
Bifacial cells are two-sided, light-sensitive solar cells which can be installed vertically in a north-south direction. Thanks to a module that has the same level of efficiency on both sides, the energy yields for the east and west sides can simply be added together. Thus, a bifacial module can reach an annual yield of almost 100 % of the yield that a standard module with the best possible south orientation delivers.

In 1997 TNC constructed the first and currently only bifacial pilot system in the world. The measurement results from this system show that the expected output capacities were also attainable in practice.
According to TNCs calculations from the European evaluation of the potential use of PV noise barriers, using bifacial technology in Western Europe results in a potential of about 1200 MW.