are:

Cost type Gas Electricity
Standing charge (pence/day) 15.82 15.82
Unit Rate (pence/kWh) 4.66 18.74

4. Price Fix April 2021

Under the tariff known as Price Fix April 2021, your rates for gas and electricity will be fixed until 31 April 2021.

Your average annual cost on this tariff is approximately £1,195*.

Again, you can’t change tariff nor supplier until after 12 April 2021 unless you agree to pay an exit fee of £60 for both your gas and electricity supplies.

Cost type Gas Electricity
Standing charge (pence/day) 15.07 15.82
Unit Rate (pence/kWh) 4.43 17.59

*It is assumed that the customer is on a standard single rate meter, consumes 3,100kWh electricity and 12,000kWh gas annually and pays by Direct Debit.

**The prices displayed above are based on the payment type being by monthly or quarterly direct debit as these are the cheapest among the prices payable among other payment methods available.

Npower business tariffs

office desk

Following on from our average business energy bills guide, there are lots of factors that can affect a company’s annual expense on energy. Its size, be it micro, small, medium or large, gives us some idea of the annual consumption and therefore how much it could be paying per year.

Npower offers its business customers three tariffs to choose from. To get an idea of what you could be paying with Npower, get a quote online. See our Npower Business guide for an example in practice. We used Npower’s online quote tool to find out what a business would pay based on size, usage and average annual expenditure on electricity bills.


A microbusiness is typically one that employs up to 10 employees and has an annual turnover of up to £2 million. A microbusiness consumes on average 8,000 kWh of electricity per year and would spend on average £1,344 on electricity.

For the purposes of getting a quote, we needed the postcode of a microbusiness. We used that of a charity shop in London (Octavia Foundation: 303 King's Rd, Chelsea, London SW35EP). The cheapest tariff we were offered was that with the following features:

  • Start month: August 2019
  • Payment method: Monthly variable direct debit
  • Contract length: 30 day rolling
  • Yearly expenditure: £87.48 per year

These are the electricity rates a micro business would pay under this Npower tariff for business:

Cost type Rate
Electricity standing charge 23.54 p/day
Electricity unit rate 19.52 p/kWh

Small business

A small business is typically one that employs up to 50 employees and has an annual turnover of up to £10 million. A small business consumes on average 20,000 kWh of electricity per year and would typically spend £3,014 per year for this.

For the purposes of getting a quote, we used the addresses of several small companies. Unfortunately, Npower’s online quote tool failed to bring up figures on any occasion, displaying a message that it was unable to give us a quote online. This was surprising since other supplier pages, such as British Gas, were capable of providing a quote for a variety of business sizes.

Medium business

A medium business is typically one that employs up to 250 staff and has an annual turnover of up to £50 million. A medium business consumes on average 40,000 kWh of electricity per year and would spend approximately £5,504 per year on electricity.

For the purposes of getting a quote, we used the addresses of various medium-sized companies. Unfortunately, Npower's online quote tool was once again unable to perform its function.

Large business

A large business is usually one that has at least 5000 employees and an annual turnover greater than £1.4 million. A large business consumes on average 80,000 kWh of electricity per year and would spend approximately £10,688 per year for this.

Surprise surprise, Npower’s online quote tool was unable to give us any rates when we used postcodes of several large businesses. If you run a large business and would like to know how much you could be spending per year on gas or electricity, we would advise you to contact Npower directly.

Landlord tariffs

If you’re a landlord who rents out commercial properties, it may be beneficial to get a short-term bespoke rate from your energy supplier for those periods when the premises are unoccupied.

Unfortunately, Npower does not offer any such bespoke rates. For an example of a supplier that does, check out the rates offered by British Gas as displayed below:

British Gas Six month tariff for landlords
Cost type Gas Electricity
Unit rate (pence/kWh) 5.86 19.50
Standing charge (pence/day) 0 0

Are Npower prices cheap?

Npower’s tariffs are among the most expensive compared to other energy providers. This is perhaps one of the many factors that contributed to its downfall and impending rescue from Eon. Let’s take a closer look at how Npower’s prices compare to the market average. This will help you decide whether it’s worth switching to Npower, staying with them, or jumping ship to another supplier.

Compare Npower prices

What’s the market average? This is the average household’s expenditure on gas and electricity if it were to be charged the maximum price cap for dual fuel tariffs set by Ofgem. The price cap is currently £1,254.

What would Npower charge me? Setting the benchmark using a three-bedroom household in London with medium fuel consumption on a standard dual-fuel tariff, you could expect to pay around £1,343.35 per year on your energy bills.

How does Npower compare? Npower is £89.35 more expensive than the market average.

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Don’t let the energy market dictate how much you will pay!

Call Selectra to find the best tariff for you and start saving money.

Price increases

To shed some light on the price cap mentioned above, Ofgem introduced the cap in January 2019, originally set at £1,137. This meant that energy suppliers were not allowed to charge any more than £1,137 per year on any of their tariffs. However on 1 April 2019, Ofgem increased the cap by £117 for customers on default tariffs, including standard variable tariffs. Did Npower increase its prices in line with the cap? Let’s find out from what the press has been saying about it.

Price increases in the news

Perhaps unsurprisingly, Npower followed its Big Six cousins by hiking its prices. On 13 February 2019, The Independent reported that Npower increased its prices by 10 per cent, affecting 1 million customers on the supplier’s standard variable tariff.

On 29 May 2019, The Guardian reported yet another price increase by Npower. Since many of Npower’s fixed-term tariffs were due to end on 31 May 2019, those customers who took no action were automatically rolled over to Npower’s default variable tariff. You’ve seen above why this would be classed as a bad thing.

Two of the expiring Npower deals – Online Energy Fix May 2019 and Online Broker Fix May 2019 – resulted in jumps of £362 and £343 respectively.* To put this into context, a typical default variable-rate customer would now have to pay £1,254 per year for his/her energy supply.

*Figures were calculated assuming a household on a dual-fuel tariff paying by monthly direct debit with medium annual consumption.

Npower tariffs and prices FAQ

Below we’ve answered the most common questions that people often ask about Npower tariffs.

Can I change Npower tariff online?

Yes. You need to log in to your Npower online account to do this. Follow the instructions on how to change your tariff and Npower will move your account to the new one that you have selected.

What is Npower cheapest tariff?

The Price Fix April 2021 tariff appears to be the cheapest available over the medium-term.

What is the cheapest standing charge for electricity?

The tariff with the cheapest standing charge appears to be that of the Price Fix April 2021 Gas DD, set at 15.07 pence per day.

Does Npower charge exit fee?

Firstly, let’s make sure we understand what an exit fee is. This is a fee that a supplier will charge for terminating a contract and switching to another supplier during your term. It typically amounts to £30 per fuel, i.e. £60 in total for switching both your fixed gas and electricity tariffs. If you’re on a variable tariff, Npower will not charge you an exit fee regardless of when you choose to switch supplier.

Npower tariffs - the Selectra verdict

Based on the fact that Npower is significantly more expensive than the market average, we give it a rating of 2 / 5 stars. Once Npower merges with Eon, only time will tell whether their rates will be replaced with Eon’s or whether a new set of rates will emerge.

Npower: Selectra's verdict - ★★

To find out more about Npower and its range of services, see our comprehensive Npower guide.

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