Our Agile Octopus electricity tariff blog

Save £50 on your first electricity bill when you switch to Octopus Energy! Click here for more information.
Save £50 on your first electricity bill when you switch to Octopus Energy! Click here for more information.

Update: We are now on the Octopus Go tariff. You can read more about that here: https://redelectrical.co.uk/our-agile-go-electricity-tariff-blog/

Octopus Energy launched their Agile Octopus tariff in February 2018. It’s still a very novel concept; rather than paying a set rate for your electricity regardless of the time of day, Octopus track the wholesale price of electricity which means that the rate you pay changes every half an hour. There’s a premium time between 4pm and 7pm where the rate is highest, so you really don’t want to be using much, if any, electricity during that period.

There are even times when the price of electricity drops so much that it goes negative, which means Octopus are paying its customers to use electricity!

Agile Octopus therefore suits those with a battery storage system in their home, and particularly those who also have solar panels (or any other form of renewable electricity generating equipment) which can feed the battery to keep it topped up prior to the premium evening period.

We were already with Octopus on an economy 7 tariff but we switched over to the Agile tariff on 7 December 2018. It was an easy process as we already had a smart meter fitted from a previous supplier. It’s a SMETS1 type which if you believe the tabloids, won’t work when you change suppliers, but Octopus adopted our meter with no issues. Apparently if your meter has “Secure” printed on it, they can use it.

Our 6kW of solar panels as shown on Google Earth.

We have 6.3kW of solar panels which is large for a domestic system, but the house doesn’t have a gas supply and therefore is electrically heated by an air source heat pump. We also have an electric car which we mainly charge using surplus solar in the summer and on cheap rate in the winter using our MyEnergi Zappi EV charge point, and the odd top-up from Chorley’s free public chargers.

A Tesla Powerwall 2 gives us 13.5kWh of storage capacity for any surplus electricity from our solar panels, and also charges on cheap rate electricity in the winter when solar yields aren’t as good. It was installed on 15 May 2019, replacing the original Powerwall 1 which we had been using for around 3 years and which is now at my brother’s house reducing his electricity bills.

We have a hot water cylinder so a MyEnergi Eddi immersion heater controller diverts surplus solar electricity to heat our water once the Powerwall is fully charged.

Octopus are a tech-led company and a great feature is that their systems work with the IFTTT service. As we have Heatmiser Neo heating controls in our home which are also IFTTT compatible, I’ve set up and IFTTT rule that automatically switches on the heat pump to heat the hot water cylinder if the Agile electricity price drops below 5p per kWh. This triggers quite often on a Sunday morning but the cylinder is usually hot in the summer from the day before so we only tend to get the benefit in winter.

Update Nov 2020: I’ve deleted the above as we no longer use IFTTT. MyEnergi have launched an online portal for their products which can track the Agile Octopus prices and automatically charge the car and produce hot water when the electricity price drops below a settable price. Brilliant! Existing MyEnergi users with a hub can register here: https://myaccount.myenergi.com/

Our electricity bills

Below is a summary of the bills we’ve had so far from Octopus. Note that the bill amounts and average price per day include VAT and the 20p per day standing charge. The weighted average unit cost is what a standard tariff would have to be set at for the bill to come to the same total.


Period Bill amount Number
of days
Average price
per day
Weighted average
unit cost (p/kWh)
7 Dec 18 – 27 Jan 19 £ 91.24 51 £ 1.79 13.81 p/kWh
28 Jan 19 – 27 Feb 19 £ 38.07 30 £ 1.27 11.86 p/kWh
28 Feb 19 – 27 Mar 19 £ 29.69 27 £ 1.10 9.55 p/kWh
28 Mar 19 – 6 May 19 £ 18.03 39 £ 0.46 8.70 p/kWh
7 May 19 – 15 May 19 £ 6.04 9 £ 0.67 8.46 p/kWh
16 May 19 – 27 Jul 19 £ 22.67 43 £ 0.53 9.89 p/kWh
28 Jul 19 – 27 Aug 19 £ 12.68 31 £ 0.41 7.71 p/kWh
29 Aug 19 – 28 Sep 19 £ 18.54 31 £ 0.60 7.55 p/kWh
29 Sep 19 – 28 Oct 19 £ 28.16 30 £ 0.94 7.50 p/kWh
29 Oct 19 – 28 Nov 19 £ 57.59 31 £ 1.86 8.47 p/kWh

You’ll notice that the price reduces significantly once we’re out of the heating season and our electricity usage becomes more comparable with a gas-heated house. Our bill for 12 months has amounted to less than £350!

Switching to Agile Octopus

If you have a battery storage system and you’re already with Octopus Energy, contact them and ask to switch to the Agile tariff. If you’re not with Octopus Energy then you can use the following link to switch your electricity supplier. There’s a £50 opening credit from them for you, and £50 applied to my account too.

Switch to Octopus Energy by clicking here and enjoy a £50 reward.

Battery storage systems

We install battery storage systems to all types of solar PV system in the North West of England, including adding batteries to existing systems. We only use excellent quality products that actually work, and include full monitoring so that you can see it in action. Give us a call for a chat.