I have regulary updating estimated yearly Power Consumption of various Deviced. Now i want to show
a) The sum of all devices
b) show its difference to the Value 24h ago
I could do it with massive use of variables, but im pretty sure that is the most unprofessional and hard to maintain Way 
a) can i sum up all Devices with wildcards, e.g. sum(sensor.tasmota*.yearlykwh) in a Template?
b) how can i most easy access the value/state it had 24h ago?
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