Abstract: Anti-theft apparatus for protecting solar electricity generating panels from theft including at least a first lockable element configured for engagement with a first solar electricity generating panel, at least a second lockable element configured for engagement with a second solar electricity generating panel, at least one locking element for securing the at least first and the at least second lockable elements together in a locking arrangement whereby the first and second solar electricity generating panels are at least locked together, and a top securing element arranged for non-removable engagement with the locking element, the top securing element being operative to resist disengagement of the first and the second solar electricity generating panels from the locking element.