Add Nordpool tariff api

[andig]

Fix #17464
Fix #17479
Fix #17580

Replace #17607

[RTTTC]

Have tried to configure this in UI, without success. (0.131.9)
Could you please post a sample config for UI ?

[andig]

without success

That's pretty unspecific ;)

[RTTTC]

Well, I have assumed that it was my configuration mistake..
(I have simply replaced elering with nordpool in my UI config)
Thats why I have asked for config sample - since nothing in the documentation yet.

[andig]

https://docs.evcc.io/docs/devices/tariffs#nordpool-spot-prices

[RTTTC]

Thank you.
(The link in UI "Tariffs" configuration seems to link to a wrong place then ? https://docs.evcc.io/en/docs/reference/configuration/tariffs )

[RTTTC]

There is something wrong with unit conversion, as currently it shows value that is 1000 times too large.
Current Nordpool price is 200.04 EUR/MW
At the same time evcc shows it as 20,004.0 ct

[RTTTC]

Also charges and tax seems to be messed up, not sure if it is related to 1000x or something else is wrong, I was unable to comprehend this.

[Millox]

See
#17702

pricing downloaded from Nordpool is in EUR/MWh but evcc expects it to be EUR/kWh (or other currency)

[RTTTC]

Thank you all, now everything works nicely! 😎

[Millox]

No, it doesn't. I have unfortunately been unable to determine where to change the code. If the json body of the http request is empty the error is returned "unexpected end of JSON" which is due to the empty string returned. This happens between 00:00 and 13:00 every day. During this time it is not possible to start evcc, and if it is running the tariff and pricing is unavailable.

I will try to fix it, but if I'm unsuccessful tomorrow I will submit a bugreport, unless anyone could give me a tip on where to look for the parsing function.

[RTTTC]

Tested after midnight, same error, planner: tariff not available: cannot create tariff type 'template': cannot create tariff type 'custom': unexpected end of JSON input
For me evcc started OK despite the error ( no planner pricing data present )

[andig]

This needs a trace log, preferable inclusing http headers

[Millox]

I've added a few traces to try to pinpoint the fault, but I was only able to find that it comes from the forecastG-function in tariff/tariff.go

s, err := forecastG()

And this function is retrieved from the registry
https://github.com/evcc-io/evcc/blob/d4cb42f78121af1129c12aee2b3326f6521d10b5/tariff/tariff.go#L69C3-L69C73

but I was unable to determine where it was actually defined.

See trace:

[feedin] TRACE 2024/12/14 07:29:29 GET https://dataportal-api.nordpoolgroup.com/api/DayAheadPrices?market=DayAhead&date=2024-12-15&deliveryArea=SE4&currency=SEK
[grid  ] TRACE 2024/12/14 07:29:29 GET https://dataportal-api.nordpoolgroup.com/api/DayAheadPrices?market=DayAhead&date=2024-12-15&deliveryArea=SE4&currency=SEK
[tariff] TRACE 2024/12/14 07:29:29 forecastG() returned "",%!w(*fmt.wrapError=&fmt.wrapError{msg:"tomorrow: unexpected end of JSON input", err:(*backoff.PermanentError)(0xc002049de0)})
[tariff] TRACE 2024/12/14 07:29:29 backoffPermanentError(&fmt.wrapError{msg:"tomorrow: unexpected end of JSON input", err:(*backoff.PermanentError)(0xc002049de0)}) : unexpected end of JSON input
[tariff] ERROR 2024/12/14 07:29:29 unexpected end of JSON input
[main  ] ERROR 2024/12/14 07:29:29 creating tariff grid failed: cannot create tariff type 'template': cannot create tariff type 'custom': unexpected end of JSON input
[tariff] TRACE 2024/12/14 07:29:29 forecastG() returned "",%!w(*fmt.wrapError=&fmt.wrapError{msg:"tomorrow: unexpected end of JSON input", err:(*backoff.PermanentError)(0xc001d02380)})
[tariff] TRACE 2024/12/14 07:29:29 backoffPermanentError(&fmt.wrapError{msg:"tomorrow: unexpected end of JSON input", err:(*backoff.PermanentError)(0xc001d02380)}) : unexpected end of JSON input
[tariff] ERROR 2024/12/14 07:29:29 unexpected end of JSON input
[main  ] ERROR 2024/12/14 07:29:29 creating tariff feedin failed: cannot create tariff type 'template': cannot create tariff type 'custom': unexpected end of JSON input
grid:
[main  ] FATAL 2024/12/14 07:29:29 tariff not available: cannot create tariff type 'template': cannot create tariff type 'custom': unexpected end of JSON input
)

I added two traces to the code in tariff/tariff.go

                if err := backoff.Retry(func() error {
                        s, err := forecastG()
                        t.log.TRACE.Printf("forecastG() returned \"%s\",%#w",s,err)
                        if err != nil {
                                t.log.TRACE.Printf("backoffPermanentError(%#v) : %v",err,errors.Unwrap(err))
                                return backoffPermanentError(err)
                        }

But as I said above, the func forecastG() comes from the registry and I can't seem to find where it is actually defined.

[RTTTC]

Any progress with this issue ?

[andig]

Please open issue with trace log.