Usability of traditional financial investment models in sustainable (innovative) business decisions: Sustainable Investment Model (SIM) for off-shore wind farms.Traditional financial models (e.g. capital budgeting theory) applied in sustainable business decisions for off-shore wind farm projects. The success of innovation rests on technology, market development and on developing and creating access to financial resources. The latter should be detailed in a thorough business case including an investment model.There are specialised publications in the field of Finance (Ross et all and Eiteman et all), Management Accounting (Horngren et all), Project Finance (Yescombe) and Engineering of Wind Turbines / Wind Farms (Krohn and Twidell et all), but not an integrated approach: To bridge the gaps between Engineering, Marketing, Financing and Managing investment in sustainable business innovations for the off-shore wind farms.