Building-integrated photovoltaics (BIPV) is integrating of photovoltaic modules into the building envelope such as roofs or windows.These solid-state devices are used to replace conventional building materials to generate electricity out of sunlight with no maintenance and help in fighting global warming as the produce no pollution.BIPV products are most useful in construction of new buildings as an ancillary source of electrical power, although existing you can retrofit old buildings with BIPV proudcts as well. The advantage of BIPV over normal standard PV panels is that they integrate into the buildings instead of sticking out leading some people to call it ugly.ALso they help in saving the amount of money spent on building materials and labor that would normally be used to construct the part of the building . These advantages make BIPV one of the fastest growing segments of the photovoltaic industry with some people estimating that the use of BIPV will increase at more than 50% annually over the next few years with more than 1 GW of BIPV modules installed in the last year.