To measure the scale of data centres' growing electricity demand, it is useful to data centres on power systems. In 2025, their peak capacity was equivalent to 5% of the nation's peak demand. In 2030, their share will grow to more than 10% of projected peak demand. This is mainly due to hosting larger and more In Korea, Japan and China, data centres' peak capacity was only comparable to a little over 1% of each countries' peak demand in 2025. In 2030, however, this is expected to show a major increase to around 4% of peak demand in 2030.