Test meal 26-Feb-23 One generous plate of spagetti with beef bolognese
Exactly the same meal as 24th, this time cooked on one electric hob ring with mainly rooftop solar power.
Pre-warmed water from the small kettle was used with exactly the same 110g dry weight of pasta as previously.
The plug-in energy monitor showed 0.295 kWh of electricity used in cooking. Pans were stacked so that steam above the pasta warmed the frying pan of reheat bolognese, which warmed an upside down plate instead of lids.
This time I also noted 0.2 kWh of electricity used in the small kettle to do the washing up and have a coffee after. With the small kettle being inside my solar generating capacity, that could also be done for free, in the summer. Sadly not today. With partly cloudy (3/8 cumulus) weather, we get unpredictable minutes of up to 2kW of generation and then too little to use for cooking, even with this smallish 1.2kW electric hob.
So, for todays' meal, I'll claim "0.5 kWh". It is important and unknown whether this used "half solar", in which case gas would be cheaper, or "three quarters solar", in which case electric was definitely cheaper. Electric just about wins on CO2e irrespective of whether it was half or three quarters solar, with the biggest uncertainty (see https://www.carbonintensity.org.uk/
)for my region at present being 40% of national grid electricity being "imports", for which CO2 does not get counted.
I'm not about to tell everyone to buy an electric hob like mine, which I got for £5 from a second hand shop, because it has a truly horrible thermostat. There is design fault / (cost reduction feature) placing the thermostat more in contact with the outer steel housing than with the hot ring, making it unsuitable for unattended cooking.