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Octopus Energy Saving Sessions

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Does anyone know how the Octopus ”Power Hour” energy saving sessions are actually calculated?

I’ve taken part in all of them, but the results just seem totally random.

I’ve had sessions where we’ve switched off as much as we can and gone out, only to be told that we didn’t manage to save anything.

Some sessions, we’ve made very small savings, Including one where virtually everything was switched off and the whole family was in another country.

One session I forgot it was happening despite signing up, only to be told I’d managed to save 93% of my normal usage and be credited with over £16 off!

I’ll continue to sign up for them and don’t really do it expecting to save much as we are already quite energy efficient. It all just seems so random.
 
my first test hopefully with GivBack. Worst case I'll have shoved 4kwh down the pan and I'll run the rest of the evening on fumes.

Did GivBack say they'll also cover the value of the peak rate if they charge the battery in advance? or is that factored into the export rate they offer? Although its fairly sunny tomorrow so the battery should be ok. Just need to keep the wife away from the tumble dryer
 
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If I can get our setup exporting at 5kW for 1.5 hours (7.5 kWh)... that'll be £30 credit back.

Definitely worth doing as that'll buy back 400 kWh for free at 7.5p rate.

Unless I've got this all horribly wrong?
🤞that’s what I’m hoping for. I only recently got the export battery power option for my Powerwall so hoping I get it set up right by temporarily tweaking my rates in time of use settings so that it exports battery power.
 
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