Integrated Design & Engineering Holdings Co., Ltd.

Integrated Design & Engineering Holdings (ID&E Holdings) is the parent company of Nippon Koei, which continues to play a central role within the group.

Since our founding as Nippon Koei in 1946, the ID&E Group has been guided by a single mission: Make the World a Better Place.

Through our three core business areas—Consulting, Urban & Spatial Development, and Energy—we deliver comprehensive solutions worldwide, from infrastructure planning and design to urban development and power systems operation.

Today, over 6,700 specialists work on projects in more than 160 countries. They bring expertise and innovation to nation-building and community development around the world.

In 2025, we joined the Tokio Marine Group, marking the beginning of a new chapter. By integrating our engineering expertise with the strengths of one of the world's leading insurance groups, we are committed to building a more effective and resilient society—from disaster prevention to comprehensive risk management.