Green hosting vs conventional hosting: how much CO₂ do you save?

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Información del Artículo

Publicado: February 13, 2026

Actualizado: September 17, 2026

Tiempo de lectura: 5 minutos

Palabras: 932

Categorías: Replanta, Web Hosting Ecológico

Autor: Catalina Zapata (Project Manager)

Choosing a green hosting is not just a marketing decision: it can directly reduce the carbon footprint of your website and, combined with performance optimizations, translate into measurable CO₂ savings. In this comparison, I explain how each type of hosting works, why metrics like the PUE, how the footprint per visit is calculated, and I give you practical examples to estimate how much CO₂ you can save by migrating to ecohosting.

What exactly is a “green hosting” (ecohosting)?

A green hosting (or ecohosting) usually meets one or more of these conditions:

Operates with 100% renewable energy in its data centers (solar, wind, etc.) or purchases certified renewable energy.
Offsets its emissions through certified projects (reforestation, carbon credits), in addition to real consumption reduction.
Has energy efficiency policies (low PUE, efficient cooling, responsible resource use).
Is verified by initiatives such as Green Web Foundation (green supplier registration and IP verification).

If a supplier appears in the database of the Green Web Foundation, their IP and tests are public: it’s a simple way to verify if a host operates “green” transparently.

Conventional hosting: what does it emit and why?

The conventional hosting usually relies on the general electrical grid of the country, which in many places still partially depends on fossil fuels. In addition, data centers with outdated infrastructure or without optimization have PUE high (more energy used for cooling and infrastructure for each unit used in IT), which increases total emissions per unit of computing or data transfer. The global consumption of data centers is significant and has been increasing with demand (AI, streaming, cloud).

What is PUE and why does it matter? (explained simply)

PUE (Power Usage Effectiveness) = (Total energy consumed by the data center) ÷ (Energy consumed by IT systems).

A PUE of 1.1 (very efficient) means that only ~10% of the total energy is wasted on infrastructure.
A PUE of 1.5 indicates higher overconsumption in cooling and auxiliary systems.

Large operators publish efficient PUEs (for example, Google reports PUEs close to 1.09 in its large-scale centers). A lower PUE reduces the emissions associated with each operation that your site needs.

How is CO₂ per visit estimated and how much can be saved?

Tools like Website Carbon and libraries like CO2.js use models that combine: page size (KB/MB), number of requests, network efficiency, and energy mix of the country/provider to calculate grams of CO₂ per page load. According to Website Carbon, the global average per page view is around 0.36 g CO₂ per pageview (varies by methodology and site). For a site with 10,000 visits/month, that amounts to ~43 kg CO₂/month in its estimate.

Practical example (estimate)

Site A (conventional hosting, without optimizations): 1.0 g CO₂ per visit → 10,000 visits/month = 10 kg CO₂/month.
Site B (same traffic, migrated to green hosting that uses renewables and has good PUE): 0–0.05 g CO₂ per visit (according to method and level of compensation), reducing emissions by up to 90–100% in direct operational emissions (scope 2) attributable to hosting.

Note: the actual reduction depends on the calculation methodology (some models measure only electricity used in transfer, others include the production of the energy mix). For reproducible estimates, we recommend using Website Carbon or CO2.js and noting the methodology.

Does migrating to green hosting really eliminate emissions? Important nuances

Scope 2 (electricity): if the hosting is powered by renewables (or purchases renewable energy certificates), direct emissions from operation can be drastically reduced or considered offset.
Scope 3 and embedded emissions: hardware manufacturing, indirect cooling, and network infrastructure still exist; migrating does not erase everything.
Offsets vs real energy: some providers buy offsets; others deliver direct renewable energy. Check documentation and certifications (Green Web Foundation and public reports).

Summary comparison (advantages / disadvantages)

Green hosting (ecohosting)

Advantages: smaller operational footprint, possible efficient PUEs, good storytelling and alignment with eco mission. Validable via Green Web Foundation.
Disadvantages: some green providers use offsets instead of direct energy; compare transparency and metrics.

Conventional hosting

Advantages: price or ubiquity (large cloud providers).
Disadvantages: higher risk of emissions (dependent on energy mix), variable PUE, greater impact if the site is not optimized.

Good practices when choosing an ecohosting (quick check)

Check Green Web Foundation : is the provider verified?
Request PUE and technical evidence : transparency in metrics.
Prefer direct renewable energy over just offsets.
Combine green hosting + web optimization (images, lazy load, local fonts) to multiply the effect of CO₂ reduction.

Case study: how much CO₂ can you save in figures (quick estimate)

Site with 50,000 pageviews/month and average weight 1.5 MB: Website Carbon estimates ~0.36 g/pageview on average → ~18 kg CO₂/month.
By migrating to hosting with renewables and applying performance optimizations (−40% weight), you could drop to ~0.1 g/pageview → ~5 kg CO₂/month. In the long run, this represents dozens of kg of CO₂ avoided per year per site, and important figures if scaled to hundreds of sites.

Tools and resources (to measure and verify)

Website Carbon — estimates per pageview and quick reports.
CO2.js / Green Web Foundation — methodologies and verification of green suppliers.
IEA reports / sector reviews — to understand the context of data center consumption and the growth trend.

Conclusion: is it worth migrating to green hosting?

Yes —especially if you combine the migration with good optimization practices. Migrating to a verified green hosting can drastically reduce the operational emissions associated with your website (scope 2), and if your site is also lightweight and efficient, the total environmental impact can drop significantly. Additionally, you improve speed, user experience, and SEO ranking: a win-win.