©ELISA technology uses a gravity foundation (GBS) for marine wind power, configured to act as a floating platform to enable the substructure and wind turbine (WTG) to be installed together. Each complete unit — the GBS and the WTG — is fully assembled on land and then towed conventionally to the final site, where it is installed using low-cost means (tugboats). The ©TIM platform is used to assure a high degree of stability throughout the towing and ballasting process. It can be coupled firmly to the concrete GBS shaft to hold them together while afloat.

If a vessel with a Jack-up platform is available at a competitive price, ELI technology is a competitive alternative. The ELI concept maintains the gravity foundation designed to act as a floating platform and the first section of the tower at the access-platform level. It is also installed with a small-scale ©TIM in order to optimise the use of materials for the foundation. In this case, the steel tower and the WTG are installed in the conventional way with a vessel equipped with a jack-up platform.

©ELI and ©ELISA provide a viable substructure system for a wide variety of marine wind farms in deep waters (15–70 m), particularly in certain specific conditions such as a rocky sea bed or in emerging markets where the supply chain is not fully established.