überschüssig
excess
Present in a larger amount than is needed or used. It describes a surplus or remainder.
Die überschüssige Energie wird in großen Batterien gespeichert.
The excess energy is stored in large batteries.

excess
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excess
Present in a larger amount than is needed or used. It describes a surplus or remainder.
Die überschüssige Energie wird in großen Batterien gespeichert.
The excess energy is stored in large batteries.

'Überschüssig' (excess) is the adjective corresponding to the noun 'der Überschuss' (surplus/excess). Both words describe an amount that is greater than what is needed.
Der finanzielle Überschuss wird in neue Projekte investiert.
The financial surplus is invested in new projects.
The adjective is often used in economic, technical, or nutrition-related contexts. Typical combinations are: überschüssige Energie (excess energy), überschüssige Waren (excess goods), or überschüssige Kalorien (excess calories).
Die Firma verkauft die überschüssigen Produkte zu einem reduzierten Preis.
The company sells the excess products at a reduced price.
The word does not simply describe a large amount, but specifically the amount that remains after a need has been met. It refers to the remainder that was not used.
Nachdem alle Rechnungen bezahlt waren, wurde das überschüssige Geld gespart.
After all the bills had been paid, the excess money was saved.
scarce / just under / close
'knapp' and 'überschüssig' are opposites when it comes to quantities. 'Knapp' means that only a small amount is available and it may just barely be enough. 'Überschüssig' means that there is more than you need. When supplies are scarce, you have to save or plan carefully. Excess things are left over and can be passed on, stored, or disposed of.

Nach der Feier hat Herr Meier das überschüssige Essen an die Nachbarn verteilt.
After the party, Mr. Meier gave the excess food to the neighbors.
Wenn die Plätze im Zug knapp sind, sollten wir früh reservieren.
If seats on the train are scarce, we should reserve early.