De or het basisinspanning?

The correct Dutch article is:

de basisinspanning

Rule Words ending in -ing: almost always de. See the rule

How to use basisinspanning

the basisinspanningde basisinspanning
this basisinspanningdeze basisinspanning
that basisinspanningdie basisinspanning
our basisinspanningonze basisinspanning
your basisinspanningjouw basisinspanning
every basisinspanningelke basisinspanning
which basisinspanning?welke basisinspanning?
a big basisinspanning / the big basisinspanningeen grote basisinspanning, de grote basisinspanning