How to Cook Without Setting Fire to Your Energy Bill 

Put the lid on

This is the one everybody knows and almost nobody does.

A lid traps heat instead of letting it wander off to warm your ceiling instead of your dinner. Water boils faster. Food cooks in less time. You can use up to two or three times less energy for the exact same meal, according to study.

While you’re at it: your vegetables do not need to go swimming. A thin layer of water is plenty — enough that the pan won’t boil dry, not enough to run a small lido. Less water, less energy, and your vitamins survive the ordeal too.

Reading tip: if “less water, fewer vitamins lost” appeals to you, you’ll probably enjoy our guide to How to keep your avocados fresh – and 5 more zero food waste tips 

Match the pan to the burner

Small confession: most of us grab whatever pan is nearest, plonk it on a burner, and turn the dial without a single further thought.

But if the flame spills out past the edges of the pan, that heat isn’t cooking your dinner. It’s heating your kitchen air, and eventually your bill. Same goes in reverse: a big pan on a small burner just means uneven cooking and a longer wait.

It’s such an obvious fix that it feels almost rude how well it works.

Let one pan do the work of four

Running every burner at once for a single meal is the kitchen equivalent of leaving every light on in an empty house “just in case.”

Stews, risottos, curries, traybakes, stir-fries — anything that happens in one vessel uses one heat source instead of several, and leaves you with a fraction of the washing up. Which, let’s be honest, is really the deciding factor here.

Don’t fight your freezer

Pull meat or veg out in the morning instead of wrestling with them under lukewarm tap water at 6pm like it’s some sort of hostage negotiation.

Same goes for fridge ingredients, take them out the moment you walk in, before you’ve had the chance to collapse onto the sofa and lose all momentum for the evening. By the time you’re actually cooking, everything’s at room temperature, which means less energy spent coaxing cold food back to life.

Reuse your cooking water

Potatoes and green beans are allowed to share a pan. Nobody’s checking.

The trick is timing: whatever takes longest goes in first, and the quicker things join later, so everything finishes together. One pot, one lot of water, one fewer thing to feel faintly guilty about.

Slow cooking

Heat doesn’t vanish the second you turn the dial. Water stays hot. Pans stay hot. Ovens stay very smugly hot for ages after you’ve stopped paying for them to be.

So turn things off a few minutes before they’re “done,” and let residual heat finish the job while you lay the table or stand in front of the fridge deciding what to drink.

Rice trick, while we’re here: cook it for ten minutes, then wrap the pan in a towel and leave it alone. By dinner it’s perfect. This isn’t a hack. It’s just physics, quietly doing you a favour.

Ease off the extractor fan

It uses energy too, and half the time it’s on purely out of habit rather than necessity.

• Keep it low, or off, or crack a window instead — warm air finds its own way out without encouragement
• Use the fan-assisted oven setting where you can; it uses less energy than conventional top-and-bottom heat, and the better air circulation means two dishes can often go in at once

One of the rare cases where “more efficient” and “more convenient” turn out to be the same thing.

By the way, did you know that the hot air function of your oven uses the least amount of energy? Less than the conventional mode with top and bottom heat. And because of the good air circulation, a hot air oven is even suitable for cooking two dishes at the same time.

Check your pans aren’t secretly the problem

No need for a new set of cookware — just check the ones you’ve got have flat, even bottoms.

A warped pan means uneven heat, which means longer cooking, which means more gas or electricity for the same bowl of pasta. Unglamorous advice, but free to check and mildly satisfying once confirmed innocent.

Cook once, eat three times

Batch cooking isn’t a lifestyle. It’s just cooking, but slightly more than you need, on purpose.

Cook once, portion it, freeze what you’re not eating this week. Reheating uses far less energy than starting from scratch each time, and future-you gets dinner sorted for the price of absolutely nothing extra.

Reading tip: for more on turning one big cook into several lazy dinners, see our zero-waste meal prep ideas.

The one tip that costs money: a pressure cooker

Everything else here is free. This one isn’t — but it earns its keep.

A pressure cooker can cut both cooking time and energy use by 60–70%, uses very little water, and holds onto more nutrients in the process. If you cook often enough for the maths to work, it pays for itself. If not, skip it with a completely clear conscience.

Let the air fryer earn its counter space

For the right dishes, an air fryer heats a much smaller space than a full oven and gets there faster — which tends to add up over a few months according to study,

Nobody’s air-frying a lasagne, to be clear. But for roast veg, chips, or reviving last night’s leftovers, it’s one of the genuinely useful additions to a kitchen trying to waste less without trying harder.

Looking for recipe inspiration? Jamie Oliver (my favorite cook) made you a whole book of Easy Air Fryer recipes.

Let the kettle do the boiling

Boiling water in a pan on the hob is one of the more quietly wasteful things we do without noticing.

A kettle boils water faster and with less energy than a hob ever will — so if a recipe needs boiling water, boil it in the kettle first, then tip it into the pan. Same water, same pasta, considerably less standing around waiting for bubbles.

It’s not glamorous. It is, however, the laziest possible upgrade on this entire list — which, if you’ve been paying attention, is exactly the point.

That’s how you save money in the kitchen

None of this requires becoming a different kind of cook, or spending a Sunday reorganising your kitchen life around a system.

Pick two or three of these, stick them on the fridge, and let them turn into habits the way most good habits arrive: slowly, and mostly by accident.

That’s the cheapest way to cook, in the end: not by trying harder, but by being lazy in exactly the right places – the lid, the kettle, the extra portion in the freezer – and letting heat, water, and effort stop leaking out of things that were never asking for them anyway.