EPC. Engineering, Procurement & Construction Service For these services, GP JOULE can manage the process in different ways, but always as a true and reliable partner: complete turnkey approach or comprehensive technical work packages for engineering & planning, products and installation, plant construction or commissioning for. The end-to-end solution covers all aspects, from technical planning, component procurement, construction, final testing and utility approval. The worry-free turnkey package! This worry-free turnkey package covers all technical aspects and project construction risks away from the developer: foundation design, grid interconnection, site access, trenching, etc.