Counting Watt usage of Tasmota Devices

Configuration
2

Adapting this: How to automatically include and sum the values of multiple Utility Meter Sensors

Gives you:

      value_template: >
        {% set ns = namespace(states=[]) %}
        {% for s in states.sensor %}
          {% if s.object_id.endswith('_energy_power') %}
            {% set ns.states = ns.states + [ s.state | float ] %}
          {% endif %}
        {% endfor %}
        {{ ns.states | sum }}