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Fix StorageScheduler crash on devices without sensor in flex-model #2085

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Fix StorageScheduler crash on devices without sensor in flex-model #2085

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2 changes: 1 addition & 1 deletion documentation/changelog.rst
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Expand Up @@ -35,7 +35,7 @@ Infrastructure / Support

Bugfixes
-----------

* Fix ``StorageScheduler`` crash (``AttributeError: 'NoneType' object has no attribute 'event_resolution'``) when scheduling a site whose asset tree contains non-storage devices with only a ``power-capacity`` in their ``flex-model`` (no ``sensor`` key) [see `issue #2084 <https://github.com/FlexMeasures/flexmeasures/issues/2084>`_]

v0.31.2 | March 18, 2026
============================
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2 changes: 1 addition & 1 deletion flexmeasures/data/models/planning/storage.py
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Expand Up @@ -899,7 +899,7 @@ def _prepare(self, skip_validation: bool = False) -> tuple: # noqa: C901
device_constraints[d]["efficiency"] = storage_efficiency[d]

# Convert efficiency from sensor resolution to scheduling resolution
if sensor_d.event_resolution != timedelta(0):
if sensor_d is not None and sensor_d.event_resolution != timedelta(0):
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@Flix6x Flix6x Apr 2, 2026

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I'm thinking of the case where the power sensor of the device is not mentioned in the flex-model of the API trigger message, but the device does have a storage-efficiency defined on the db flex-model.

The storage-efficiency will then become interpreted with respect to the scheduling resolution rather than the device's own power sensor resolution, and requesting the schedule in a different resolution would result in a different interpretation of the storage-efficiency over time.

This is a known shortcoming of our current implementation of the storage-efficiency (see #720), but your solution appears to me it might amplify the problem.

Four possible remedies I see going forward:

  1. Resolve Storage efficiency notation per any time unit. #720
  2. Keep requiring a sensor, but make it possible to define a power sensor in the db flex-model.
  3. If a storage-efficiency is defined in the db flex-model, and the corresponding power sensor is missing, throw a ValidationError.
  4. We document this shortcoming, for instance, in scheduling.rst under the storage-efficiency footnote, and move forward.

I'm assuming your device doesn't have a storage-efficiency, is that correct? Then 3 or 4 seem like a reasonable quick fix to me. Would you agree?

1 and/or 2 are the more long-term solutions, but they for sure require more work and whoever works on them might encounter complications along the way.

device_constraints[d]["efficiency"] **= (
resolution / sensor_d.event_resolution
)
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