Good News: Chemotherapy drugs by drone and the unlikely return of a rockstar’s guitar after 45 years

Another instalment of the Good News round-up is here to cheer up the weekend. Here are five stories that will give you hope.

Watch the video above for more on each story, or read on below…

It took 14 years to complete, but Switzerland has finally activated a vast ‘water battery’ that has the same capacity for storing electricity as 400,000 electric car batteries – roughly 20 million kilowatt-hours.

The green battery will become one of Europe's main renewable sources of energy, playing an important role in stabilising power supplies in Switzerland and Europe. It stores any excess electricity from renewable sources.

The system uses two large reservoirs of water located at different altitudes.

"It stores any excess electricity from renewable sources by pumping water"

When the water pumps from the lower lake to the upper lake, the battery is "charged". And when the direction of the pump is reversed, the flow of water rotates a turbine, which generates hydroelectric power.

The battery can generate vast quantities of hydroelectric energy, enough to power around 900,000 homes.

Britain’s National Health Service will start using drones to fly chemotherapy drugs to cancer patients on the Isle of Wight, cutting delivery times from four hours to 30 minutes.

Drones will transport doses from Portsmouth, on the mainland, to a hospital on the island.

The drones will be able to carry up to 20kg of doses, and each delivery will replace two car journeys and one hovercraft or ferry journey per delivery – reducing carbon emissions as well as speeding up the process.

Some chemotherapy drugs have a short shelf life, so the new delivery method will offer a better option for cancer patients living on the island, many of whom have previously had to travel