June 2025 updates
June Electric:
I managed to maintain a 4.88% Peak/Off-Peak ratio, which is another improvement on last month’s 6%.
There were 2 days that were overcast, and on the rest I managed to have only minimal peak usage.
Electricity costs for the month of June: £98.90 for 2025, £161.98 for 2024 and £452.38 for 2023 – yet more great on-going savings.
Electricity demand for the month of June: 1780kWh for 2025, 1776kWh for 2024 and 1202kWh for 2023.
The additional savings for this year are almost entirely down to the Solar and Battery as I was on the same tariff last June as I am now, I used about the same amount of electricity, yet it cost me about 38% less.
The off-peak/peak/SC values for June were £0.075/0.2794/0.4785 for 2024 vs £0.07/£0.2896/0.47605 for 2025, so not a huge difference and the same as last month.
This can also be seen in the month on month usage vs cost graphs:
June Solar:
Actual production for May far exceeded the forecast for every day, often by way more than double.
The various arrays produced the following levels of energy: Garage 346.94 kWh, Office 263.48kWh, East 256.87kWh, West 310.87kWh for a total of 1182.28kWh which is again my best month to date, beating last month by 29.90kWh.
A very good month for solar production, I also managed to export 501.72kWh for a total saving of £75.26.
The import costs of £98.90 less the export savings of £75.26 means my net cost for June was £23.65 for 1780kWh of demand making my average rate £0.0135/kWh.
June Gas:
Gas costs for the month of June: £31.54 for 2025, £24.03 for 2024 and £86.46 for 2023.
Gas usage for the month of June: 463kWh for 2025, 328kWh for 2024 and 186kWh for 2023.
£6.00 more than last year, 31% more gas consumed and on the Octopus Gas Tracker tariff vs the Octopus Standard Gas Tariff, so similar to last month.
Gas prices have started to fall again this month, I would have paid a lot more had I still been on the Octopus Standard Tariff, which was £0.0603 per kWh for May £44.07 ((480 * 0.0603) + 15.13) or an additional £12.18 for the month.
The heating was off for the entire month, so gas was only used for heating the hot water.
Again all visible in the usage vs cost graphs.
There were two Saver Sessions this month, 04/06 and 30/06, my Home Assistant automation signed me up automatically
I received notification about these sessions via emails sent round midday of the day in question.
The first one was between 20:00 and 20:30 of the 4th June, offering 95 Octopoints (11.875p) per kWh saved.
The second one was between 18:00 and 19:00 of the 30th June, offering 112 Octopoints (14p) per kWh saved.
Since these were all offering less than my export guarantee and way less than the peak rate, I made no effort to charge the batteries beforehand, or discharge them during the sessions
As a result my savings were somewhat low.
I saved 0.25kWh on the 4th, which netted me 24 Octopints (£0.03).
I saved kWh on the 4th, which netted me Octopints (£). (still calculating)
Absolutely not worth the effort to even bother doing anything regarding these sessions.
There was also a free electricity session on 22nd June between 14:00 and 15:00, however Octopus Energy have changed the rules this year and now, if you are on the Intelligent Octopus Go tariff, you only qualify for a free hour of car charging, not general household use, as such, even though I signed up for the session, I didn’t actually do anything about it