Since the launch of the Open Electricity Market (OEM) in 2018, over 60% of Singapore residential ... The tariff is revised every quarter and consists of two parts: 1) fuel cost and 2) non-fuel cost.

This is called as the Original Equipment Manufacturer or OEM key. It comes programmed into your PCs. This embedded product key is stored in the NVRAM of the BIOS/EFI on the motherboard.