Earth Notes: Saving Electricity and Gas (2019)

Updated 2019-09-09 18:39 GMT.
Meter readings and energy-saving notes for dual fuel use at home in 2019.
Meter readings and analysis of our electricity and gas carbon footprint at home in 2019.


See the daily PV generation logs for 2019 as .csv and .png chart.

2019 Fuel Consumption Data
MonthConsumed kWh (/d)Generated -kWh (/d)Consumed kWh (/d) PeriodNotes
2019-01 198 (6.4/d) -72 (-2.3/d) 748 (24/d) 20191231T18:02Z to 20190131T18:09Z (31d) Meter readings: electricity generation 72.4kWh, export 17.5kWh, import 142.8kWh (thus net consumption (I+G-E) 197.7kWh, self consumption ((N-I)/N) 28%); gas ~67.4m^3 (so 748kWh @ 11.1kWh/m^3).
Electricity imports down to 143kWh from 187kWh last January (4.6kWh/d down from 6.0kWh/d), and self-consumption up from 12% to 28%.
HDD12=218 vs 166 last January.
2019-02 164 (5.9/d) -162 (-5.8/d) 519 (19/d) 20190131T18:09Z to 20190228T20:09Z (28d) Meter readings: electricity generation 162.3kWh, export 92.2kWh, import 94.2kWh (thus net consumption (I+G-E) 164.3kWh, self consumption ((N-I)/N) 43%); gas ~46.8m^3 (so 519kWh @ 11.1kWh/m^3).
Electricity imports down to 94kWh from 144kWh last February (3.3kWh/d down from 5.1kWh/d), and self-consumption up from 23% to 43%.
HDD12=132 vs 237 last February.
2019-03 196 (6.3/d) -281 (-9.1/d) 344 (11/d) 20190228T20:09Z to 20190331T17:22Z (31d) Meter readings: electricity generation 281.4kWh, export 176.8kWh, import 91.8kWh (thus net consumption (I+G-E) 196.4kWh, self consumption ((N-I)/N) 53%); gas ~31.0m^3 (so 344kWh @ 11.1kWh/m^3).
Electricity imports down to 92kWh from 141kWh last March (3.0kWh/d down from 4.5kWh/d), and self-consumption up from 26% to 53%.
HDD12=89 vs 185 last March.
2019-04 150 (5.0/d) -450 (-15/d) 138 (4.6/d) 20190331T17:22Z to 20190430T17:04Z (30d) Meter readings: electricity generation 449.5kWh, export 345.5kWh, import 45.9kWh (thus net consumption (I+G-E) 149.9kWh, self consumption ((N-I)/N) 69%); gas ~12.4m^3 (so 138kWh @ 11.1kWh/m^3).
Passed 30MWh generation on the first meter (first 3/4 of the PV). (Note that early in May 30MWh in exports is then passed.)
Electricity imports down to 47kWh from 88kWh last April (1.5kWh/d down from 2.9kWh/d), and self-consumption up from 6% to 69%.
HDD12=89 vs 64 last April.
2019-05 171 (5.5/d) -562 (-18/d) 120 (3.9/d) 20190430T17:04Z to 20190531T17:04Z (31d) Meter readings: electricity generation 561.6kWh, export 433.2kWh, import 42.8kWh (thus net consumption (I+G-E) 171.2kWh, self consumption ((N-I)/N) 75%); gas ~10.8m^3 (so 120kWh @ 11.1kWh/m^3).
Passed 9MWh generation on the second meter (last 1/4 of the PV). 30MWh in exports was passed.
Electricity imports down to 43kWh from 66kWh last May (1.4kWh/d down from 2.1kWh/d), and self-consumption up from 59% to 75%.
HDD12=39 vs 23 last May.
2019-06 161 (5.4/d) -542 (-18/d) 108 (3.5/d) 20190531T17:04Z to 20190630T17:15Z (30d) Meter readings: electricity generation 542.1kWh, export 420.1kWh, import 39.8kWh (thus net consumption (I+G-E) 161.4kWh, self consumption ((N-I)/N) 75%); gas ~9.7m^3 (so 108kWh @ 11.1kWh/m^3).
Electricity imports down to 40kWh from 56kWh last June (1.3kWh/d down from 1.9kWh/d), and self-consumption up from 59% to 75% (as for May!).
HDD12=4 vs 2 last June.
2019-07 150 (4.8/d) -594 (-19/d) 102 (3.3/d) 20190630T17:15Z to 20190731T17:26Z (31d) Meter readings: electricity generation 593.6kWh, export 474.2kWh, import 30.7kWh (thus net consumption (I+G-E) 150.1kWh, self consumption ((N-I)/N) 80%); gas ~9.2m^3 (so 102kWh @ 11.1kWh/m^3).
Electricity imports down to 31kWh from 55kWh last July (1.0kWh/d down from 1.8kWh/d), and self-consumption up from 60% to 80%.
HDD12=0 vs 0 last July.
2019-08 100 (3.2/d) -527 (-17/d) 48 (1.5/d) 20190731T17:26Z to 20190831T18:15Z (31d) Meter readings: electricity generation 527.3kWh, export 445.1kWh, import 17.9kWh (thus net consumption (I+G-E) 100.1kWh, self consumption ((N-I)/N) 82%); gas ~4.3m^3 (so 48kWh @ 11.1kWh/m^3).
Electricity imports down to 18kWh from 30kWh last August (0.6kWh/d down from 1.0kWh/d), and self-consumption up from 70% to 82%.
Imports while away on holiday for ~14 days ~1.7kWh ie ~120Wh/d or ~5W (which is the Enphase import threshold). Imports this year are down 34% so far. Gross consuption was ~1.9kWh/d vs ~1.6kWh/d in the same period last year. That may be ~13W between the new router, and two extra RPi3s running on-grid for test and monitoring purposes. The router is moving to being partially powered off-grid 2019-09-03 (consumption ~250Wh/d).
HDD12=0 vs 3 last August.


  • 2019-06-04: Greenhouse gas reporting: conversion factors 2019: These emission conversion factors can be used to report on 2019 greenhouse gas emissions by UK based organisations of all sizes, and for international organisations reporting on UK operations.