Develop an innovative architectural vision for the new US Embassy in Tallinn, Estonia, characterized by a striking exterior design incorporating a curved double-skin facade with a downward slope, accentuated by concrete elements for structural robustness and contemporary flair. Enhance the ambiance by surrounding the building with a tranquil moat of water, symbolizing security and serenity. Additionally, integrate a wind turbine wall atop the roof to showcase the embassy's commitment to sustainability. Consider how this amalgamation of concrete, water features, and renewable energy aligns with the values of the United States while complementing Tallinn's architectural context.