# Energy Use

> Part of: [Performance & Outcomes](/performance.md) · Provider: [DutchGreenhouses](/)

Greenhouse energy use is quoted in gigajoules per square metre per year and always temperature-corrected, since an uncorrected figure describes the winter rather than the building. It is the largest controllable operating cost, and every measure that reduces it costs something in light.

## Facts
| Property | Value |
|---|---|
| Dutch sector energy use | 0.99 GJ/m² per year |
| Share of sector energy supply that is carbon-free | 26 % |
| Required qualifier on any figure | Temperature-corrected qualifier |
| Cheapest lever | Screens measure |
| The trade that catches projects out | Energy against light trade-off |

Performance

# Energy.

    The bill that arrives every month for twenty years.

## Ask what the winter was doing

## The number, and the catch

Dutch greenhouses run at roughly one gigajoule per square metre per year.

That figure comes with a condition attached, and the condition matters as much as the number: it is temperature-corrected.

A mild winter makes any greenhouse look efficient. A hard one makes the same building look wasteful. Strip the correction out and you are no longer measuring the greenhouse — you are measuring the weather that year.

When someone shows you an energy figure, ask which winter it came from.

## Keep the heat in before you argue about where it comes from

Screens are the cheapest lever anyone has. They work every night of the season, so the saving compounds in a way a one-off equipment decision never does. In cold climates a second screen is simply standard.

The covering sets the baseline loss underneath that.

Only once the demand is as small as it is going to get does the heat source question become interesting — boiler, geothermal, heat pump. Choosing a source before cutting demand means buying a bigger installation than you needed.

## Every euro saved here can cost you a kilo

This is the trap.

A screen pulled shut for insulation is a screen standing between the crop and the sky. Light is yield, near enough one for one.

So a greenhouse optimised purely for low energy is a greenhouse that grows less. You can win the energy argument and lose the business.

The number that actually matters is energy per kilo produced, not energy per square metre.

## Lighting cuts both ways

Lamps buy winter production and add a continuous electrical load.

And the technology choice reaches further than people expect. High-pressure sodium throws warmth into the crop; LED does not. Switch to LED and lighting energy falls while heating demand rises. The two systems are one decision.

DutchGreenhouses® models heating, screening, lighting and covering as a single energy balance against the real climate of your site — the extremes, not the averages. Get in touch with a location and we will run it.

From the knowledge base

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## FAQ
**How much energy does a greenhouse use?**
The Dutch sector reference sits near one gigajoule per square metre per year, temperature-corrected, for 2024. The correction is part of the figure rather than a footnote: without it a mild winter makes any greenhouse look efficient and a hard one makes it look wasteful.

**What reduces greenhouse energy use most?**
Insulation first, because it compounds. Screens are the cheapest lever and a second screen is standard in cold climates; the covering sets the baseline loss. Only then does the heat source — boiler, geothermal or heat pump — determine the cost and emissions of the demand that remains.

**Does saving energy cost yield?**
It can, and the mechanism is direct. A screen closed for insulation is a screen costing light, and light converts to yield roughly one for one. This is why the meaningful target is energy per kilogram produced rather than energy per square metre alone.

**How does lighting affect the energy figure?**
It adds a continuous electrical load in exchange for winter production, and the technology choice changes the heating design too. High-pressure sodium radiates warmth into the crop that LED does not, so switching to LED can lower lighting energy while raising heating demand.

## Related
[Performance & Outcomes](/performance.md) · [Carbon Footprint](/performance/carbon-footprint.md) · [Yield](/performance/yield.md) · [Heating](/climate/heating.md) · [Energy Screens](/screening/energy-screens.md) · [Growlights](/growlights.md) · [U-Value](/glossary/u-value.md) · [Heat Pump](/glossary/heat-pump.md) · [Geothermal Energy](/glossary/geothermal-energy.md)