Earth Notes: Saving Electricity and Gas (2016)

Updated 2022-05-15 21:27 GMT.
By Damon Hart-Davis.
Meter readings and energy-saving notes for dual fuel use at home in 2016.
electricity meter 2019 09
2016 PV Output
Annual supplier statements state that we are using/importing about 3 kWh electricity and 7 kWh gas on average each day for the year. 2016 was a little colder than the years either side but not remarkable.

2016

2016 data (kWh: e used 1831, e gen -3739, g 3851).

Off-grid 40.1kWh captured by primary (MPPT) solar controller from 2016-08-14.

See the daily PV generation logs for 2016 as .csv and .png chart.

2016 kWh and HDD

See gas use kWh and heating degree days (HDD) by time for 2016 as .csv and .png chart.

2016 kWh vs HDD regression

See gas kWh vs heating degree days (HDD) regression for 2016 as .png chart.

2016 Fuel Consumption Data
2016ElectricityGas
MonthConsumed kWh (/d)Generated -kWh (/d)Consumed kWh (/d) PeriodNotes
2016-01 196 (6.3/d) -71 (-2.3/d) 593 (19/d) 20151231T19:20Z to 20160131T17:48Z (31d) Meter readings: electricity generation 71.0kWh, export 45.3kWh, import 169.9kWh (thus net consumption (I+G-E) 195.6kWh); gas ~53.4m^3 (so 593kWh @ 11.1kWh/m^3).
Generation on the first meter passed 21MWh.
HDD12=173 vs 202 last January.
2016-02 160 (5.5/d) -141 (-4.9/d) 561 (19/d) 20160131T17:48Z to 20160229T10:09Z (29d) Meter readings: electricity generation 104.7kWh, export 104.9kWh, import 124.4kWh (thus net consumption (I+G-E) 160.2kWh); gas ~50.5m^3 (so 561kWh @ 11.1kWh/m^3).
HDD12=172 vs 199 last February.
2016-03 180 (5.8/d) -274 (-8.8/d) 497 (16/d) 20160229T10:09Z to 20160331T17:35Z (31d) Meter readings: electricity generation 273.2kWh, export 220.7kWh, import 127.0kWh (thus net consumption (I+G-E) 179.5kWh); gas ~49.7m^3 (so 497kWh @ 11.1kWh/m^3).
Passed 20MWh exports.
HDD12=162 vs 138 last March.
2016-04 143 (4.8/d) -455 (-15/d) 192 (6.4/d) 20160331T17:35Z to 20160430T17:15Z (30d) Meter readings: electricity generation 455.0kWh, export 392.8kWh, import 80.4kWh (thus net consumption (I+G-E) 142.6kWh); gas ~17.3m^3 (so 192kWh @ 11.1kWh/m^3).
HDD12=104 vs 73 last April.
2016-05 147 (4.7/d) -756 (-19/d) 141 (4.6/d) 20160430T17:15Z to 20160531T17:41Z (31d) Meter readings: electricity generation 575.7kWh, export 497.5kWh, import 68.9kWh (thus net consumption (I+G-E) 147.1kWh); gas ~12.7m^3 (so 141kWh @ 11.1kWh/m^3).
Passed 21MWh exports, and 22MWh+6MWh generation on the two meters.
HDD12=23 vs 30 last May.
2016-06 132 (4.4/d) -474 (-16/d) 110 (3.7/d) 20160531T17:41Z to 20160630T16:27Z (30d) Meter readings: electricity generation 474.2kWh, export 404.4kWh, import 62.3kWh (thus net consumption (I+G-E) 132.1kWh); gas ~9.9m^3 (so 110kWh @ 11.1kWh/m^3).
Annual supplier statements state that we are using/importing ~3kWh/d electricity and ~7kWh/d gas on average for the year.
HDD12=2 vs 7 last June and 2 the previous June.
2016 running total (Jan--Jun) 957 (5.3/d) -1990 (-11/d) 2093 (12/d) 20151231T19:20Z to 20160630T16:27Z (182d) Implies total footprint to date -46kgCO2: electricity (average 219W gross) -444kgCO2e @ 0.43kgCO2/kWh (netted), gas 398kgCO2e @ 0.19kgCO2/kWh.
2016-07 135 (4.4/d) -585 (-19/d) 126 (4.0/d) 20160630T16:27Z to 20160731T17:45Z (31d) Meter readings: electricity generation 585.0kWh, export 510.6kWh, import 60.9kWh (thus net consumption (I+G-E) 135.3kWh); gas ~11.3m^3 (so 126kWh @ 11.1kWh/m^3).
HDD12=0 vs 1 last July and 0 the previous July.
2016-08 102 (3.0/d) -563 (-17/d) 75 (2.2/d) 20160731T17:45Z to 20160903T17:46Z (34d) Meter readings: electricity generation 563.0kWh, export 508.8kWh, import 48.1kWh (thus net consumption (I+G-E) 102.3kWh); gas ~6.8m^3 (so 75kWh @ 11.1kWh/m^3).
'Long' month since away on holiday a few days into September. Zero gas use and HDD while away. Electricity use ~1.3kWh/d while away, 50% covered by generation.
Latest Ecotricity projections for our annual imports: e ~1300kWh, g ~3300kWh.
HDD12=0 (calendar month) vs 0 last August and 5 the previous August.
2016-09 132 (4.9/d) -254 (-9.4/d) 103 (3.8/d) 20160903T17:46Z to 20160930T16:43Z (27d) Meter readings: electricity generation 254.4kWh, export 210.4kWh, import 87.9kWh (thus net consumption (I+G-E) 131.9kWh); gas ~9.3m^3 (so 103kWh @ 11.1kWh/m^3).
'Short' month since away on holiday a few days into September.
The load supposedly moved off-grid (~0.3kWh/d) does not seem to have reduced the gross consumption figure.
HDD12=2 (calendar month) vs 14 last September and 5 the previous one.
2016-10 146 (4.7/d) -205 (-6.6/d) 201 (6.5/d) 20160930T16:43Z to 20161031T17:12Z (31d) Meter readings: electricity generation 204.7kWh, export 164.3kWh, import 105.8kWh (thus net consumption (I+G-E) 146.2kWh); gas ~18.1m^3 (so 201kWh @ 11.1kWh/m^3).
Large tree to SE hard-pruned 2016-10-04 and may reduce 0800Z--1000Z grid-tie generation dip from shading (see after) this month and in spring.
Gas consumption higher than last year as OpenTRV on test this month.
HDD12=38 vs 32 last October and 15 the previous one.
2016-11 179 (6.0/d) -88 (-2.9/d) 599 (20/d) 20161031T17:12Z to 20161130T18:12Z (30d) Meter readings: electricity generation 88.4kWh, export 58.8kWh, import 149.1kWh (thus net consumption (I+G-E) 178.7kWh); gas ~54.0m^3 (so 599kWh @ 11.1kWh/m^3).
Lots of messing around with OpenTRV algorithms seems to have increased electricity and gas consumption over and above very cold month.
HDD12=154 vs 63 last November and 79 the previous one.
2016-12 180 (5.8/d) -88 (-1.7/d) 653 (21/d) 20161130T18:12Z to 20161231T18:29Z (31d) Meter readings: electricity generation 53.9kWh, export 32.0kWh, import 157.6kWh (thus net consumption (I+G-E) 179.5kWh); gas ~58.8m^3 (so 653kWh @ 11.1kWh/m^3).
HDD12=160 vs 38 last December and 183 the previous one.
2016 total (Jan--Dec) 1831 (5.00/d) -3739 (-10.2/d) 3851 (10.5/d) 20151231T19:20Z to 20161130T18:12Z (366d) Gas usage up due to cold winter.
Not clear why electricity use up again.
Note that grid electricity carbon intensity dropped significantly again in 2016, which would reduce the benefit of our electricity exports, but previous (0.43kgCO2/kWh) figures will be used for comparison.
kgCO2 787kg (2.2/d) -1608kg (-4.4/d) 732kg (2.0/d) ~-0.09tCO2 (~-0.24kgCO2/d) gas/electricity emissions total for 4 people, based on 0.43kgCO2/kWh for electricity (netted) and 0.19kgCO2/kWh for gas, ie slightly carbon negative.
Note that we haven't flown this year again, we still don't own a car and travel almost entirely by (usually-electrified) public transport.
~911 words.

16WW Energy Stats Summary

A summary of consolidated energy statistics from multiple 16WW data sources.

gas import (gas)

Yearly gas import.

Data as CSV: data/consolidated/energy/std/gas/Y/gas-Y.csv.

Table: yearly gas import; sources: Loop meter; max: 9000
Source: LoopSource: meter
DatekWhkWh
2007*9000unknown cover
20088883+++++++++
20096201++++++
20105784++++++
20113937++++
20123707++++
20133859++++
20142997+++
20152862+++
2016*3267~92% cover3851++++
20173423+++3429+++
20183680++++3806++++
20192888+++3157+++
2020*2077~75% cover2899+++
20213379+++

grid import (imp)

Yearly grid import.

Data as CSV: data/consolidated/energy/std/imp/Y/imp-Y.csv.

Table: yearly grid import; sources: Eddi Enphase meter; max: 9800
Source: EddiSource: EnphaseSource: meter
DatekWhkWhkWh
2005*9800unknown cover
2006*9800unknown cover
2007*6968unknown cover
2008*409~16% cover
2009*403~25% cover
20101220+
20111081+
20121015+
20131108+
20141136+
20151183+
20161242+
20171248+
2018*420~41% cover1187+
2019846914
20209611054+
20219351003+
2022*126~18% cover*297~33% cover

grid export (exp)

Yearly grid export.

Data as CSV: data/consolidated/energy/std/exp/Y/exp-Y.csv.

Table: yearly grid export; sources: Eddi Enphase meter; max: 3491.5
Source: EddiSource: EnphaseSource: meter
DatekWhkWhkWh
2009*148~25% cover
20103044++++++++
20113492++++++++++
20123251+++++++++
20133199+++++++++
20143402+++++++++
20153226+++++++++
20163150+++++++++
20173181+++++++++
2018*693~41% cover3170+++++++++
20192706+++++++2778+++++++
20202627+++++++2722+++++++
20212230++++++2299++++++
2022*251~18% cover*271~33% cover

gross in-home electricity consumption (con)

Yearly gross in-home electricity consumption.

Data as CSV: data/consolidated/energy/std/con/Y/con-Y.csv.

Table: yearly gross in-home electricity consumption; sources: Enphase meter; max: 9700
Source: EnphaseSource: meter
DatekWhkWh
20059700++++++++++
20069700++++++++++
20076968+++++++
20082036++
20091942++
20101554+
20111578+
20121542+
20131659+
20141678+
20151786+
20161831+
20171862+
2018*768~41% cover1998++
20191937+1992++
20202343++2398++
20212119++2205++
2022*927~33% cover

net grid imports (net)

Yearly net grid imports.

Data as CSV: data/consolidated/energy/std/net/Y/net-Y.csv.

Table: yearly net grid imports; sources: synth; max: 254.8
Source: synth
DatekWh
2009*255~25% cover
2010-1830
2011-2406
2012-2279
2013-2089
2014-2266
2015-2043
2016-1908
2017-1933
2018-1984
2019-1854
2020-1700
2021-1352
2022*28~33% cover

total grid-tied PV generation (gen)

Yearly total grid-tied PV generation.

Data as CSV: data/consolidated/energy/std/gen/Y/gen-Y.csv.

Table: yearly total grid-tied PV generation; sources: Enphase meter SunnyBeam; max: 4084.42
Source: EnphaseSource: meterSource: SunnyBeam
DatekWhkWhkWh
2008*915~92% cover*890~85% cover
20092956+++++++2907+++++++
20103547++++++++3483++++++++
20113988+++++++++3922+++++++++
20123778+++++++++3713+++++++++
20133750+++++++++3688+++++++++
20143944+++++++++3882+++++++++
20153829+++++++++3767+++++++++
20163703+++++++++3677+++++++++
20173794+++++++++3737+++++++++
2018*1069~41% cover3928+++++++++3931+++++++++
20193871+++++++++3856+++++++++3801+++++++++
20204084+++++++++4070+++++++++4021+++++++++
20213514++++++++3501++++++++3449++++++++
2022*978~33% cover*973~33% cover*1459~42% cover

off-grid primary PV generation (geno)

Yearly off-grid primary PV generation.

Data as CSV: data/consolidated/energy/std/geno/Y/geno-Y.csv.

Table: yearly off-grid primary PV generation; sources: SSMPPT; max: 99.2
Source: SSMPPT
DatekWh
2016*40.0~38% cover
201799.2++++++++++
201883.0++++++++
201966.7++++++
202062.2++++++
202182.1++++++++
2022*37.8~42% cover

grid-tied battery charge (battc)

Yearly grid-tied battery charge.

Data as CSV: data/consolidated/energy/std/battc/Y/battc-Y.csv.

Table: yearly grid-tied battery charge; sources: Enphase; max: 490.213
Source: Enphase
DatekWh
2018*163~41% cover
2019431++++++++
2020451+++++++++
2021490++++++++++
2022*286~33% cover

grid-tied battery discharge (battd)

Yearly grid-tied battery discharge.

Data as CSV: data/consolidated/energy/std/battd/Y/battd-Y.csv.

Table: yearly grid-tied battery discharge; sources: Enphase; max: 389.84
Source: Enphase
DatekWh
2018*135~41% cover
2019358+++++++++
2020375+++++++++
2021390++++++++++
2022*209~33% cover

DHW heater 1 diversion from PV (h1d)

Yearly DHW heater 1 diversion from PV.

Data as CSV: data/consolidated/energy/std/h1d/Y/h1d-Y.csv.

Table: yearly DHW heater 1 diversion from PV; sources: Eddi; max: 197.532
Source: Eddi
DatekWh
2022*198~18% cover

DHW heater 1 boost from grid (h1b)

Yearly DHW heater 1 boost from grid.

Data as CSV: data/consolidated/energy/std/h1b/Y/h1b-Y.csv.

Table: yearly DHW heater 1 boost from grid; sources: Eddi; max: 14.738
Source: Eddi
DatekWh
2022*14.7~18% cover

DHW heater 1 all (h1)

Yearly DHW heater 1 all.

Data as CSV: data/consolidated/energy/std/h1/Y/h1-Y.csv.

Table: yearly DHW heater 1 all; sources: Eddi; max: 212.27
Source: Eddi
DatekWh
2022*212~18% cover

DHW heater 1 all plus gas (heat)

Yearly DHW heater 1 all plus gas.

Data as CSV: data/consolidated/energy/std/heat/Y/heat-Y.csv.

Table: yearly DHW heater 1 all plus gas; sources: synth; max: 8882
Source: synth
DatekWh
20088882++++++++++
20096203++++++
20105783++++++
20113937++++
20123615++++
20133958++++
20142998+++
20152860+++
20163851++++
20173431+++
20183792++++
20193048+++
20202812+++
20213445+++
2022*1501~27% cover

See 16WW energy series datasets.