feat(efc): load balancer - MTA-6653 (#5783)

* fix(efc): lb efc

* fix(efc): lb pt 2

* fix(efc): lb pt4

* fix(efc): lb pt5

* fix(efc): review elise pt1

Co-authored-by: eauvray-github <[email protected]>

* fix(efc): review elise pt2

---------

Co-authored-by: eauvray-github <[email protected]>

Author: ldecarvalho-doc

pages/environmental-footprint/additional-content/bare-metal-env-footprint.mdx

@@ -17,7 +17,7 @@ At Scaleway the Bare Metal category includes different types of servers, such as
 This page includes the specificities of the environmental footprint calculation for Apple silicon and Elastic Metal servers.
 
 <Message type="important">
-The calculations also take into consideration all the elements described in the [Environmental Footprint calculation breakdown](/environmental-footprint/additional-content/environmental-footprint-calculator/) documentation page. Refer to said page for a full breakdown of the Environmental Footprint calculation performed at Scaleway.
+The calculations on this page take into consideration all the elements described in the [Environmental Footprint calculation breakdown](/environmental-footprint/additional-content/environmental-footprint-calculator/) documentation page. Refer to said page for a full breakdown of the Environmental Footprint calculation performed at Scaleway.
 </Message>
 
 For bare metal servers, the allocation of environmental impact is straightforward due to the direct association between a user and a server. The environmental impact of a bare metal server is entirely attributed to the user who operates it. This encompasses the energy consumption during its operation, as well as a portion of the impact from the server's manufacturing process.

pages/environmental-footprint/additional-content/block-storage-env-footprint.mdx

@@ -9,6 +9,9 @@ dates:
 
 This page includes the specificities of the environmental footprint calculation for Block Storage.
 
+<Message type="important">
+The calculations on this page take into consideration all the elements described in the [Environmental Footprint calculation breakdown](/environmental-footprint/additional-content/environmental-footprint-calculator/) documentation page. Refer to said page for a full breakdown of the Environmental Footprint calculation performed at Scaleway.
+</Message>
 ## Calculation aspects
 
 The total estimated impact of Block Storage volumes is calculated by integrating the:

pages/environmental-footprint/additional-content/instances-env-footprint.mdx

@@ -14,7 +14,9 @@ import image from './assets/scaleway-allocation-rules-instances.jpg'
 Discover how to measure your footprint for Instances on the Scaleway console.
 <GuideFlow src="https://app.guideflow.com/embed/9r25m0xazr"/>
 
-For Virtual Instances, the calculation of the environmental footprint takes into consideration all the elements described on the [Environmental Footprint calculation breakdown](/environmental-footprint/additional-content/environmental-footprint-calculator/) documentation page.
+<Message type="important">
+The calculations on this page take into consideration all the elements described in the [Environmental Footprint calculation breakdown](/environmental-footprint/additional-content/environmental-footprint-calculator/) documentation page. Refer to said page for a full breakdown of the Environmental Footprint calculation performed at Scaleway.
+</Message>
 
 ## Calculation aspects
 

pages/environmental-footprint/additional-content/load-balancer-env-footprint.mdx

@@ -0,0 +1,69 @@
+---
+title: Load Balancer Footprint Calculation
+description: This page explains how Scaleway calculates the environmental footprint of its Load Balancer product in detail.
+tags: load-balancer environmental-footprint impact networking
+dates:
+  validation: 2025-11-10
+  posted: 2025-11-10
+---
+
+Scaleway Load Balancers are built on top of the Instances infrastructure, meaning their environmental footprint is derived from the underlying virtual instances that power the service. The footprint calculation also accounts for additional control plane components specific to the Load Balancer service.
+
+This page details how the environmental impact of Load Balancers is calculated.
+
+<Message type="important">
+The calculations described on this page take into consideration all the elements described in the [Environmental Footprint calculation breakdown](/environmental-footprint/additional-content/environmental-footprint-calculator/) documentation page.
+</Message>
+
+## Calculation Aspects
+
+The total estimated environmental impact of the Load Balancer product integrates the following components:
+
+- **Dedicated manufacturing impact** – Related to the physical servers hosting the virtual instances that run the Load Balancer service.
+- **Related manufacturing impact** – Includes the impact of tools used to manage the service: control plane, monitoring systems, and internal networking infrastructure.
+- **Energy usage impact** – The average electricity consumption during operation, including associated data center infrastructure (PUE), network, and cross-IT equipment.
+
+### Allocation Methodology
+
+The Load Balancer product reuses the same environmental footprint model as [Instances](/environmental-footprint/additional-content/instances-env-footprint/), with impact allocated based on the underlying instance usage. All variables (e.g., server lifespan, energy mix, PUE) follow the definitions established in the [Environmental Footprint calculation breakdown](/environmental-footprint/additional-content/environmental-footprint-calculator/#definition-of-the-variables).
+
+Specifically:
+- **Datacenter and technical environment**: are calculated as defined in the global calculation methodology, and allocated according to the underlying instances.
+- **Network impact**: Allocated proportionally based on the underlying instances’ network usage.
+- **Customer servers**: Impact is calculated using the same method as for [Instances](/environmental-footprint/additional-content/instances-env-footprint/), and allocated according to instance usage.
+- **Cross-IT equipment & stock**: The base calculation follows the global methodology, with an **additional allocation** for equipment dedicated to the Load Balancer control plane.
+
+<Message type="note">
+The manufacturing and energy impacts are first computed at the Instance level, then attributed to Load Balancer usage based on resource consumption share.
+</Message>
+
+### Usage Impact
+
+- The energy consumption of Load Balancers is derived from the underlying instances. We use CPU usage as a proxy, applying [Boavizta’s consumption profiles](https://doc.api.boavizta.org/Reference/routes/#consumption-profile-routes) to estimate power draw.
+- The operational environmental impact of a service depends on two key factors: the **energy mix** of the host country and the datacenter's **PUE**. Refer to the [Calculation reference values](/environmental-footprint/additional-content/calculation-values-reference) documentation page to find the values corresponding to your region.
+
+#### Calculation Example
+
+Assume a Load Balancer runs on an underlying Instance with:
+- **Power consumption:** 110 W (0.110 kW)
+- **Usage duration:** 100 hours
+- **French energy mix:** O,065kgCo2e/kwh
+- **Datacenter's PUE:** 1,16
+
+**Energy Usage Impact**:
+```math
+UsageFootprint = 0.110 * 100 * 0.065 * 1.16 = 0.825 kgCO2e
+```
+
+**Manufacturing Impact** (6-year lifespan = 52,560 hours, example manufacturing impact = 850 kgCO2e):
+
+```math
+ManufacturingImpact = (100 / 52560) * 850 * 0.5 = 0.81 kgCO2e
+```
+
+This means that the total footprint for 100 hours of Load Balancer usage, in this case, is **1.635 kgCO2e**
+
+<Message type="important">
+Water consumption is derived from the same energy usage value, multiplied by the [Water Usage Effectiveness (WUE)](/environmental-footprint/concepts/#water-usage-effectiveness) of the datacenter. This applies to zones where WUE data is available (FR-PAR-1, FR-PAR-2, FR-PAR-3, NL-AMS-1).
+</Message>
+

pages/environmental-footprint/additional-content/object-storage-env-footprint.mdx

@@ -10,6 +10,10 @@ dates:
 
 This page includes the specificities of the environmental footprint calculation for Object Storage.
 
+<Message type="important">
+The calculations on this page take into consideration all the elements described in the [Environmental Footprint calculation breakdown](/environmental-footprint/additional-content/environmental-footprint-calculator/) documentation page. Refer to said page for a full breakdown of the Environmental Footprint calculation performed at Scaleway.
+</Message>
+
 ## Calculation aspects
 
 The total estimated impact of Object Storage volumes is calculated by integrating the:

pages/environmental-footprint/menu.ts

@@ -56,6 +56,10 @@ export const environmentalFootprintMenu = {
         {
           label: 'Object Storage footprint calculation',
           slug: 'object-storage-env-footprint'
+        },
+        {
+          label: 'Load Balancer footprint calculation',
+          slug: 'load-balancer-env-footprint'
         }
       ],
       label: 'Additional Content',