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Some embodiments of a turbine system described herein provide a turbine that rotates in response to off-axis fluid flow, such as water flowing in a generally horizontal direction that is generally perpendicular to a vertical axis of rotation. The rotation of the turbine can drive a generator to outp

Some embodiments of a turbine system described herein provide a turbine that rotates in response to off-axis fluid flow, such as water flowing in a generally horizontal direction that is generally perpendicular to a vertical axis of rotation. The rotation of the turbine can drive a generator to output electrical energy.

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1. A turbine for use in an electrical generation system, comprising: a vertical-axis turbine that rotates about a vertical axis in response to fluid flowing toward the turbine in a flow direction that is generally perpendicular to the vertical axis;the vertical-axis turbine including: a central uppe

1. A turbine for use in an electrical generation system, comprising: a vertical-axis turbine that rotates about a vertical axis in response to fluid flowing toward the turbine in a flow direction that is generally perpendicular to the vertical axis;the vertical-axis turbine including: a central upper dome surface at least partially defined by an upwardly convex curve in a vertical cross-sectional plane, and a plurality of upwardly protruding fins that each extend from an outer region proximate to an outer periphery of the vertical-axis turbine toward the central upper dome surface, wherein each of the fins include a convex face and an oppositely disposed concave face that intersect at a curved upper ridge,wherein both the convex face and the concave face of each upwardly protruding fin are upwardly facing surfaces,wherein each of the fins terminates at a vertical height below an uppermost region of the central upper dome surface, andwherein the vertical-axis turbine has a maximum vertical height parallel to the vertical axis, the maximum vertical height being substantially smaller than a maximum diameter of the outer periphery of the vertical-axis turbine. 2. The turbine of claim 1, wherein the maximum vertical height of the vertical-axis turbine is measured parallel to the vertical axis from a lower level at the outer periphery to a higher level at a peak of the central upper dome surface. 3. The turbine of claim 1, wherein the vertical-axis turbine includes a continuously solid upward facing surface having a generally circular border at the outer periphery of the vertical axis turbine. 4. The turbine of claim 3, wherein the continuously solid upward surface is free of openings. 5. The turbine of claim 4, wherein all of the upwardly protruding fins are positioned inwardly of the circular border and extend to a vertical height above the circular border. 6. The turbine of claim 1, wherein the maximum diameter of the outer periphery of the vertical-axis turbine is about 5 feet or greater. 7. The turbine of claim 1, wherein the central upper dome surface is symmetric about the vertical axis. 8. The turbine of claim 7, wherein the plurality of fins are non-symmetric about the vertical axis. 9. The turbine of claim 1, wherein all of the upwardly protruding fins have substantially the same shape and size. 10. The turbine of claim 1, wherein the concave face of each of the upwardly protruding fins terminates in a non-radial direction that extends toward an adjacent fin and away from the vertical axis. 11. The turbine of claim 1, wherein the plurality of upwardly protruding fins are arranged such that vertical-axis turbine that rotates in a first direction about the vertical axis both in response to fluid flowing over the turbine in a first flow direction that is generally perpendicular to the vertical axis and in response to fluid flowing over the turbine in a second opposite flow direction that is generally perpendicular to the vertical axis. 12. The turbine of claim 1, wherein, while each fin rotates to different positions about the vertical axis, each fin is configured to capture fluid flowing over the vertical-axis turbine, redirect the fluid along a path different from the ambient fluid flow, and contribute to the creation of a high pressure region on downstream portion of the vertical-axis turbine. 13. A turbine system for generating electrical power, comprising: a vertical-axis turbine that rotates about a vertical axis in response to fluid flowing toward the turbine in a flow direction that is generally perpendicular to the vertical axis, the vertical-axis turbine including: a central upper dome surface at least partially defined by an upwardly convex curve in a vertical cross-sectional plane, and a plurality of upwardly protruding fins that each extend from an outer region proximate to an outer periphery of the vertical-axis turbine toward the central upper dome surface, wherein each of the fins directly joins with a lower region of the central upper dome surface such that an uppermost region of the central upper dome surface has a greater vertical height than each of the fins, wherein each of the fins include a convex face and an oppositely disposed concave face that intersect at a curved upper ridge, wherein both the convex face and the concave face of each upwardly protruding fin are upwardly facing surfaces; andbase structure positioned below the vertical-axis turbine to remain generally stationary during rotation of the vertical-axis turbine, the base structure comprising a plurality of anchor legs extending away from the vertical-axis turbine for a length that is greater than a maximum vertical height of the vertical axis turbine. 14. The system of claim 13, further comprising an electrical generator positioned between the vertical-axis turbine and the base structure so as to generate electrical power in response to the rotation of the vertical-axis turbine relative to the base structure. 15. The system of claim 14, further comprising onshore electronics system electrically connectable to the electrical generator so as to condition the electrical power for output to an external power grid. 16. The system of claim 13, further comprising a pump mechanism positioned between the vertical-axis turbine and the base structure so as to force hydraulic fluid to an onshore generator systems in response to the rotation of the vertical-axis turbine relative to the base structure. 17. The system of claim 13, wherein the outer periphery of the vertical-axis turbine is defined by a diameter centered about vertical axis of about 5 feet or greater. 18. The system of claim 13, wherein the central upper dome surface is symmetric about the vertical axis. 19. The system of claim 18, wherein the plurality of fins are non-symmetric about the vertical axis. 20. The system of claim 19, wherein each of the plurality of fins have substantially the same shape and size.