Earth Notes: 16WW Electricity Profiles

Updated 2025-09-10.
16WW grid import and export and other electricity hour-of-day flows. #stats #loadProfile
Most of us in the UK still pay the same for a unit of electricity at home whenever we consume it, possibly because we are not yet on a smart meter that can report when energy is used. But that neither reflects the wholesale costs nor energy availability, especially with more renewables in a greener grid. See how 16WW uses (consumes, generates, imports and exports) electricity through the day, and how that varies with the seasons.

Live PV Generation Profile

Live charts for on- and off- grid PV.

16WW live grid-tie generation
LIVE 16WW grid-tied PV generation.
16WW live off-grid generation and consumption
LIVE 16WW off-grid PV generation and consumption.

2020: Corona Times

As explored in Statscast for 2020-12 - Load Profile we spilled a lot of energy to the grid in summer, especially near noon. We covered relatively little of our use from PV in winter, not even enough to stay off grid overnight as we do in summer.

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In June 16WW can be seen almost never to import on average, and to be a significant net exporter. Night loads such as the fridge-freezer are covered by the battery. Note that Enphase times are local, ie BST or UTC+1 here. (Chart data CSV file.)
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This load profile for 16WW is for the initial 21 'normal-ish' days of December 2020. This shows both gross consumption as if there were neither PV nor battery, and net consumption from the grid after the effect of those two. ~10% mean is clipped from peak grid net imports by the battery. Sunset is a little before 4pm for this period. (Chart data CSV file.) This is derived from Enphase 15-minute "Monthly Net Energy" data. Note that the Enphase has been set up with a nominal peak-rate setting on weekdays only to cover the 'peak' peaks, from 4pm to 6:59pm, and the central heating boiler is disabled during the same interval, to help reduce grid imports then.

2024-12: Load Profile with Heat Pump

2024-12: first full month

A quick check if our electricity load profile has significantly changed since , given the new heat pump and some DHW/CH load shifting tweaks, using data for the first 19 full days in December, with extended scripts.

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Load profile over to inclusive, gross and net/imported. DHW consumption spikes starting at and are clearly visible, demonstrating an ability to load shift. Data and other views are available.

A re-run on for the whole of , messed up as it is by the holiday season and various faults/reconfigurations, was made with sh script/storesim/load_profile.sh 202412.

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Load profile over whole of . Data and other views are available.

Hourly hph4 heat pump consumption for the whole of was made with sh script/storesim/load_profile.sh -hph4 202412.

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Heat pump (hph4) load profile over whole of . Demand is indeed being steered away from to .

Hourly eheat heat pump consumption plus diversion/boost (boost is pasteurisation) for the whole of was made with sh script/storesim/load_profile.sh -eheat 202412.

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Heat pump plus diversion/boost (eheat) to capture pasteurisation cycles over whole of .

2025-01: coldest month this winter

Hourly eheat heat pump consumption plus diversion/boost (boost is pasteurisation) for to inclusive (final heat-pump fixes were made ) was made with sh script/storesim/load_profile.sh -eheat 202501-01to22.

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Heat pump plus diversion/boost (eheat) to capture pasteurisation cycles over to inclusive, which included some 'design day' outside temperatures around -2°C. (Improved plot style.) Data and other views are available.

Weekday 15-minute con consumption and net imports for .

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Weekday gross consumption and net grid flows for when peak demand (maximum often close to ) is higher and demand response is more useful. Demand is being steered away from . Data and other views are available.

2025-02: full data again

No more data losses from the Eddi (or anything else), so a full dataset...

Hourly hph4 heat pump consumption alone for was made with sh script/storesim/load_profile.sh -hph4 202502.

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Heat pump (hph4) so excluding PV diversion and from-grid pasteurisation boost . Data and other views are available.

Full-week 15-minute con consumption and net imports for generated with sh script/storesim/load_profile.sh 202502.

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Full-week gross consumption and net grid flows for . Times UTC. Data and other views are available.

2025-03: sunny around the equinox

Note: all times UTC/GMT.

Hourly hph4 heat pump consumption alone for a rather sunny (with space heat going off mid-month and various DHW changes and much diversion) was made with sh script/storesim/load_profile.sh -hph4 202503.

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Heat pump (hph4) so excluding PV diversion and from-grid pasteurisation boost . Data and other views are available.

Hourly eheat heat pump consumption plus diversion/boost (boost is pasteurisation) for a rather sunny (with space heat going off mid-month and various DHW changes and much diversion) was made with sh script/storesim/load_profile.sh -eheat 202503.

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Heat pump plus diversion/boost (eheat) to capture pasteurisation cycles over . Data and other views are available.

Weekday 15-minute con consumption and net imports for generated with sh script/storesim/load_profile.sh 202503.

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Weekday gross consumption and net grid flows for . Data and other views are available.
202503 imports and exports seen by Eddi
grid imports and exports as measured by the Eddi.

2025-04: also sunny

Note: all times UTC/GMT.

Hourly hph4 minimal heat pump consumption alone for an unusually sunny was made with sh script/storesim/load_profile.sh -hph4 202504.

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Heat pump (hph4) so excluding PV diversion and from-grid pasteurisation boost . Data and other views are available.

Hourly eheat minimal heat pump consumption and no boost, with almost all DHW from diversion for was made with sh script/storesim/load_profile.sh -eheat 202504.

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Heat pump plus diversion/boost (eheat) to capture pasteurisation cycles over . Data and other views are available.

Weekday 15-minute con consumption and net imports for generated with sh script/storesim/load_profile.sh 202504.

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Weekday gross consumption and net grid flows for . The peak on the right is the evening meal being cooked. Data and other views are available.
202504 imports and exports seen by Eddi
grid imports and exports as measured by the Eddi.

2025-05: heat pump DHW FTW

Hourly eheat chart for the first week of the DHW loss-minimisation scheme, from , was made with sh script/storesim/load_profile.sh -eheat 202505-15to21.

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Heat pump plus diversion/boost (eheat) to capture new DHW control over / inclusive. The purple side lobes (all chart times UTC) are heat pump operation to counteract losses and residual use from the DHW cylinder; the middle hump is diversion top-up of the heat battery. Diversion to the cylinder is suppressed. No imports are needed to cover DHW production. Peak spill to grid is still slightly after solar noon, as aimed for. Data and other views are available.

Full-week 15-minute con consumption and net imports for generated with sh script/storesim/load_profile.sh 202505.

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Full-week gross consumption and net grid flows for . Times local, BST, UTC+1. Data and other views are available.

2025-06: Summer

Initial first (nearly) three days of delaying some diversion until after solar noon as hourly con consumption and net imports from to generated with sh script/storesim/load_profile.sh 202506-14to16-part.

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Three-day diversion-shifting snapshot of gross consumption and net grid flows from . Times now UTC. Data and other views are available.
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15-day diversion-shifting snapshot of eheat (electricity for heat) and net grid flows from . Times UTC. Data and other views are available.

Throughout this period, the consumption peaks are:

Z
Heat pump DHW
Z
Peak solar DHW diversion
Z
Cooking for evening meal
~Z
Heat pump DHW (was pushed back a little)

Full-week 15-minute con consumption and net imports for generated with sh script/storesim/load_profile.sh 202506.

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Full-week gross consumption and net grid flows for . Times UTC. Data and other views are available. (Note: more compact SVG vector graph format as of .)

Full-week 15-minute con consumption and net imports for generated with sh script/storesim/load_profile.sh 202507.

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Full-week gross consumption and net grid flows for . Times UTC. Data and other views are available. (Note: more compact SVG vector graph format as of .)

Full-week 15-minute con consumption and net imports for generated with sh script/storesim/load_profile.sh 202508.

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Full-week gross consumption and net grid flows for . Times UTC. Data and other views are available. (Note: more compact SVG vector graph format as of .)