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+---
+author: Erik Montnémery
+authorURL: https://github.com/emontnemery
+title: "New sensor state class: total"
+---
+
+A new state class, `total` has been added and the `last_reset` attribute has been
+added back to `SensorEntity` and is no longer deprecated. The driver for the change
+is to support cases where `total_increasing`, which was introduced in Home Assistant
+2021.9, is too restrictive to cover all cases. Note that setting `last_reset` for sensors
+with state class `measurement` is still deprecated.
+
+In addition, the total accumulated increases and decreases are updated together with the
+total accumulated increase and decrease.
+
+### State classes
+
+There are 3 defined state classes:
+
+- `measurement`, the state represents a measurement in present time, for example a
+   temperature, electric power, etc. For supported sensors, statistics of min,
+   max and average sensor readings are updated periodically.
+- `total`, the state represents a total amount that can both increase and
+   decrease, e.g. a net energy meter. When supported, the accumulated growth
+   or decline of the sensor's value since it was first added is updated periodically.
+- `total_increasing`, a monotonically increasing total, e.g. an amount of
+   consumed gas, water or energy. When supported, the accumulated growth of the sensor's
+   value since it was first added is updated periodically.
+
+#### State class `total`
+For sensors with state class `total`, the `last_reset` attribute can
+optionally be set to gain manual control of meter cycles.
+The sensor's state when it's first added to Home Assistant is used as an initial
+zero-point. When a `last_reset` changes, the zero-point will be set to 0.
+If last_reset is not set, the sensor's value when it was first added is used as the
+zero-point when calculating `sum` statistics.
+
+Example of state class `total` without last_reset:
+
+| t                      | state  | sum    | sum_increase | sum_decrease |
+| :--------------------- | -----: | -----: | -----------: | -----------: |
+|   2021-08-01T13:00:00  |  1000  |     0  |           0  |           0  |
+|   2021-08-01T14:00:00  |  1010  |    10  |          10  |           0  |
+|   2021-08-01T15:00:00  |     0  | -1000  |          10  |        1010  |
+|   2021-08-01T16:00:00  |     5  |  -995  |          15  |        1010  |
+
+Example of state class `total` with last_reset:
+
+| t                      | state  | last_reset          | sum    | sum_increase | sum_decrease |
+| :--------------------- | -----: | ------------------- | -----: | -----------: | -----------: |
+|   2021-08-01T13:00:00  |  1000  | 2021-08-01T13:00:00 |     0  |           0  |           0  |
+|   2021-08-01T14:00:00  |  1010  | 2021-08-01T13:00:00 |    10  |          10  |           0  |
+|   2021-08-01T15:00:00  |  1005  | 2021-08-01T13:00:00 |     5  |          10  |           5  |
+|   2021-08-01T16:00:00  |     0  | 2021-09-01T16:00:00 |     5  |          10  |           5  |
+|   2021-08-01T17:00:00  |     5  | 2021-09-01T16:00:00 |    10  |          15  |           5  |
+
+Example of state class `total` where the there initial state at the beginning
+of the new meter cycle is not 0, but 0 is used as zero-point:
+
+| t                      | state  | last_reset          | sum    | sum_increase | sum_decrease |
+| :--------------------- | -----: | ------------------- | -----: | -----------: | -----------: |
+|   2021-08-01T13:00:00  |  1000  | 2021-08-01T13:00:00 |     0  |           0  |           0  |
+|   2021-08-01T14:00:00  |  1010  | 2021-08-01T13:00:00 |    10  |          10  |           0  |
+|   2021-08-01T15:00:00  |  1005  | 2021-08-01T13:00:00 |     5  |          10  |           5  |
+|   2021-08-01T16:00:00  |     5  | 2021-09-01T16:00:00 |    10  |          15  |           5  |
+|   2021-08-01T17:00:00  |    10  | 2021-09-01T16:00:00 |    15  |          20  |           5  |
+
+
+#### State class `total_increasing`
+
+For sensors with state_class `total_increasing`, a decreasing value is
+interpreted as the start of a new meter cycle or the replacement of the meter. It is
+important that the integration ensures that the value cannot erroneously decrease in 
+the case of calculating a value from a sensor with measurement noise present. This state
+class is useful for gas meters, electricity meters, water meters etc.
+
+The sensor's state when it's first added to Home Assistant is used as an initial
+zero-point. When a new meter cycle is detected the zero-point will be set to 0.
+Please refer to the tables below for how this affects the statistics.
+
+Example of state class `total_increasing` with a new meter cycle:
+
+| t                      | state  | sum  | sum_increase | sum_decrease |
+| :--------------------- | -----: | ---: | -----------: | -----------: |
+|   2021-08-01T13:00:00  |  1000  |   0  |           0  |           0  |
+|   2021-08-01T14:00:00  |  1010  |  10  |          10  |           0  |
+|   2021-08-01T15:00:00  |     0  |  10  |          10  |           0  |
+|   2021-08-01T16:00:00  |     5  |  15  |          15  |           0  |
+
+Example of state class `total_increasing` where the there initial state at the beginning
+of the new meter cycle is not 0, but 0 is used as zero-point:
+
+| t                      | state  | sum  | sum_increase | sum_decrease |
+| :--------------------- | -----: | ---: | -----------: | -----------: |
+|   2021-08-01T13:00:00  |  1000  |   0  |           0  |           0  |
+|   2021-08-01T14:00:00  |  1010  |  10  |          10  |           0  |
+|   2021-08-01T15:00:00  |     5  |  15  |          15  |           0  |
+|   2021-08-01T16:00:00  |    10  |  20  |          20  |           0  |