December Solar Generation and Export Numbers
Here is the overview for December 2024. Agile Octopus pricing was high in December, on some days it was close to its cap of £1 kWh. On the 11th we had slots costing 88.620p, 94.773p, 88.620, 83.380p, 81.459p. Of course the batteries save us from these prices. I have added the rates at the bottom of this page. Rates recovered near the end of the month. We had multiple days where the daily cost was over £6. We also had a few days of less than £1, and one day of 8p. We also had an Octopus Saving Session on the 11th that earned us 1,032 Octopoints, £1.29.
Saying all that, our average Agile Octopus cost was 12.90p per kWh, that is 4p less than November.
The heat pump is working well. Hot water is heated at 5am and 4pm. Now it is colder, we set the heating to 21c from 3am to 9pm. Comparing costs from 2023 with gas and 2024 with the heat pump, it looks like this. This is cost comparison only. This does not include tariff changes or working out how much gas we would have used.
Heat Pump v Gas
| Month | Difference | Gas (2023) | Electricity (2023) | Gas (2024) | Electricity (2024) | |
|---|---|---|---|---|---|---|
| December | +£2.02 | £68.08 | £63.64 | £9.49 | £124.25 |
You can see the heat pump numbers here.
The worst generation day was the 1st with only 0.60 kWh. The best was the 6th when 4.10 kWh was generated.
The best export day was the 21st with 6.00 kWh. This was a force discharge from the battery. The best solar export day was the 13th with 0.30 kWh.
As solar panels output declines over the years I have added the 2023 generation to the table at the bottom. Of course weather comes into it as well, but I thought it would be interesting to track.
This year we have had 107 days where we generated more solar than we consumed, and 163 days more solar was generated than we imported from the grid.
December 2024 Octopus Energy bill
Octopus Watch Tariff Comparison Report. This does not include exporting
Best Solar Generation
| Date | kWh | |
|---|---|---|
| Generation | 26th May 2023 | 32.90 |
| Front generation | 14th June 2023 | 19.80 |
| Back generation | 7th June 2023 | 14.70 |
| Worst generation | 12th December 2022 | 0.20 |
Solar Generation December 2024
| Date | kWh | |
|---|---|---|
| Best generation | 20th | 4.90 |
| Best front generation | 20th | 3.60 |
| Best back generation | 11th | 1.90 |
| Worst generation | 23rd | 0.40 |
| Worst front generation | 23rd | 0.20 |
| Worst back generation | 23rd | 0.20 |
Best Solar Export and Profit
| Date | kWh | Profit | |
|---|---|---|---|
| Exported kWh | 15th June 2024 | 22.20 | |
| Exported profit | 15th June 2024 | 22.20 | £3.15 (15p kWh) |
| Profit day | 14th April 2024 | 18.20 | £2.67 |
Solar/Battery Export and Profit December 2024
| Date | kWh | Income/Cost | |
|---|---|---|---|
| Best kWh export - Battery & Solar | 23rd | 6.00 | |
| Best kWh export - Solar Only | 13th | 0.30 | |
| Best export profit | 21st | 6.01 | £0.90 (15p kWh) |
| Cheapest Day | 22nd | -£0.08 |
The graph below shows the generation for both front and back panels
The graph below shows the generation for both front and back panels
2024 showing generation, battery discharge, battery charging, export, import to use and consumption
Generation
Overview for December
The graph below shows the generation for each day
Graph showing production for the month
The graphs below show the generation split between the front and back panels
Graph showing production for the front facing panels
Graph showing production for the back facing panels
The graphs below show the yearly generation split across both the back and front panels
Front panel generation for for 2024
Back panel generation for 2024
Octopus Agile
The costs shown here do include the standing charge. Any comparisons are compared to the unit cost if we were not on Octopus Agile, which is 0.2521per kWh. This is the new unit cost after the price cap took affect. The standing charge was 0.4211p
As mentioned above we are still using overnight slots due to my new export strategy. The average slot price was quite high this month.
December Grid Information
| Standard Tariff | 25.210p | ||
| Standing Charge | 42.11p | ||
| Cost from the grid | £111.89 (Agile) | £221.84 (Standard) | |
| Savings including export | 114.99 | ||
| Exported | 33.60 kWh | £5.04 @ 15p kWh | |
| Agile slots used | 357 | ||
| Agile plunge slots used | 19 | ||
| Average Agile slot price | 16.68 | ||
| Cheapest slot | -1.459p | ||
| Most expensive slot | 12.90p | ||
| House consumed | 822.50 kWh | ||
| Solar generated 2024/2023 | 53.10 kWh | 55.40 kWh | |
| Percentage generated by solar | 6% | ||
| Self Sustained Days 2024 (More solar than consumed) | 107 | ||
| Self Sustained Days 2024 (More solar than we imported) | 163 | ||
Here is the Octopus Watch report summary
Octopus Watch summary
Agile rates for the 10th December. The highest since we joined Agile Octopus
Featured posts
The best and worst solar power generation days