Bath Iron Works (BIW) represents a significant but smaller portion of Maine’s economy than some reports suggest. Contrary to claims that the shipyard accounts for about 17% of the state’s gross domestic product (GDP), a detailed review reveals that its direct contribution aligns with approximately 1.6% of Maine’s total GDP.
The confusion arises from mixing different economic measures. In December 2022, a BIW press release cited a study showing the shipyard accounted for 17% of Maine’s “production GDP” in 2021. Production GDP measures only the value of goods produced within manufacturing and excludes services and other sectors, so it does not represent the entire economy. The release did not state that BIW constituted 17% of Maine’s total GDP, yet the figure circulated broadly.
A November 2024 economic report estimates BIW’s statewide impact at $2.55 billion in economic output. This figure includes direct shipyard activity, supplier purchases, and employee spending. However, economic output differs from GDP because it also accounts for intermediate goods and services purchased by the firm, which GDP excludes to prevent double counting.
When focusing on value added, the measure comparable to GDP, BIW’s contribution comes to $1.28 billion, or roughly 1.6% of the state’s total GDP. This aligns BIW as a sizable but not dominant player in Maine’s economy. The shipyard employed 6,722 workers in 2023, representing about 12.4% of Maine’s manufacturing workforce, underscoring its role as a major regional employer.
This clarification emerges amid public discussions and misinformation about the shipyard’s economic footprint. Bath Iron Works remains an important anchor in Maine’s industrial landscape, but its economic share must be understood correctly within the appropriate metrics and definitions.