STCs are a form of government incentive to promote the installation of Solar power systems and reduce greenhouse gas emissions. The value of STCs can fluctuate based on market demand and government policies. It is important for individuals or businesses looking to install a Solar power system to understand the STC scheme and how it can help offset the cost of their investment. STCs can be traded on the open market or through brokers, making it easier for system owners to benefit from the financial incentives available.