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)
Business Daily meets: The founders of Seatfrog
The price for Mexican heritage
Rebuilding Turkey after the earthquake
Is it possible to grow food on the Moon?
Working at altitude
Is France leading the way on nuclear?
European Para Championships: A new sporting event
Business daily meets: Janelle Jones
The chocolate village
The new Panama Canal?
Is Georgia benefitting from Russian money?
Women's football: Life after retirement
Women’s football boots: A bad fit?
Women's football in South America
Australia and New Zealand: The perfect sporting hosts?
Is women’s football a good investment?
Business Daily Meets: Gary Neville
Spanish election: How will young people vote?
The celebrities investing in alcohol brands
Turkey: Fixing a broken economy
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