It is also important that consumers of solar PV can get the best return on their investment which lowers the cost per Kwh. The lower the cost per Kwh, the more people will install solar panels, and the more people install solar panels, the more the costs come down for the industry. It is one big virtuous cycle.
Regarding the sustainability of solar panels, the current crystalline silicon modules are quite energy intensive to produce, but researchers are hard at work developing next-generation polymer and organic solar cells that would require much less energy to produce as well as be cheaper.
Something to look forward to