Even though monitors still have a soft-off button (they are not disconnected from the mains), the energy consumption is lower than 0.1 Watts in most models. Their point of similarity: they all have an integrated power supply unit. If you are still using an old TFT device, it could use more energy. If the external powers supply unit heats up to a great extent when the display is off, then your LCD monitor is a power hog. Power consumption of 10 Watts in the standby mode is typical. Incidentally, the same applies for LCD TVs. But it is different case with tube-based displays. Such TV devices require thrice the power (30 Watts in the standby mode). Corresponding monitors require up to 10 Watts. Even plasma televisions are considered as big energy devourers. But this is true only when they are in operation; they are surprisingly frugal in the standby mode. For instance, a 40-inch device in operation consumes 300 Watts as against a mere 2 Watts when it is in standby mode.
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