Smart Home Energy Analysis 2025
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This is my energy analysis for 2025, to assess the impact of my smart home solar installation project. The project was started in October 2022 and my energy analysis page explains how my returns/savings are calculated. Previous years include: 2024, 2023.
May 2025
This month we are having our extension solar installed.
Transport
With our trip to Monaco, we put 13.5kWh into the CUPRA Born V3 at 85p/kWh, costing £11.50.
April 2025
Electricity
With our smart home extension being built, we no longer have a kitchen, so that means no cookers, tumble dryer, etc. The only appliance left plugged in is our washing machine. This should mean our electricity usage is lower.
- Our historical baseline electricity usage is 387kWh (12.5kWh per day).
- We imported 364kWh for home use (low 6.6kWh, high 16.4kWh, average 11.7kWh). This is a 6.0% saving on our historical usage and cost £26.00, a saving of £67.61 based on the standard tariff.
- Our home usage was 387kWh (low 10.1kWh, high 16.8kWh, average 12.9kWh).
- We generated 10146kWh (low 11.0kWh, high 44.9kWh, average 34.9kWh).
- We exported 906kWh, (low 6.7kWh, high 42.1kWh, average 30.2kWh) and earnt £135.63.
- The Monthly Generation Factor is 1046kWh ÷ 6.63kW = 157.8
Gas
We are still using our gas central heating in the morning and on some days. The night time temperatures have been quite cool. With the smart home extension work going on and the back wall of house gone, our home is hard to heat.
Transport
This month we collected our second CUPRA Born.
March 2025
March was the sunniest March on record! 🌞
Electricity
- Our historical baseline electricity usage is 387kWh (12.5kWh per day).
- We imported 364kWh for home use (low 6.6kWh, high 16.4kWh, average 11.7kWh). This is a 6.0% saving on our historical usage and cost £26.00, a saving of £67.61 based on the standard tariff.
- Our home usage was 437kWh (low 11.7kWh, high 17.6kWh, average 14.1kWh).
- We generated 910kWh (low 10.5kWh, high 42.6kWh, average 29.4kWh).
- We exported 778kWh, (low 4.3kWh, high 38.9kWh, average 25.1kWh) and earnt £116.77.
- The Monthly Generation Factor is 778kWh ÷ 6.63kW = 117.3
Gas
- Our historical baseline gas usage for March is 2012kWh, an average of 72.9kWh per day.
- We used 1538kWh this month (daily average 49.6kWh).
- This is an decrease of 23.8% on our baseline and a saving of £27.09.
Transport
- We have driven a total of 36,053 miles in our CUPRA Born and spent £1248.66 on electricity to charge it.
- We have driven 1308 miles this month and imported 365kWh into our CUPRA Born costing £27.47.
- Petrol averaged £1.36 per litre giving a saving/return of £186.79 this month.
February 2025
Electricity
- Our historical baseline electricity usage is 433kWh (15.5kWh per day).
- We imported 415kWh for home use (low 10.4kWh, high 23.2kWh, average 14.9kWh). This is a 3.4% reduction on our historical usage and cost £43.81, a saving of £89.93 based on the standard tariff.
- Our home usage was 584kWh (low 9.4kWh, high 26.9kWh, average 18.8kWh).
- We generated 284kWh (low 0.8kWh, high 27.2kWh, average 9.1kWh).
- We exported 152kWh, (low 0.0kWh, high 21.0kWh, average 4.9kWh) and earnt £22.78.
- The Monthly Generation Factor is 284kWh ÷ 6.63kW = 42.8
Gas
For the first time in a long while, we actually used more than our monthly baseline figure. I put this down to me running an experiment this month and leaving the heating on all day at 21.5°C.
- Our historical baseline gas usage for February is 2041kWh, an average of 72.9kWh per day.
- We used 2072kWh this month (daily average 74.0kWh).
- This is an increase of 1.1% on our baseline and a cost of £1.42.
Transport
- We have driven a total of 34,745 miles in our CUPRA Born and spent £1221.19 on electricity to charge it.
- We have driven 1114 miles this month and imported 365kWh into our CUPRA Born costing £25.58.
- Petrol averaged £1.362 per litre giving a saving/return of £156.90 this month.
January 2025
Electricity
Our home usage was 10.5% over our baseline figure for January and this is due to the dehumidier being on in our conservatory all the time, along with a new 'beer fridge'. Our actual import for home use is lower though and all of this usage has been time-shifted to the super cheap Intelligent Octopus Go tariff. In the winter months, a lot of electricity is used by our tumble dryer.
- Our historical baseline electricity usage is 528kWh (17.0kWh per day).
- We imported 502kWh for home use (low 7.3kWh, high 23.1kWh, average 16.2kWh). This is a 4.9% reduction on our historical usage and cost £43.81, a saving of £89.93 based on the standard tariff.
- Our home usage was 584kWh (low 9.4kWh, high 26.9kWh, average 18.8kWh).
- We generated 284kWh (low 0.8kWh, high 27.2kWh, average 9.1kWh).
- We exported 152kWh, (low 0.0kWh, high 21.0kWh, average 4.9kWh) and earnt £22.78.
- The Monthly Generation Factor is 284kWh ÷ 6.63kW = 42.8
Gas
Despite being a cold January, our gas usage dropped significantly. The primary reason for this is our new gas boiler is much more efficient. The other reason is how I am using it. I've been trying a different approach with my smart control and have been leaving the heating on all day (from 06:00 to 22:30). Our boiler seems to run more efficiently this way and keep our home much more confortable. My Drayton Wiser smart thermostat does an amazing job of keeping the temperature an even 21.5°C within our home.
- Our historical baseline gas usage for January is 3088kWh, an average of 99.6kWh per day.
- We used 2378kWh this month (daily average 76.7kWh).
- This is a reduction of 28.4% on our baseline and a saving/return of £56.63.
Transport
The CUPRA Born has been brilliant over these last cold months. Range has dropped from about 220 miles to around 200 miles. We can still easily do the 180 mile round trip to London and back on a single charge. The remote defrost capability using the app is also a brilliant feature in winter.
- We have driven a total of 33,631 miles in our CUPRA Born and spent £1195.21 on electricity to charge it.
- We have driven 1612 miles this month and imported 528kWh into our CUPRA Born costing £36.94.
- Petrol averaged £1.32 per litre giving a saving/return of £204.29 this month.
