How much energy is required to store wind and solar power on the grid?

Renewable energy holds the promise of reducing carbon dioxide emissions. But there are times when solar and wind farms generate more electricity than is needed by consumers. Storing that surplus energy in batteries for later use seems like an obvious solution, but a new study from Stanford University suggests that might not always be the case.

Anonymous says power grid is not a target

Cyber activists linked to Anonymous have rebuffed allegations that the collective could potentially threaten the power grid by staging a coordinated cyber attack.

NSA: Anonymous could target power grid

The director of the National Security Agency (NSA) has expressed concern that hackers aligned with Anonymous could cause a "limited power outage" via a coordinated cyber attack.

'Digital ants' check networks for viruses

Wake Forest University professor Errin Fulp is training an army of 'digital ants' designed to patrol the power grid and protect it from viruses.

Space weather risk to airlines

Air crew and frequent fliers could run health risks from space weather, according to a report from insurers Lloyds.