Earth Notes: Saving Electricity and Gas (2018)

Meter readings and energy-saving comments for our dual fuel use at home in 2018.
2018 PV Output


See the daily PV generation logs for 2018 as .csv and .png chart.

2018/02: this is the coldest February here at 16WW while I've been monitoring. But we're nowhere near our highest gas use, thanks to insulation and to Radbot/OpenTRV!

2018/04/03: according to @Zapaman, ~26.8% of [16WW] household energy is from renewables, 8.1% from nuclear and hence a total 34.8% from low carbon energy.

2018/05/07: on the hottest day over the Early May Bank Holiday weekend (ie since 1978) it is ~27°C in our shaded porch. A snapshot of heating performance c/o Pilio shows R^2=0.94 and a slope of ~2kWh/HDD (at 15.5°C baseline).

heating performance
MonthConsumed kWh (/d)Generated -kWh (/d)Consumed kWh (/d)PeriodNotes
2018/01214 (6.9/d)-62 (-2.0/d)585 (19/d)20171231-18:45-GMT to 20180131-19:19-GMT (31d)Meter readings: electricity generation 61.9kWh, export 35.3kWh, import 187.1kWh (thus net consumption (I+G-E) 213.5kWh); gas ~52.7m^3 (so 585kWh @ 11.1kWh/m^3).
"SmartThings" sensors to cross-calibrate OpenTRV devices draw ~10W, thus add ~0.25kWh/d to gross electricity consumption.
HDD12=166 vs 248 last January.
2018/02186 (6.6/d)-104 (-3.7/d)746 (28/d)20180131-19:19-GMT to 20180228-18:32-GMT (28d)Meter readings: electricity generation 146.6kWh, export 104.4kWh, import 143.8kWh (thus net consumption (I+G-E) 186.0kWh); gas ~67.2m^3 (so 746kWh @ 11.1kWh/m^3).
This has been the coldest February (in terms of HDD) that I have observed at 16WW.
HDD12=237 vs 139 last February.
2018/03190 (6.1/d)-216 (-7.0/d)559 (18/d)20180228-18:32-GMT to 20180331-17:10-GMT (31d)Meter readings: electricity generation 216.4kWh, export 167.3kWh, import 141.0kWh (thus net consumption (I+G-E) 190.1kWh); gas ~50.4m^3 (so 559kWh @ 11.1kWh/m^3).
A cold March, but not quite the coldest measured here!
HDD12=185 vs 77 last March.
2018/0493 (3.1/d)-290 (-9.7/d)137 (4.6/d)20180331-17:10-GMT to 20180430-17:06-GMT (30d)Meter readings: electricity generation 290.4kWh, export 284.9kWh, import 87.6kWh (thus net consumption (I+G-E) 93.1kWh); gas ~12.3m^3 (so 137kWh @ 11.1kWh/m^3).
HDD12=64 vs 65 last April.