How much does the energy price affect your energy consumption?
UK domestic gas consumption in 2022 reduced 15% compared to the previous five years (2017-2021). The downwards trend continued in 2023 and reduced 21%.
Statistically, the 2011-23 CORRELATION of UK domestic gas consumption with PRICE is -0.61 (strong). The CORRELATION with annual TEMPERATURE (CET) is -0.88 (very strong).
Q. Did your 2022 and 2023 energy consumption change because of PRICE or SOMETHING ELSE?
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Really quite ashamed that I cannot answer your question! So tied up with solar detail - spreadsheets galore, that cheap old gas, with tado only heating where required, gets a back seat. Sorry!
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@samd What are you thinking of installing for solar? We’re three months in with solar.
The ‘actual’ spreadsheet is somewhat different to my original analysis and very different to the example ROI provided by the contractor. The big difference ‘actual’ to the ‘plan’ is that we can import to the battery from the grid overnight at 7.5p per kWh and export solar to the grid at 15p. The solar runs the house and tops up the battery. Excess solar goes to the eddi to heat the HW during the day and save 6.5p for gas, or choose to export for 15p. The Zappi and podpoint can be set to charge the EVs at 7.5p overnight or use excess during the day. However, the EVs don’t like the solar excess fluctuating to near zero.
Good luck with whatever you do.
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Ditto. We are unsure about enrgy savings or $$. Playing with solar and eddi.
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@SteveIreland Glad to hear that you are happy with the energy/oil outcomes and 'free Saturday'.
SWMBO has control of the room temperatures, hot water and home/away. The Tado ROI was less than 12 months and our annual energy savings are better than 50%. The 7.5kW solar array and 10kWh battery was a lot more expensive. Today, everything is being driven off the solar - kettle, dishwasher, hot water, EV charger - and sending 1.7kW to the grid.
Not convinced of additional benefits from Energy IQ thingy compared to a spreadsheet of the monthly and daily data?
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I’ve switched to a heat pump. Still have a gas boiler as back up but gas consumption is down by more than 60% while electricity consumption has more than doubled. Total number of Kw/hrs of energy, regardless of source, has plummeted because of the efficiency of the heat pump.1
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@SteveIreland Hello Steve. Interesting to hear that you think of the expected length of time that you will stay at a property will decide energy savings choices. That fits with some of my older friends?
Looking at the big ticket items and ROI …
Switching from ICE to EV in 2017 saved us £2,500 a year. We're 7 years in, close to break-even or thereabouts.
Installed Tado in February 2022 and cost £750. Since then, Excel says the system has helped us to save around £2,500 on the heating bill and ROI is 9 month at 2024 prices.
Solar PV in 2024, with battery EDDI and EV charger, cost an awful lot more and we're still experimenting/learning how it behaves. Six months savings are about £1,150. Forecast ROI is 8 to 9 years.
QED. Smart controls have the shortest ROI.
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Am right in the middle of govt grant applications for the charity I assist. In the course of that we commissioned an Independent Energy Assessor.
As the IEA prepared his model, which seemed to be based upon a many, but boiler plate concepts, I realised that many of the factors affecting RoI that they draw upon are perhaps (a) out of date and (b) really not stable. Three separate IEAs have claimed that I should expect RoI to be in the order of 17-18 years for Solar PV; COP for ground source heating to be 2.5; COP for air pumps to be 3.5. Yet the published salesy side claims much better results
Heating oil can go up around our place by 11-21% over winter; electricity is still more than 3 times the cost of oil or gas. So, bottom line, oil prices forced us to cut back on output in the charity.
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@policywonk Hope you can find away to manage the energy costs for your charity.
Our initial experience of forecasting the ROI for solar PV concurs with your IEA. Hard to convince SWMBO to open the piggy-bank when the saving (25p/kWh) from 'free' PV leccy forecasts ROI as circa 14.5 years.
The actual savings from signing up to a 'flexible' leccy tariff (with 7.5kW PV, 10kWh battery and two EVs) aligns well with the calculations. The forecast ROI (July 2024 leccy prices) is 8-9 years.
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