The Pentland Firth is the strait that lies between the far north of mainland Scotland and the Orkney Islands.
It's a wild area with some of the fastest tides in the world, where the power of the sea is being harnessed by tidal turbines sitting on the sea bed.
But this type of green energy is still very expensive to generate - so what is the future of tidal and wave power?
We explore some of the ground breaking projects being developed in the region and speak to companies who are trying to reduce costs to make the energy more viable.
Produced and presented by Theo Leggett
(Image: A MeyGen turbine being installed on the sea bed. Credit: MeyGen)
Turkey: Fixing a broken economy
AI: Looking to the future
Investing in Africa: Who benefits?
Investing in Africa: US and AGOA
Investing in Africa: Media
Investing in Africa: Russia and the CAR
Investing in Africa: What needs to change?
Uorfi Javed: India's most controversial influencer
Do you like a noisy or quiet workplace?
Why big projects go wrong
La Palma: Rebuilding after a volcano
Deep sea mining
Paris Air Show: The future of aviation
Business Daily meets: Iñaki Ereño
Tackling India's heatwaves
Portugal’s digital nomads
The rising popularity of surrogacy in Georgia
Tourism: Emily in Paris
Tourism: Speciality cruises
Tourism: The economics of the all inclusive
Create your
podcast in
minutes
It is Free
The Commercial Edge: Unleash the Power of People
The emPOWERed Half Hour
World Business Report
Global News Podcast
Friday Night Comedy from BBC Radio 4
The Infinite Monkey Cage
You’re Dead to Me