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| English | Russian |
| primary energy coefficient | коэффициент первичной энергии (25banderlog) |
| primary energy production | первичная энергетика (igisheva) |
| primary frequency control | первичное регулирование частоты (MichaelBurov) |
| primary frequency reserve | резерв первичного регулирования частоты (Therefore a closer operation to the maximum efficiency point can be realized while the whole primary frequency response reserve is being preserved.  so-ups.ru rafail) |
| primary technology | основная технология (ssn) |