Chief Executive John Lee said on Tuesday that power company CLP must get to the bottom of a series of power outages in recent months, adding that he's highly concerned about the matter.

Lee said before the weekly Executive Council meeting that CLP needs to improve in a number of areas to ensure a stable and reliable power supply, which he stressed is important to the people and the territory's economic development.

"It is necessary for CLP to identify the root causes of the problems, make fundamental improvements to reduce the chance of similar incidents in the future," the CE told reporters.

"Some systems may have been running for a long time, so it is important that they're always well-maintained, then there'll be a good system to ensure that periodic checks take place."

The CE also said it is essential for the company to deploy more manpower to improve its response to emergencies.

He stressed that officials will follow up on CLP's plans to enhance its overall power supply system capabilities and reduce the risks brought by adverse weather.

The firm had said that a voltage dip in the early hours of Sunday may have been caused by the weather.