Company

PT. Mastra Mulia Mandiri

A distribution transformer manufacturer in Bandung, West Java, combining experienced engineering, certified quality, and a commitment to Indonesia's electricity infrastructure.

About Us

Company overview

Aerial view of the MASTRA manufacturing facility

PT. Mastra Mulia Mandiri — known by the brand MASTRA — is a distribution transformer manufacturer established in 2018 in Bandung, West Java. The company produces MONTANA-branded distribution transformers — in both oil-immersed and dry-type construction — from 10 to 5,000 kVA.

Though a relatively young company, MASTRA is built on a core team of industry veterans, each with more than twenty years in distribution transformer engineering and manufacturing. Combined with automatic HV/LV winding machines and a fully equipped in-house testing laboratory, this experience allows the company to maintain rigorous quality control at every stage of production while remaining cost-competitive.

MASTRA became a certified PLN vendor in 2019 — a prerequisite for supplying Indonesia's national grid — and began delivering under active contracts to PT. PLN (Persero), the state-owned utility and sole national grid operator, in 2023. Annual production capacity currently stands at 1,500 units.

Our Vision

To be an Indonesian transformer manufacturer recognized internationally for precision, quality, and reliability.

MASTRA aims to be more than a domestic supplier. Our goal is to establish MONTANA as a trusted name in international markets — known for engineering precision, consistent quality, and dependable performance across demanding environments — and to show that Indonesian manufacturing can compete on the global stage, supplying standards-compliant, competitively priced distribution transformers to utilities and industry worldwide.

Our Mission

To support Indonesia's electrification, and to deliver reliable transformers beyond it.

Our mission is to contribute to the development of Indonesia's electricity infrastructure by supplying reliable, standards-compliant distribution transformers to utilities, industry, and infrastructure projects nationwide. We are committed to maintaining the highest production standards, pursuing continuous improvement, and expanding our capabilities to meet the evolving needs of customers at home and abroad.

Company timeline

2018

PT. Mastra Mulia Mandiri established in Bandung, West Java.

2019

Achieved SNI ISO 9001:2015 certification and became a certified PLN vendor.

2023

Began active supply to PT. PLN (Persero); achieved SNI ISO 14001:2015 and SMK3 certification.

Capabilities