Concentrating solar power with glasshouses

H: dcril terwoven\NRPorbl\DCC\DER\0406082_ I docx-28/06/2016 A solar collection system, comprising: an enclosure having a transmissive surface positioned to transmit solar radiation; a receiver positioned within the enclosure, the receiver including a first and second elongated conduit carrying a working fluid; and a first reflector and a second reflector positioned proximate to the first and second elongated conduits, respectively, and being rotatable relative to the enclosure, the first reflector and the second reflector each including: a bilaterally symmetric primary portion; and a secondary portion fixed relative to the primary portion and comprising at a unilateral extension of the primary portion, the unilateral extension having a first operational mode in which it is positioned to continue a 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, 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 reflectors are rotatable about their respective common focal lines to concentrate thereon a fraction of solar radiation from the sun in the first operational mode, and wherein the first reflector shades the second reflector in at least some rotational positions. -O -e A~ to~