Spotlight on a specialised SME undergoing significant and sustained growth
A unique journey, a distinctive positioning, and bold ambitions.
Founded 25 years ago in Brest, ACEPP is a recognised service provider in the Naval and Nuclear industries. Acquired in 2017 by Lyon-based HEVERETT Group, this mid-sized company (ETI) now has 300 employees and nearly €20M in revenue.
ACEPP specialises in handover to operators and operational maintenance (MCO), standing out through its mastery of complex infrastructure — nuclear sites, naval bases, and warships.
Its core strengths include project coordination (PMO/OPC), maintenance engineering, testing, and operating complex systems such as nuclear reactors.
Historically rooted in naval and infrastructure work, ACEPP has expanded into nuclear engineering, partnering with key clients such as TechnicAtome, CEA, and ORANO.
Under the strategic leadership of Thomas Guerry, a former nuclear submarine commander and shipyard director, ACEPP has dramatically enhanced its naval activities since 2022.
Clients include: Naval Group, Chantiers de l’Atlantique, CNIM SI, ArianeGroup, and CMN.
Commercial ties are strengthening, and visibility is increasing as trust builds across the sector.