Organisers say this year's Urdd National Eisteddfod on Anglesey is the 'greenest' ever to be staged in its history.

This year's festival is expected to reduce carbon emissions by an estimated 40,000kg compared with last year's event on the outskirts of Port Talbot, according to an environmental forecast.

It's the equiavalent of saving the entire annual electricity consumption in the village of Pencarnisiog (i.e. 30 homes) or planting 1,800 trees and allowing them to grow for ten years.

Urdd Gobaith Cymru says it's committed to running its activities in the "most sustainable and environmentally friendly way possible".

Urdd arts director Llio Maddocks said: "Ynys Môn is often referred to as a green island, so today’s announcement is a fitting tribute to the area."

"As a youth organisation, it is our responsibility to ensure a sustainable future and to set a positive example for our children and young people."

"We are incredibly proud of these innovations and encourage everyone visiting the site to come and see the green hydrogen power units during the week. It is even possible to drink the clean, pure water produced by the generator – arguably making it the ‘newest’ water on the planet!"

"As organisers, we are committed to laying strong foundations for the festivals of the future and leading the way in sustainability in Wales."

For the first time in the Eisteddfod's history, 30% of the Maes is being powered using green hydrogen power units, which produce only clean, pure water as their output.

The system is provided by GeoPura through a partnership between the Urdd, Menter Môn and Ambition North Wales, the regional economic board.

Dafydd Gruffydd, Menter Môn's managing director, said: "The advantage of green hydrogen is that it allows us to decarbonise activities that are otherwise difficult to tackle."

"Large festivals have traditionally relied on diesel generators because there have been few viable alternatives. By using hydrogen power units, we can provide clean, quiet power and significantly reduce the carbon footprint of events."

The Anglesey Showground was also used when the Urdd Eisteddfod last came to Anglesey in 2004.

It was deemed a suitable venue for this year's event - with grid power and solar panels being used, along with the permanent infrastructure on site, to significantly reduce the environmental impact, compared with the use of traditional diesel generators.

S4C's live coverage of the Eisteddfod, produced by indie company Afanti, is also dependent on sustainable energy systems - with the TV studio using a battery system that enables staff to power electric vehicles and technical equipment on site.

In addition, all of the Urdd's arts and Eisteddfod staff have been given carbon literacy training.