Sähköissä
Sähköissä is the inessive plural form of the Finnish noun sähkö, meaning electricity. The word denotes location or presence inside electricity or within electrical environments. In everyday language the form is uncommon, but it appears in linguistic discussions, terminology related to electrical phenomena, and certain technical writings.
Grammatically, sähkö is a feminine noun that inflects for case and number. The inessive case expresses “in”
Usage notes indicate that sähköissä is rarely needed in common conversation. More typical expressions describe locations
In linguistic terms, sähköissä illustrates how Finnish uses the inessive plural to mark location within a collective