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Draft storyAt the bio plant

Two useful branches

Zara learns why the bio plant’s two routes go to two different places.

A draft: the words and pictures are waiting for an educator’s review.

Who’s in it

Meet everyone in Gullbrae

The story

Zara and Isla open a small wooden teaching case holding a sealed tank picture, an energy cabinet card, a field card and two coloured strips, amber and teal, with Amina beside them.

At the bio plant, Zara and Isla opened a wooden teaching case. Two coloured strips led away from the tank picture, like two arrows going to different places.

Zara: “Can you show me how that works?”

Eddie holds both the amber and teal strips towards the energy cabinet card while Amina raises an open hand to pause him and Zara and Isla watch.

Eddie tried to send both strips to the same energy cabinet card. Amina gently paused him before he finished.

Amina lays the amber strip beside the closed energy cabinet card while the teal strip and the field card stay apart on the other side of the case.

Amina laid the amber strip by the energy cabinet. One thing made in the tank is a gas called biogas, and it goes to suitable energy equipment.

Amina holds the field card beside a small tablet with a checking screen, with the teal strip next to her and the energy card apart, while Eddie listens.

Then Amina picked up the field card. The other thing from the tank, called digestate, is checked first, before it can be used as a suitable fertiliser.

Zara, with Isla right beside her, matches the amber strip to the energy cabinet card and the teal strip to the field card while Amina watches.

Zara put the two strips back where they belonged: amber to the energy cabinet, and teal to the field. Two separate routes, side by side.

For grown-ups: The sealed tank has two separate routes out. The amber route takes biogas to suitable energy equipment. The teal route takes digestate through checks before it is used as a suitable fertiliser on a field. The coloured strips are only props, not labels.

Zara proudly shows the finished teaching case to Eddie and Amina, with Isla beside her and the two strips leading to separate cards.

Zara showed Eddie the finished case. The tank had two useful branches, not one magic product, and each one went somewhere different.

Draft, 20 October 2026. The words and pictures are not yet reviewed by an educator. The story follows the outline in our story guide.

The real-life bit

A bio plant gives two separate outputs: biogas for suitable energy equipment, and digestate, which is checked before it can be used as a suitable fertiliser. A field is somewhere that fertiliser may go under professional care, and household scraps should never be fed to farm animals. Save good food first, and follow your council’s own rules for food scraps. Gullbrae is made up. Your council’s own rules are the ones to follow.

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