{"id":606,"date":"2024-04-05T10:00:00","date_gmt":"2024-04-05T10:00:00","guid":{"rendered":"https:\/\/jacar.es\/datacenter-sostenible-2024\/"},"modified":"2024-04-05T10:00:00","modified_gmt":"2024-04-05T10:00:00","slug":"datacenter-sostenible-2024","status":"publish","type":"post","link":"https:\/\/jacar.es\/en\/datacenter-sostenible-2024\/","title":{"rendered":"Sustainable Data Centers: What Changes in 2024"},"content":{"rendered":"<p>Data centers consume ~1-2% of global electricity and grow every month. Regulatory, customer, and cost pressure pushes toward real sustainability \u2014 not just green marketing. <strong>2024<\/strong> marks a point where truly effective practices separate from greenwashing: more honest metrics, liquid cooling going mainstream, CO\u2082-based workload scheduling, and waste-heat reuse. This article covers what works in production today and what remains vaporware.<\/p>\n<h2 id=\"beyond-pue-honest-metrics\">Beyond PUE: Honest Metrics<\/h2>\n<p><strong>PUE<\/strong> (Power Usage Effectiveness) = total energy \/ IT energy. A PUE of 1.5 means 50% overhead. Better near 1.1.<\/p>\n<p>Problem: PUE measures only electrical efficiency, not total impact. Complementary metrics:<\/p>\n<ul>\n<li><strong>WUE<\/strong> (Water Usage Effectiveness): litres water \/ kWh IT. Critical in water-stressed zones.<\/li>\n<li><strong>CUE<\/strong> (Carbon Usage Effectiveness): kg CO\u2082e \/ kWh IT. Reflects real energy mix.<\/li>\n<li><strong>ERE<\/strong> (Energy Reuse Effectiveness): how much waste heat is leveraged.<\/li>\n<li><strong>REF<\/strong> (Renewable Energy Factor): % direct renewable (not purchased credits).<\/li>\n<\/ul>\n<p>Serious companies report all 5, not just PUE. EU already mandates joint reporting via <strong><a href=\"https:\/\/energy.ec.europa.eu\/topics\/energy-efficiency_en\">EU Energy Efficiency Directive<\/a><\/strong> (revised 2023).<\/p>\n<h2 id=\"liquid-cooling-from-niche-to-mainstream\">Liquid Cooling: From Niche to Mainstream<\/h2>\n<p>Density increases (GPUs for AI, ever-denser CPUs) make air cooling inadequate for new racks. Three modalities:<\/p>\n<h3 id=\"direct-to-chip-liquid-cooling\">Direct-to-chip liquid cooling<\/h3>\n<p>Tubes with refrigerant reach CPU\/GPU directly. Captures 70-80% of IT heat.<\/p>\n<ul>\n<li><strong>Application<\/strong>: GPU racks (H100, H200, MI300) for AI.<\/li>\n<li><strong>Potential PUE<\/strong>: 1.05-1.1.<\/li>\n<li><strong>Challenge<\/strong>: catastrophic leaks if poorly designed.<\/li>\n<\/ul>\n<h3 id=\"immersion-cooling\">Immersion cooling<\/h3>\n<p>Servers submerged in dielectric fluid.<\/p>\n<ul>\n<li><strong>Single-phase<\/strong>: fluid circulates via pump.<\/li>\n<li><strong>Two-phase<\/strong>: fluid boils at low temperature, condenses in heat exchanger.<\/li>\n<li><strong>PUE<\/strong>: 1.02-1.05.<\/li>\n<li><strong>Challenge<\/strong>: hardware needs certification, different maintenance.<\/li>\n<\/ul>\n<h3 id=\"rear-door-heat-exchangers\">Rear-door heat exchangers<\/h3>\n<p>Liquid-to-air exchangers on rack\u2019s rear door.<\/p>\n<ul>\n<li><strong>Retrofit-friendly<\/strong>: fits existing DC without total redesign.<\/li>\n<li><strong>PUE<\/strong>: 1.2-1.3 (not the ceiling but improves vs pure air).<\/li>\n<\/ul>\n<p>Hyperscalers (AWS, Azure, GCP) are doing most of their growth on direct-to-chip + immersion.<\/p>\n<h2 id=\"carbon-aware-workload-scheduling\">Carbon-Aware Workload Scheduling<\/h2>\n<p>Grid carbon intensity varies by hour and region. Flexible workloads can run when\/where cleanest:<\/p>\n<h3 id=\"by-time\">By time<\/h3>\n<ul>\n<li>Run batch jobs at night when wind is typically higher.<\/li>\n<li>ML training when excess solar in spring\/summer.<\/li>\n<li>Avoid fossil peaks (typically 6-10 PM).<\/li>\n<\/ul>\n<h3 id=\"by-region\">By region<\/h3>\n<ul>\n<li>If you have DCs in Sweden (hydro) and Ireland (gas), prioritise Sweden for deferrable workloads.<\/li>\n<li>Google and Microsoft publish <strong>carbon dashboards<\/strong> per region.<\/li>\n<\/ul>\n<p>Tools:<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/github.com\/Green-Software-Foundation\/carbon-aware-sdk\">Carbon Aware SDK<\/a><\/strong> (Green Software Foundation).<\/li>\n<li><strong><a href=\"https:\/\/www.electricitymaps.com\/\">Electricity Maps API<\/a><\/strong>: real-time carbon-intensity data.<\/li>\n<li><strong><a href=\"https:\/\/www.watttime.org\/\">WattTime<\/a><\/strong>: similar US data.<\/li>\n<\/ul>\n<p>Real cases:<\/p>\n<ul>\n<li><strong>Google<\/strong>: 24\/7 carbon-free energy goal for 2030.<\/li>\n<li><strong>Microsoft<\/strong>: carbon-aware batch scheduling in Azure Batch.<\/li>\n<\/ul>\n<h2 id=\"waste-heat-reuse\">Waste-Heat Reuse<\/h2>\n<p>A DC generates tens of MW of heat. Dumping to air is waste. Alternatives:<\/p>\n<h3 id=\"district-heating\">District heating<\/h3>\n<ul>\n<li><strong>Stockholm<\/strong>: Microsoft and Facebook DCs heat homes via district network.<\/li>\n<li><strong>Helsinki<\/strong>: target 40% heating from DCs by 2030.<\/li>\n<li><strong>Copenhagen<\/strong>: similar model.<\/li>\n<li><strong>Spain<\/strong>: nascent projects.<\/li>\n<\/ul>\n<p>Requires DCs near heat networks, sufficient return temperature (~60-80\u00b0C).<\/p>\n<h3 id=\"agriculture-aquaculture\">Agriculture \/ aquaculture<\/h3>\n<ul>\n<li><strong>Greenhouses<\/strong> beside DC for year-round production.<\/li>\n<li><strong>Fish farming<\/strong> with warm water.<\/li>\n<li><strong>Algae<\/strong> for biofuels.<\/li>\n<\/ul>\n<h3 id=\"industrial-process\">Industrial process<\/h3>\n<ul>\n<li><strong>Drying<\/strong> industrial products.<\/li>\n<li><strong>Pre-heating<\/strong> chemical processes.<\/li>\n<\/ul>\n<h2 id=\"water-usage-the-ignored-topic\">Water Usage: The Ignored Topic<\/h2>\n<p>Evaporative cooling consumes <strong>a lot<\/strong> of water \u2014 data:<\/p>\n<ul>\n<li>A mid-size DC can use 1-5 million litres\/day.<\/li>\n<li>In drought zones (Spain, California, Arizona), this is conflictive.<\/li>\n<\/ul>\n<p>Alternatives:<\/p>\n<ul>\n<li><strong>Dry cooling<\/strong>: less water, worse PUE.<\/li>\n<li><strong>Adiabatic cooling with grey\/recycled water<\/strong>.<\/li>\n<li><strong>Chillers<\/strong> instead of evaporation.<\/li>\n<\/ul>\n<p>Companies standing out: <strong><a href=\"https:\/\/www.equinix.com\/\">Equinix<\/a><\/strong> publishes detailed WUE. <strong><a href=\"https:\/\/www.digitalrealty.com\/\">Digital Realty<\/a><\/strong> too. Hyperscalers are more opaque.<\/p>\n<h2 id=\"renewable-energy-mix\">Renewable Energy Mix<\/h2>\n<p>Common greenwashing:<\/p>\n<ul>\n<li><strong>\u201c100% renewable\u201d<\/strong> via market-purchased certificates, while DC consumes local fossil mix.<\/li>\n<li><strong>Annual PPAs<\/strong> that balance, but not hour-by-hour.<\/li>\n<\/ul>\n<p>Honest metric: <strong>24\/7 carbon-free energy matching<\/strong>. Google leads in transparent reporting.<\/p>\n<p>Real projects:<\/p>\n<ul>\n<li><strong>PPAs with dedicated plants<\/strong>: AWS with specific solar plants.<\/li>\n<li><strong>On-site generation<\/strong>: solar panels on DC campus.<\/li>\n<li><strong>Batteries<\/strong>: storage to use high-hour renewable.<\/li>\n<li><strong>Electricity Maps<\/strong> and similar for real-time intensity.<\/li>\n<\/ul>\n<h2 id=\"european-regulation\">European Regulation<\/h2>\n<p>2024 brings regulatory changes:<\/p>\n<ul>\n<li><strong>Energy Efficiency Directive<\/strong>: mandatory consumption reporting, PUE\/WUE\/CUE.<\/li>\n<li><strong>Corporate Sustainability Reporting Directive (CSRD)<\/strong>: DCs as part of supply chain.<\/li>\n<li><strong>Climate Neutral Data Centre Pact<\/strong>: voluntary commitment (but widely EU-adopted).<\/li>\n<li><strong>EU Green Taxonomy<\/strong>: specific criteria for \u201csustainable\u201d DCs.<\/li>\n<\/ul>\n<p>Companies with EU DCs must prepare.<\/p>\n<h2 id=\"real-cases-with-numbers\">Real Cases with Numbers<\/h2>\n<ul>\n<li><strong><a href=\"https:\/\/datacenters.google\/locations\/hamina\/\">Google Hamina<\/a><\/strong>: seawater cooling, PUE ~1.1.<\/li>\n<li><strong><a href=\"https:\/\/news.microsoft.com\/source\/features\/sustainability\/\">Microsoft Quincy<\/a><\/strong>: liquid cooling in new racks.<\/li>\n<li><strong><a href=\"https:\/\/www.equinix.com\/\">Equinix MD11<\/a><\/strong>: PUE 1.09 with free cooling.<\/li>\n<li><strong><a href=\"https:\/\/www.arkdatacentres.co.uk\/\">Ark Data Centres<\/a><\/strong> (UK): PUE &lt;1.1 and heat reuse.<\/li>\n<\/ul>\n<h2 id=\"green-software-the-other-side\">Green Software: The Other Side<\/h2>\n<p>Sustainable DC complements with efficient software:<\/p>\n<ul>\n<li><strong>Efficient code<\/strong> uses less energy per request.<\/li>\n<li><strong>Well-designed serverless architectures<\/strong> consume only when used.<\/li>\n<li><strong>Energy-cost observability<\/strong>: per-service visibility.<\/li>\n<li><strong><a href=\"https:\/\/greensoftware.foundation\/\">Green Software Foundation<\/a><\/strong> principles.<\/li>\n<\/ul>\n<p>Mindset: not just DC-efficient, but also what runs inside.<\/p>\n<h2 id=\"what-doesnt-work-yet\">What Doesn\u2019t Work (Yet)<\/h2>\n<p>Critical:<\/p>\n<ul>\n<li><strong>\u201cCarbon neutral\u201d buying cheap offsets<\/strong>: greenwashing.<\/li>\n<li><strong>\u201cModular nuclear\u201d for DCs<\/strong>: interesting but not 2024 operational reality.<\/li>\n<li><strong>\u201cQuantum efficiency gains\u201d<\/strong>: marketing.<\/li>\n<li><strong>100% compensation with planted trees<\/strong>: dubious accounting.<\/li>\n<\/ul>\n<h2 id=\"practical-cto-decisions\">Practical CTO Decisions<\/h2>\n<p>If you operate your own DC or choose colo:<\/p>\n<ol type=\"1\">\n<li><strong>Ask real metrics<\/strong> (PUE, WUE, CUE) with evidence.<\/li>\n<li><strong>Validate \u201crenewable\u201d<\/strong>: direct PPA vs certificates.<\/li>\n<li><strong>Review cooling strategy<\/strong> \u2014 liquid is future.<\/li>\n<li><strong>Demand ERE reporting<\/strong> if local reuse options.<\/li>\n<li><strong>Workload portability<\/strong> to move by carbon.<\/li>\n<li><strong>Benchmark against hyperscalers<\/strong> (as ceiling reference).<\/li>\n<\/ol>\n<h2 id=\"conclusion\">Conclusion<\/h2>\n<p>Sustainable DCs in 2024 are beyond hype: liquid cooling is mainstream, carbon-aware workload scheduling is implementable, heat reuse has real cases, honest metrics are already a requirement. Serious ESG companies can\u2019t settle for PUE 1.5 and purchased certificates. European regulation will press harder in coming years. Those investing in real sustainability will have advantage \u2014 in cost (energy), reputation, and compliance. Those continuing greenwashing will have harder explanations.<\/p>\n<p>Follow us on jacar.es for more on sustainable infrastructure, efficiency, and data centers.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PUE efficiency no longer suffices. Liquid cooling, carbon-aware workload scheduling, waste-heat reuse. What works and what&#8217;s greenwashing.<\/p>\n","protected":false},"author":1,"featured_media":607,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,19],"tags":[422,418,360,420,421,419],"class_list":["post-606","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industria-4-0","category-tecnologia","tag-carbon-aware","tag-data-center","tag-energia","tag-pue","tag-refrigeracion-liquida","tag-sostenibilidad"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"en","enabled_languages":["es","en"],"languages":{"es":{"title":true,"content":true,"excerpt":true},"en":{"title":true,"content":true,"excerpt":true}}},"gutentor_comment":0,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sustainable Data Centers: What Changes in 2024 - Jacar<\/title>\n<meta name=\"description\" content=\"Data centers 2024: PUE vs WUE vs CUE, liquid cooling, carbon-aware workload scheduling, heat reuse, and European regulation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jacar.es\/datacenter-sostenible-2024\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sustainable Data Centers: What Changes in 2024 - 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