On Sunday, the Financial Times reported that Britain’s National Grid has begun to remove components and devices it received from a unit of China-backed Nari Technology from its electricity transmission network over fears of a potential vulnerability to a cyber attack which could have taken out the nation’s power grid.

The newspaper reported that according to a Whitehall official, the decision was made in April after consultations between the utility and the National Cybersecurity Centre, a division of the nation’s signal intelligence agency GCHQ.

The FT went on to quote an official at NR Electric UK, a subsidiary of Nari, who revealed the company was no longer able to gain access to facilities where the components were installed. The employee said that there was no reason given by National Grid for why the contracts were terminated.

The report cited another unnamed source which said the decision was made in an effort to help the utility better control and balance the grid and minimize the risk of blackouts.

The report noted that it was not entirely clear whether the components were removed from the electricity transmission network or not.

There were no immediate comments from NR Electric UK, National Grid, GCHQ, Britain’s energy security department and the Chinese Embassy in London in response to media inquiries regarding the matter.