S4 Energy

An energy transition company has a special communication challenge. The topics are technically complex; battery storage, grid balancing, frequency containment, but the target audiences are diverse. Investors want to know what sets the company apart. Grid operators want to see technical capability. Landowners and municipalities want to understand what such a project means for their site. Potential employees want to see if the company suits them.

S4 Energy wanted a website that serves these different audiences simultaneously, in two languages, with a clear structure and a modern look befitting a frontrunner in energy transition.

Along with the website, a restyling of the corporate identity went ahead, carried out by design agency Het Stormt. The new website not only had to match the content but also be the digital carrier of the new brand identity.

We developed a multilingual multisite in Craft CMS consisting of two websites that complete the S4 Energy brand. The main website focuses on the corporate target groups: business partners, grid operators, investors and stakeholders around specific projects. The Working at site focuses entirely on recruitment and employer branding.

Both websites share a common base, corporate identity and technical infrastructure, but each has its own domain, navigation structure and content approach. This gives S4 Energy the flexibility to choose the right tone for each target group without the websites growing apart technically.

The design came about in close cooperation with Het Stormt. While they worked out the brand's strategy and visual identity, we contributed ideas for logo variants and translated the design into a working, scalable web platform. That collaboration ensured that brand and technology aligned from the start.

The full website is available in Dutch and English, with an intuitive language changer and full translation of both content and metadata.

Battery storage is a niche sector with its own language. Terms like frequency containment reserves, automatic frequency restoration and ancillary services are obvious to insiders but abstract to a landowner or municipal official.

The challenge was in finding the right layer per page. The corporate website must be technically credible for an engineer from a grid operator, but also accessible for a journalist writing about the energy transition. This requires careful construction of pages where the complexity is delivered in layers.

In addition, the integration of the new house style in the digital environment required attention. A static house style on paper does not automatically translate into a responsive website with moving elements, scalable components and different viewports. We ensured a translation that does justice to Het Stormt's identity and at the same time works on any device.

Craft CMS as the basis for both sites in a shared multisite environment. Tailwind CSS for the front-end styling, in line with Het Stormt's new corporate identity. Fully multilingual with automatic language routing and separate URL structures per language. Extensive page blocks for independent content management by the team. Work at site with vacancy management and integration with job board indexing. Optimisation for search engines in both Dutch and English.

Since January 2026, S4 Energy has a website that matches their position as the Dutch leader in large-scale battery storage. The corporate website clearly communicates what the company does and for whom, in two languages and for different target groups. The Working at site supports the team's growth in the Netherlands and Germany.

The platform grows along with S4 Energy. New projects, expansions into new markets and changing propositions can be implemented independently by the team via Craft CMS.

Working with a design agency like Het Stormt requires clear agreements on roles, pace and final responsibility. When the collaboration is right as in this project, these different perspectives reinforce each other. A good designer creates a strong house style, a good technical agency ensures that this house style also works in production, and together something is created that one of the two parties could not have delivered alone.

For the customer, this means one coordinated process instead of two separate projects. For us, it means the opportunity to focus on what we do well, technology and digital translation, without compromising on visual quality.