Hey Robin, big fan of this map, congrats on getting front page on HN :).

Two suggestions/questions if you may:

1) Would be good to see how many MW each boundary can handle, not just %? Btw, I can't see the number for the south east england boundary.

2) Great job on the battery info. I'm seeing some battery storage is curtailed. How is that possible? Please don't tell me that we are paying batteries to _not_ export :/?

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robhawkes 6 hours ago | parent [-]

Hey! And thank you

1) Absolutely agree. The current approach for the boundaries is a quick hack until I can implement something more sophisticated. Safe to say an update is already in the works that adds a MW value and more insight into the state of each boundary (and is also more accurate in general)

2) "Please don't tell me that we are paying batteries to _not_ export" – it's actually the opposite, the batteries paid to not export (at least today). You can dig into this yourself via the Detailed System Prices dataset [0] and looking at one of the batteries on the sell stack (eg. KILSB-5)

[0] https://bmrs.elexon.co.uk/detailed-system-prices

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pjc50 6 hours ago | parent [-]

> "Please don't tell me that we are paying batteries to _not_ export" – it's actually the opposite, the batteries paid to not export (at least today).

Unfortunately you've got at least one negative wrong in this sentence and I'm still confused, and the linked dataset is currently blank?

Sorry for complaining, this is a great website!

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robhawkes 6 hours ago | parent [-]

No worries. The Detailed System Prices dataset is lagged by a couple hours so try going back in time.

The simplest answer I can give is that assets place bids and a volume of energy that they are willing to turn down if the system operator needs to. Those bids are either positive or negative in value and this depends a lot on the type of asset, for example wind assets usually bid negative (ie. we pay them to turn down) while gas assets usually bid positive (ie. they pay us to turn down). The reason for that is a lot to do with complexities of the market and also the cost of running that assets, the cost of fuels, etc.

	▲	martinald 4 hours ago \| parent [-]
		Ok, got it I think. So actually the battery operator is paying _the grid_ to turn down output from whatever was previously agreed (because they think they'd get more money for it later?). And this shows as curtailment on the map? Let me know if I'm directionally right here. If I am, it would be good to see 'bad curtailment' vs 'good curtailment' (i assume if bids are negative/positive?)