| Subject | English | Maltese |
| energ.ind. | hydro-electric plant | impjant idroelettriku |
| energ.ind. | hydro-electric power plant | impjant idroelettriku |
| energ.ind. | hydro-electric power station | impjant idroelettriku |
| min.prod., energ.ind., mining. | hydro-frac | fratturazzjoni idrawlika |
| min.prod., energ.ind., mining. | hydro-fracturing | fratturazzjoni idrawlika |
| IT, environ., geogr. | hydro node | nodu idrografiku |
| IT, environ., geogr. | hydro node | nodu idro |
| environ., geogr. | hydro point of interest | punt ta' interess idro |
| el., tech. | hydro power plant | impjant tal-enerġija idro |