I’ve made a start on an emoncms app for exploring the cost implications of the Octopus Agile time of use tariff available in the UK.
You may have seen @Zarch’s forum post and website that also allows for exploring historic agile costs as well as the Octopus Go tariff: My Octopus Agile & Go Tariff comparison / analysis website we are also using the agile tariff for the DemandShaper module and DSR development: OpenEnergyMonitor Demand Side Response Development
The emoncms app allows for selection of the relevant tariff region and shows the cost for the selected period at the bottom of the graph window. The app calculates for every half hour in the view the cost based on consumption x unit cost.
I’ve pushed the app up to the apps module in both master and stable branches: https://github.com/emoncms/app/blob/master/apps/OpenEnergyMonitor/octopus/octopus.php
To test the app:
- Run emonpi/emonbase update to pull in the latest version of the apps module.
- Click on Apps > New to bring up the list of available apps.
- Click on the Octopus Agile app
- In the app config: select your use and cumulative use_kwh feed (same as my electric).
- In the app config: select your tariff region
- Launch app to view the result
At present you can only see a maximum of 2 months at one time, this is because of the maximum number of data point limit in the feed/data API. Id like to make it possible to process say a full year of data to see the results over an extended time. Id also like to include the octopus go tariff for comparison.
Part of the motivation for putting this together was that I wanted to check what kind of cost I’d be looking at before making the switch to the agile tariff and I’m pleasantly surprised how low the average unit cost is for my consumption pattern (including a heat pump an EV). I’ve been conscious of need to shift as much as I can to off-peak times already from a grid perspective, but still I am currently on a flat tariff so the financial incentive is not there - I imagine Id be able to do a bit better with the additional nudge…
Here are a couple of screenshots showing examples of what I see and how the price changes winter through to summer:
Last 24 hours:
Last 7 days:
Last 30 days:
Jan - Feb 2019: