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All industries › Glossary › Mechanical completion

Glossary

Mechanical completion

Also: substantial completion

The point where everything is installed and ready for testing, before the plant is energized and starts commercial operation.

Mechanical completion is the builder's milestone: all equipment is installed and connected, and commissioning can begin. Testing, energizing and the grid operator's checks follow before the commercial operation date.

For trades, it marks the end of most field work; for commissioning, testing and operations firms it is the start.

Related terms

Commercial operation dateThe date a power project starts selling power; developers' projected CODs in the queue run late more often than not.EPC contractorThe company that designs, buys the equipment for and builds a power project under one contract: the builder, and the one who hires the trades.
Every term Utility solar projects Data center projects

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