Some actual and proposed projects for large scale solar utilization are reviewed. The solar energy received by the United Kingdom is compared with the actual energy used. The use of flat plate collectors for water heating is described, together with their construction. Focusing collectors are compared and contrasted with flat plate collectors. The siting of collectors for maximum collection is described, as are methods of connecting the collectors into existing domestic hot water circuits. Materials of construction, corrosion problems and space heating are described briefly. A method of estimating the financial saving which may be expected is given, with an example of how this may be put into perspective with other fuel costs and conventional energy saving methods.