The standard voltage in the Netherlands and most other European countries is 230 volts. Although it was common in the past to refer to 220 volts, the voltage has gradually increased to 230 volts. This is the voltage currently used for household electricity in the Netherlands. However, it is important to note that some older devices may still be labeled for 220 volts, but they can still be safely used with the current voltage of 230 volts.