Does HPS build substation transformers?

Frequently Asked Questions MV Transformers 

Substation transformers are located outside and typically range from 750 kVA to 5000 kVA single-phase and 25,000 kVA three-phase. The Primary voltage ranges from 2400 VAC to 46,000 and the secondary from 480 VAC to 15,000 VAC. Taps are typically manually changed while the unit is de-energized.

While they are typically oil, HPS dry-type transformers can offer similar performance with a lighter weight and fewer environmental concerns.