API Engineering provides with its engineering services primary national and international engineering companies.

The main customers are the following:

ABB PS&S

ACEA

ALSTOM TRANSPORT SYSTEM

ANAS

ANSALDO ENERGIA SPA

BOMBARDIER SPA

CONSORZIO TURBIGO 800 – MAIRE ENGINEERING TECHINT

CORRIERE DELLO SPORT

DEMONT

ENEL DISTRIBUZIONE

ENEL SPA

FIAT ENGINEERING SPA

GE OIL&GAS NUOVO PIGNONE

GRANSOLAR GHELLA SRL

IG SPA / SPER SPA

INFRASTRUTTURE E GESTIONI SPA

JV ABB–GEMMO

KT SPA

KTI

NUOVO PIGNONE

SAET

SAIPEM SPA

SLOVENSKÉ ELEKTRÁRNE

TECHINT

TECHNIP ITALY

TECNIMONT SPA

TECNIMONT KT

TELELETTRA

TERNA

TERNI ENERGIA