1. European distribution transformer population

The population of distribution transformers in Europe is about 4,5 million units. The annual market; new investments and replacement, is estimated at about 3% of existing stock of units.

The overall population of EU-25 utility distribution transformers is estimated at 3,6 million units. Table and the figure below present the utility summary on EU-25 countries and Norway. Both the number of installed transformers and their average rating is given. Population of privately owned (usually referred to as industrial) oil filled distribution transformers installed in EU-25 is estimated at 800 thousand units with 400 kVA average transformer rating. The number of privately owned dry type transformers is estimated at less than 200 thousand units but the average rating is more than double of oil private fleet i.e. slightly more than 800 kVA.

Next figure presents the transformer size (ratings) in kVA relative distribution in population. All three sectors; utility, industry oil filled and industry dry type are covered. It is visible that utilities operate lower ratings especially in rural areas while industry and particularly dry type transformers have much higher ratings in average.