A conference powered by 
Green IO London 2025
Where IT leaders tackle their own Sustainability challenges
Green IO is where technology leaders tackle their own sustainability challenges. Our 2025 theme for London 2025 is Good for the Planet, Good for Business? Through practical use cases and expert talks,...
September 23 to 24, 2025
etc. venues 155 Bishopsgate, London EC2M 3YD
Call for speakers is now open!
All expertise is welcomed: green software engineering, low-carbon cloud and data center operations, responsible AI, sustainable design, low-carbon network and infrastructure, awareness and organizational challenge, Green IT landscape, etc.
Meet the speakers
... and more to come!
Agenda
The complete agenda is now live! You can view it below.
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Day 1 (Workshop Day)
Tuesday 23rd September 2025
14:00 to 14:25WorkshopSee moreData-driven decisions that maximise Cloud and AI sustainability. A GreenOps deep dive by engineers, for engineers and CTO's
See what is behind the technology that enables customers like Mastercard cut 800Mt of C02 and reduce costs by $28m. Focus on coverage for AI - proactive data-driven actions to deal with the tsunami of cost and GHG emissions. Plus, best practice use of ISO 14064 GHG data in the platforms that engineers, FinOps practitioners and IT Sustainability teams use.In collaboration with
14:25 to 14:50WorkshopResilio's workshop: Title TBA
In collaboration with
14:50 to 15:15WorkshopAguaro's workshop: Title TBA
In collaboration with
15:15 to 15:40WorkshopSee moreDWP Digital's digital sustainability 90 day roadmap
In collaboration with
15:40 to 16:05Coffee Break & Networking
16:05 to 16:3016:30 to 16:55WorkshopWorkshop TBA
16:55 to 17:20WorkshopWorkshop TBA
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Day 2 (Conference Day)
Wednesday 24th September 2025
09:30 to 09:5509:55 to 10:20KeynoteSee moreForget SkyNet, will the energy consumption of AI destroy humanity? What can developers learn from Sarah Connor?
10:20 to 10:4510:45 to 11:15Coffee Break & Networking
12:05 to 12:30TalkSee moreMastercard are saving $28m Cloud spend and 800 MTCo2. Now it is time for UK-driven success.
How to Unlock the Double-Wins of Cloud Sustainability. Using real-life case-studies, this session explores how enterprise cloud users can deliver cloud optimisation initiatives which deliver business value, driven by GreenOps data. This session will share UK and global use cases driven from the UK, including NTT Data and Cambridge University Press. This includes Sustainable AI, a rapidly growing pressure on cost and emissions targets.12:30 to 12:55Panel DiscussionSee moreCan networks and DC keep up with the AI boom? A 2030 discussion
12:55 to 14:00Lunch Break & Networking
14:00 to 14:2514:50 to 15:15TalkSee moreClimate change is here - using a systems thinking approach to keep NHS resilient
15:15 to 15:40Panel DiscussionSee moreScaling sustainable AI in large organization: the case of public services
15:40 to 16:05Coffee Break & Networking
16:55 to 17:2017:20 to 17:30Closing remarks
17:30 to 20:00Green IO Happy Hours
Meet our partners
Members of the London Green IT ecosystem as well as our corporate partners will be available to exchange with you on how to accelerate your digital sustainability journey.
Global Premium
Global Champion
CHAMPION
Global Non Profit
Non Profit
Why they attended our past London editions
“Great set of speakers with a shared passion to have a conscious awareness of a sustainable use of tech to have a real positive impact on people and planet”
Rob Price, Founder (Accelleo)"Apidays London was a great conference, specifically the Green IO sustainability conference. Not something I have seen before but thought provoking and inspirational.”
Michala, Chief of Staff for SRE (Goldman Sachs)Thank you Gaël DUEZ for hosting a fantastic conference. I loved participating and as a speaker I was grateful for the warm welcome from the audience. Additionally, I was able to make hugely valuable connections, which will no doubt be helpful to to meet our ambitious Carbon Zero targets at Cambridge University Press & Assessment. Can't wait for next year!!
Julie Dennis, CTO (Cambridge University Press & Assessment)Gaël Duez
Green IO Founder
About Apidays
Apidays is the world's leading series of API conference. In today’s intricate digital landscape, APIs have emerged as powerful conduits for innovation, bridging the gaps and unlocking new realms of possibility.
