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A protective transparent enclosure (such as a glasshouse or a greenhouse) encloses a concentrated solar power system. The concentrated solar power system includes one or more solar concentrators and one or more solar receivers. Thermal power is provided to an industrial process, electrical power is

A protective transparent enclosure (such as a glasshouse or a greenhouse) encloses a concentrated solar power system. The concentrated solar power system includes one or more solar concentrators and one or more solar receivers. Thermal power is provided to an industrial process, electrical power is provided to an electrical distribution grid, or both. In some embodiments, the solar concentrators are parabolic trough concentrators with one or more lateral extensions. In some embodiments, the lateral extension is a unilateral extension of the primary parabolic trough shape. In some embodiments, the lateral extensions are movably connected to the primary portion. In some embodiments, the lateral extensions have a focal line separate from the focal line of the base portion. In some embodiments, the greenhouse is a Dutch Venlo style greenhouse.

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1. A system comprising: an at least partially enclosing structure establishing an interior region, at least a section of the enclosing structure enabling transmittance of solar radiation from the sun;within the interior region, a line-focus concentrator coupled to suspension members to selectively r

1. A system comprising: an at least partially enclosing structure establishing an interior region, at least a section of the enclosing structure enabling transmittance of solar radiation from the sun;within the interior region, a line-focus concentrator coupled to suspension members to selectively rotate about a focal line to concentrate the solar radiation at the focal line, wherein all the suspension members comprise flexible wires, wherein the line-focus concentrator comprises a longitudinal, bilaterally symmetric primary portion and a secondary portion comprising a unilateral extension coupled to the primary portion; anda counterweight attached to the line-focus concentrator to, at least in some rotational positions of the line-focus concentrator, counterbalance a weight of the line-focus concentrator. 2. The system of claim 1, wherein the primary portion comprises at least one reflective surface that in cross section at least approximates a segment of a parabolic curve. 3. The system of claim 1, wherein the primary portion comprises a continuous reflective surface that in cross section is a segment of a parabolic curve. 4. The system of claim 1, wherein the primary portion comprises a plurality of reflective surfaces corresponding in cross section to respective segments of a parabolic curve. 5. The system of claim 1, wherein the primary portion comprises a plurality of reflective facets. 6. The system of claim 1, wherein the unilateral extension of the secondary portion is articulated to the primary portion. 7. The system of claim 1, wherein the unilateral extension of the secondary portion is enabled to be moved into a position selected from at least one operational position and at least one stowed position. 8. The system of claim 7, wherein the at least one stowed position comprises a partially retracted position. 9. A system comprising: an at least partially enclosing structure establishing an interior region, wherein the enclosing structure has a structural member and a section that enables transmittance of solar radiation from the sun;within the interior region, a line-focus concentrator coupled to a drive mechanism to selectively rotate about a focal line to concentrate a fraction of the solar radiation at the focal line, wherein the line-focus concentrator comprises a longitudinal, bilaterally symmetric primary portion and a secondary portion comprising a unilateral extension coupled to the primary portion, wherein the structural member is above the line-focus concentrator, and wherein the structural member carries the drive mechanism; anda counterweight attached to the line-focus concentrator to, at least in some rotational positions of the line-focus concentrator, counterbalance a weight of the line-focus concentrator. 10. The system of claim 9, wherein the line-focus concentrator is an asymmetric line-focus concentrator. 11. The system of claim 10, wherein the asymmetric line-focus concentrator is enabled to be selectively rotated at least in accordance with seasonal changes in declination of the sun. 12. The system of claim 10, wherein the unilateral extension of the secondary portion is enabled to be moved into a position selected from at least one operational position and at least one stowed position. 13. The system of claim 12, wherein the at least one stowed position comprises a partially retracted position. 14. The system of claim 12, wherein during at least a first interval of the year the secondary portion is enabled to be placed in the at least one operational position and during at least a second interval of the year the secondary portion is enabled to be placed in the at least one stowed position. 15. The system of claim 12, wherein the primary portion in cross section at least approximates a particular curvature and in the at least one operational position the unilateral extension of the secondary portion is enabled to act as a continuation of the particular curvature of the primary portion and shares the same focal line as the primary portion. 16. The system of claim 12, wherein the primary portion is a first line-focus concentrator, the focal line is a first focal line, and in the at least one operational position the secondary portion is enabled to act as a second line-focus concentrator having a second focal line. 17. The system of claim 16, further comprising: within the interior region, a line-focus receiver enabled to operate coincident to the first focal line and a reflector enabled to operate coincident to the second focal line; andwherein the reflector is enabled to redirect at least a portion of the solar radiation received from the second line-focus concentrator to the line-focus receiver. 18. The system of claim 16, further comprising: within the interior region, a line-focus receiver enabled to operate coincident to the first focal line and a reflector enabled to operate coincident to the second focal line; andwherein the second line-focus concentrator and the reflector are collectively enabled to focus at least a portion of the solar radiation received from the second line-focus concentrator onto the line-focus receiver. 19. The system of claim 9, wherein a rotation is in accordance with a predefined solar tracking strategy. 20. The system of claim 19, wherein the predefined solar tracking strategy comprises control of rotational positioning at least in part via closed-loop feedback. 21. The system of claim 20, wherein the closed-loop feedback uses at least one implementation technology selected from: mechanical, electromechanical, analog circuitry, sampled data, digital logic, stored-program digital-processor, continuous-time, or discrete-time. 22. The system of claim 20, wherein the predefined solar tracking strategy comprises enabling rotating the line-focus concentrator as determined by the closed-loop feedback to at least reduce an angle of incidence of rays of the sun with respect to a vector normal of the line-focus concentrator. 23. The system of claim 19, wherein the predefined solar tracking strategy comprises control of rotational positioning at least in part via a timer. 24. The system of claim 23, wherein the timer uses at least one implementation technology selected from: mechanical, electromechanical, analog circuitry, sampled data, digital logic, stored-program digital-processor, continuous-time, or discrete-time. 25. The system of claim 19, wherein the predefined solar tracking strategy comprises enabling rotating the line-focus concentrator at least at predetermined intervals to reduce an angle of incidence of rays of the sun with respect to a vector normal of the line-focus concentrator. 26. The system of claim 19, wherein the predefined solar tracking strategy comprises enabling at least occasionally rotating the line-focus concentrator to reduce an angle of incidence of rays of the sun with respect to a vector normal of the line-focus concentrator. 27. The system of claim 9, wherein the primary portion comprises at least one reflective surface that in cross section at least approximates a segment of a parabolic curve. 28. The system of claim 9, wherein the primary portion comprises a continuous reflective surface that in cross section is a segment of a parabolic curve. 29. The system of claim 9, wherein the primary portion comprises a plurality of reflective surfaces corresponding in cross section to respective segments of a parabolic curve. 30. The system of claim 9, wherein the primary portion comprises a plurality of reflective facets. 31. The system of claim 9, wherein the unilateral extension comprises at least one reflective surface and the unilateral extension in cross section at least approximates a segment of a parabolic curve. 32. The system of claim 9, wherein the unilateral extension of the secondary portion is enabled to rotate about a respective longitudinal axis that is parallel to the focal line. 33. The system of claim 9, further comprising a hinge enabling the unilateral extension of the secondary portion to rotate about a longitudinal axis that is parallel to the focal line. 34. The system of claim 9, wherein the unilateral extension of the secondary portion is articulated to the primary portion. 35. The system of claim 34, wherein an articulation is enabled by at least one movable joint. 36. The system of claim 9, further comprising: within the interior region, a line-focus receiver enabled to operate coincident to the focal line and stationary with respect to the structure. 37. The system of claim 9, wherein the rotation about the focal line of at least the primary portion is at a radial distance specified by a focal length. 38. The system of claim 37, wherein the focal length is a nominal focal length and the radial distance has an associated variance from the nominal focal length in view of one or more manufacturing, installation, maintenance, and operational tolerances. 39. A line-focus concentrator comprising: a longitudinal bilaterally symmetric primary portion at least approximating a parabolic curvature; anda secondary portion comprising a unilateral extension movably coupled to the primary portion, the unilateral extension having a first operational mode in which it is positioned to continue the curvature of the primary portion and share with the primary portion a common longitudinal focal line, the unilateral extension having a second operational mode in which it is in a stowed position, wherein in the stowed position the unilateral extension does not continue the curvature of the primary portion,wherein the line-focus concentrator is enabled to selectively rotate to an operational angle about the common focal line to concentrate thereon solar radiation from the sun, andwherein in the first operational mode both the primary portion and the secondary portion reflect the solar radiation to the longitudinal focal line for all operational angles of the line-focus concentrator. 40. The line-focus concentrator of claim 39, wherein the rotation about the focal line of at least the longitudinal bilaterally symmetric portion is at a radial distance specified by a focal length. 41. The line-focus concentrator of claim 40, wherein the focal length is a nominal focal length and the radial distance has an associated variance from the nominal focal length in view of one or more manufacturing, installation, maintenance, and operational tolerances. 42. The line-focus concentrator of claim 39, wherein the primary portion comprises at least one reflective surface that in cross section at least approximates a segment of a parabolic curve. 43. The line-focus concentrator of claim 39, wherein the primary portion comprises a continuous reflective surface that in cross section is a segment of a parabolic curve. 44. The line-focus concentrator of claim 39, wherein the primary portion comprises a plurality of reflective surfaces corresponding in cross section to respective segments of a parabolic curve. 45. The line-focus concentrator of claim 39, wherein the primary portion comprises a plurality of reflective facets. 46. The line-focus concentrator of claim 39, wherein the unilateral extension comprises at least one reflective surface and the unilateral extension in cross section at least approximates a segment of a parabolic curve. 47. A system comprising: a first line-focus concentrator and a second line-focus concentrator, each line-focus concentrator having: a longitudinal, bilaterally symmetric primary portion at least approximating a parabolic curvature; anda secondary portion comprising a unilateral extension movably coupled to the primary portion with a hinge, the unilateral extension having a first operational mode in which it is positioned to continue the curvature of the primary portion and share with the primary portion a common focal line, the unilateral extension having a second operational mode in which it is in a stowed position, wherein in the stowed position the unilateral extension is rotated around the hinge, and wherein in the stowed position the unilateral extension and the primary portion do not share the common focal line,wherein the first and second line-focus concentrators are rotatable about their respective common focal lines to concentrate thereon a fraction of solar radiation from the sun in the first operational mode, andwherein the first line-focus concentrator shades the second line-focus concentrator in at least some rotational positions. 48. The system of claim 47, wherein the primary portions of the first and second line-focus concentrators each comprises at least one reflective surface that in cross section at least approximates a segment of a parabolic curve. 49. The system of claim 47, wherein the primary portions of the first and second line-focus concentrators each comprises a continuous reflective surface that in cross section is a segment of a parabolic curve. 50. The system of claim 47, wherein the primary portions of the first and second line-focus concentrators each comprises a plurality of reflective surfaces corresponding in cross section to respective segments of a parabolic curve. 51. The system of claim 47, wherein the primary portions of the first and second line-focus concentrators each comprises a plurality of reflective facets. 52. The system of claim 47, wherein each of the unilateral extensions of the first and second line-focus concentrators is articulated to its respective primary portion. 53. The system of claim 47, wherein each of the unilateral extensions of the first and second line-focus concentrators is enabled to be moved into a position selected from at least one operational position and at least one stowed position.