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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorJamster
    • CommentTimeDec 6th 2021
    Morning everyone. I can't see this topic covered elsewhere.

    Has anyone any experience of / is signed up to this from Octopus?


    At the moment, it offers (for my postcode anyway) a significant reduction comparted to most other tariffs. 11 pence / kWh vs I think 23p as it stands. It addition, any PV export is bought at 11 p/kWh also. Based on our energy use this would save us ~£1700 / year. I know this is high - in my defence, we're electric only, ASHP but other non-trivial parasitic loads that aren't really reducible. Anyway, that's not what I wanted to ask / flag up.

    Its Powerwall owners only, and you in effect sign over management of the unit to Tesla / Octopus for use as a distributed grid-tied battery in exchange for those prices. I also appreciate the economics are probably a bit skewed at the moment with the surge in energy cost. Are there other drawbacks to this scheme? Tesla seem to warranty their battery capacity against capacity loss following repeated charge / discharge and I would imagine any management system would not want to endanger that.

    The other point is any assessment of break-even points, etc assumes these prices remain fixed long-term. At the months its 12-months vs what's likely to be 6 years to break even at a very rough estimate.

    If we went for this, it would be financed through a loan not savings - the repayments would be ~ the same as our savings so to my simplistic mind this is in essence a 'free' battery unit when measured over the medium term.

    What do people think? Our PV installer suggests there's a big old lead-time on Powerwall orders so it might be academic anyway, but the offer might be useful to forum users with a powerwall too.
    • CommentAuthordickster
    • CommentTimeDec 6th 2021
    All going swimmingly here. Use Ecotricity, have Tesla Powerwall x 2, BUT

    Can't use Octopus 'cause can't have a smart meter fitted (no mobile signal) Ah well....
    • CommentAuthorrevor
    • CommentTimeDec 6th 2021
    Being a low risk person It would not be for me. I am averse to anyone having control over my assets. It is so uncertain for the future. Companies will see that your batteries and agreement with Octopus/tesla as an asset that can be traded. Some company somewhere may come along and make an offer to Octopus/Tesla for that part of the business and terms can change. I think a lot will depend on the small print in the agreement between the asset owner and Octopus /Tesla. Think of the issues there have been with householders not owning the panels on their roof albeit it not being quite the same as the discussion you have raised.
    • CommentAuthorJamster
    • CommentTimeDec 16th 2021
    Thanks both.

    Revor - from what I can see, you hand over control of your battery for the duration of the tariff term - so it would be a year for the current offer - but I think you get to retain a proportion of the charge capacity for your own use. Anyway, somewhat academic - I was talking to our PV installer (SolarEdge Inverter failed so replaced under warranty) who understands Powerwalls are like rocking horse poo at the moment.
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