GraphQL request returned errors

[fcastilloec]

System Health details

System information

Version	core-2026.3.0
Installation type	Home Assistant OS
Development	false
Supervisor	true
Docker	true
Container architecture	aarch64
User	root
Virtual environment	false
Python version	3.14.2
Operating system family	Linux
Operating system version	6.12.47-haos-raspi
CPU architecture	aarch64
Timezone	America/New_York
Configuration directory	/config

Checklist

• I have enabled debug logging for my installation.
• I have filled out the issue template to the best of my ability.
• This issue only contains 1 issue (if you have multiple issues, open one issue for each issue).
• This issue is not a duplicate issue of any previous issues..

Describe the issue

I just updated to Home Assistant 2026.3.0 and the integration stopped working. I'm not sure if they are related or just a coincidence, but lots of errors are happening.

Reproduction steps

1. Start Home Assistant
2. Integration throws errors

Debug logs

Logger: custom_components.national_grid
Source: helpers/update_coordinator.py:426
integration: National Grid (documentation, issues)
First occurred: March 4, 2026 at 11:55:08 PM (444 occurrences)
Last logged: 12:00:06 PM

Unexpected error fetching national_grid data
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 426, in _async_refresh
    self.data = await self._async_update_data()
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/national_grid/coordinator.py", line 97, in _async_update_data
    data = await self._fetch_all_data()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/national_grid/coordinator.py", line 132, in _fetch_all_data
    await self._fetch_account_data(account_id, today, from_month, data)
  File "/config/custom_components/national_grid/coordinator.py", line 217, in _fetch_account_data
    await self._fetch_ami_data(
    ...<5 lines>...
    )
  File "/config/custom_components/national_grid/coordinator.py", line 317, in _fetch_ami_data
    ami_data = await self.api.get_ami_energy_usages(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<6 lines>...
    )
    ^
  File "/usr/local/lib/python3.14/site-packages/aionatgrid/client.py", line 694, in get_ami_energy_usages
    return extract_ami_energy_usages(response)
  File "/usr/local/lib/python3.14/site-packages/aionatgrid/extractors.py", line 197, in extract_ami_energy_usages
    response.raise_on_errors()
    ~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.14/site-packages/aionatgrid/graphql.py", line 54, in raise_on_errors
    raise ValueError(f"GraphQL errors encountered: {self.errors}")
ValueError: GraphQL errors encountered: [{'message': "Unable to cast object of type 'System.DateTime' to type 'System.Nullable`1[System.DateTimeOffset]'.", 'locations': [{'line': 2, 'column': 9}], 'path': ['amiEnergyUsages'], 'extensions': {'code': 'BadRequest'}}]

Diagnostics dump

No response

[virtitnerd]

It's an issue in aionatgrid.

@RyanMorash , API change I mentioned in RyanMorash/aionatgrid#6

[eanderson143]

2nd

[bob-bloom]

Just installed the integration and receive the same GraphQL error. Should note trying to monitor 4 accounts.

[virtitnerd]

Just installed the integration and receive the same GraphQL error. Should note trying to monitor 4 accounts.

You can switch to the fork of it here https://github.com/virtitnerd/ha_nationalgrid as this project by @RyanMorash has been abandoned