A renewable-energy power plant including a first structure, a second structure, a first flue, a second flue and a turbine arrangement comprising at least one turbine, wherein the first structure includes a primary fluid inlet and the second structure includes a secondary fluid inlet and a primary fluid outlet, wherein the secondary fluid inlet is connected to the first flue, wherein the primary fluid inlet is located lower than the secondary fluid inlet and the primary fluid outlet is located lower than the secondary fluid inlet, wherein the turbine arrangement is provided inside the second flue, wherein the power plant includes wetting means arranged to discharge an additive fluid to the working fluid passing through the secondary fluid inlet, wherein the turbine arrangement is arranged to generate power due to the working fluid flowing in a downwards direction inside the second flue and passing through the turbine arrangement.

A renewable-energy power plant including a first structure, a second structure, a first flue, a second flue and a turbine arrangement comprising at least one turbine, wherein the first structure includes a primary fluid inlet and the second structure includes a secondary fluid inlet and a primary fluid outlet, wherein the secondary fluid inlet is connected to the first flue, wherein the primary fluid inlet is located lower than the secondary fluid inlet and the primary fluid outlet is located lower than the secondary fluid inlet, wherein the turbine arrangement is provided inside the second flue, wherein the power plant includes wetting means arranged to discharge an additive fluid to the working fluid passing through the secondary fluid inlet, wherein the turbine arrangement is arranged to generate power due to the working fluid flowing in a downwards direction inside the second flue and passing through the turbine arrangement.

The present invention provides a turbine airfoil for relative movement in an ambient fluid, and a turbine apparatus comprising at least one airfoil. The airfoil comprises a main spar having two hill formations and discharge means operable to discharge evaporative and condensing fluids outwardly into the ambient fluid flowing over the main spar. The first of these hill formations accelerates the flow of the ambient fluid until it reaches the speed of sound. After the first hill formation the Mach number continues to increase and the evaporative fluid is discharged into the ambient causing the air to cool which accelerates the ambient flow further and decreases the pressure. On the second hill formation the lower pressure causes a thrust. As the flow moves relative to the second hill formation the Mach number decreases and then increases as it descends the second region. A condensing fluid is discharged causing the water content of the air to condense releasing heat which results in a decrease in Mach number and an increase in pressure. The increased pressure on the second hill formation will produce a thrust which can be used to turn a rotor. The present invention provides an airfoil for producing work and power directly from the moisture in the air. It has no dependence on wind speed and its energy source is directly derived from the always available ambient atmosphere.