noun
energy, power
B1
Means 'energy' (physical, personal stamina) and 'power' (output, capability). Commonly used for physical energy, electrical power, or personal drive. Noun feminine: die Energie, plural Energien. Regular declension; genitive singular der Energie. No irregular plural. Often used with für (Energie für etwas) or als Energiequelle.
Examples
Die Anlage liefert genug Energie für die ganze Fabrik.
The plant supplies enough power for the whole factory.
Die Energie in diesem Raum ist spürbar.
You can really feel the energy in this room.
Die Ingenieure berechneten die Energie des Systems, bevor der Test gestartet wurde.
The engineers calculated the energy of the system before the test was started.
Details
Mnemonics
Picture a glowing battery icon labeled 'die Energie' to recall the feminine article.
Sounds like English 'energy' — almost identical, so remember the meaning easily.
Die Energie — think of the -ie ending (like many German feminine nouns such as 'die Biologie').
Notes
Often used both for physical energy and figurative energy (vitality). 'Energie' is usually treated as a mass noun but has a plural 'Energien' when talking about types or forms of energy.