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

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Información del Artículo

Publicado: February 13, 2026

Actualizado: September 30, 2026

Tiempo de lectura: 5 minutos

Palabras: 858

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 an 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.
Can finance external reforestation projects. That contribution does not demonstrate a smaller footprint of the service nor changes the source of its electricity.
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 proofs 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. Additionally, data centers with outdated infrastructure or without optimization have PUE high (more energy used for cooling and infrastructure for each unit used in IT), which increases total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 means 1.1 units of total energy for every unit used by IT equipment. Auxiliary services account for 0.1 units, approximately 9.1% of the total.
A PUE of 1.5 indicates higher overconsumption in cooling and auxiliary systems.

The PUE describes the energy efficiency of the data center. It does not solely measure the carbon of a visit: electricity, workload, and the perimeter of the calculation also matter.

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

Calculators use models and assumptions to estimate emissions per visit. As a purely arithmetic example, 0.36 g per visit multiplied by 10,000 visits equals 3.6 kg. It is not a measurement or an average attributed to your website.

Practical example (estimation)

Illustrative scenario A: if the model estimates 1 g per visit, 10,000 visits equal 10 kg.
Illustrative scenario B: if a new assessment with the same perimeter estimates 0.8 g per visit, 10,000 visits equal 8 kg. The estimated difference would be 20%; it is not a guaranteed reduction by migrating.

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

Electricity: distinguishes between consumption and renewable supply instruments from offsets. The hosting acquired is not automatically Scope 2 for the client; its classification depends on the inventory.
Scope 3 and embedded emissions: hardware manufacturing, indirect cooling, and network infrastructure still exist; migrating does not erase everything.
Purchases of renewable electricity and carbon offsets are distinct instruments. Review the scope, period, and criteria of the evidence for each one.

Summary comparison (advantages / disadvantages)

Green hosting (ecohosting)

Advantages: lower operational footprint, possible efficient PUEs, good storytelling, and alignment with eco mission. Verifiable 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 the energy mix), variable PUE, greater impact if the site is not optimized.

Best practices when choosing 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.

Practical case: how much CO₂ can you save in figures (quick estimate)

Arithmetic example, not measured result: 50,000 visits at 0.36 g per visit equals 18 kg.
If another comparable assessment gave 0.30 g per visit, the result would be 15 kg. Only an analysis with consistent data, method, and assumptions allows attributing a difference to specific changes.

Tools and resources (for measuring and verifying)

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

Conclusion: is it worth migrating to green hosting?

Compare location, documented electricity, efficiency, and technical needs. Optimizing a website can reduce transferred resources, but reducing emissions requires an assessment with a defined perimeter. Migrating or planting trees does not eliminate the entire footprint.