Leo, in Newport, south Wales, a 23-metre-high datacentre stands beside an enclave of 27 houses.

An enclave is a small area or group that is separate from the area around it. Here, it means the group of houses beside the datacentre.

Johnston says the building has blocked much of his view.

Here, “blocked” means the building is in the way, so he cannot see as much as before.

The report calls it a hyperscale datacentre.

A hyperscale datacentre is a very large building or site that holds computers for storing and handling digital information.

A hyperscale datacentre is a very large facility for storing and processing digital information.

Here, it means a very large site with computers that store and handle digital information.

A hyperscale datacentre is a very large facility for storing and processing digital information.

Here, “processing” means using computers to work with information, such as changing it or carrying out tasks with it.

Johnston is concerned that the air-blast coolers—equipment that blows air to cool the facility—could create a constant drone.

These are machines that blow air to lower the temperature of the facility.

Johnston is concerned that the air-blast coolers—equipment that blows air to cool the facility—could create a constant drone.

A drone is a low, steady sound that continues for a long time. Here, it could come from the cooling equipment.

He also worries that testing the backup diesel generators could produce harmful fumes.

These are machines that use diesel fuel to make electricity if the main power supply is not available.

He also worries that testing the backup diesel generators could produce harmful fumes.

Fumes are gases or smoke that can be breathed in. Here, they may come from testing the generators.

He says he keeps his bathroom window closed because of a low hum from another facility on the same campus.

A low hum is a quiet, deep, steady sound. Here, it comes from another facility.

The Guardian reports that one of the three Vantage datacentres on the campus is operational.

Operational means working and being used. Here, one datacentre is already running.

It describes some residents’ earlier anger and frustration as giving way to weariness and resignation.

“Giving way to” means being replaced by something else. Here, the residents’ anger and frustration were replaced by tiredness and acceptance.

It describes some residents’ earlier anger and frustration as giving way to weariness and resignation.

Weariness is a feeling of being very tired, and resignation is accepting something unpleasant that you cannot change. Here, some residents seem to have stopped expecting the situation to improve.