How to Save Energy While Cooking

Cooking doesn't seem like a big energy line item compared to heating or cooling — and it isn't. Cooking accounts for about 3–5% of a typical home's electricity use. But 3–5% is still $45–$75 a year in a typical household, and unlike big-ticket upgrades, this is money you can recoup starting tonight, with habits that don't require buying anything.

The trick isn't cooking less. It's cooking more efficiently. Here's what actually moves the needle.

The five habits that matter most

1. Match the pot to the burner

A 6-inch pot on an 8-inch burner wastes 40% of the burner's heat into the air around the pot. Always use the smallest burner that fits the pot's base, or the smallest pot that covers the burner. On an electric coil stove, the pot should sit flat and cover the coil entirely — if the coil glows orange beyond the pot's edge, you're wasting energy.

This one change saves 10–20% of cooking energy for most homes, and it's free.

2. Keep the lid on

A lid traps steam and heat. It's the single biggest cooking energy saver. Cooking pasta, rice, soups, and vegetables with a lid reduces the energy needed by up to 25%. You can also lower the burner setting once the pot comes to a boil — with the lid on, most foods will continue cooking at a simmer just fine.

The exception: recipes that require reduction or crisping. For those, leave the lid off — but only when the recipe actually calls for it.

3. Turn off the burner early

Electric coil burners and cast iron pans hold heat for a surprising amount of time after you turn them off. If you're cooking something that needs 5 minutes of simmering, turn the burner off at 4 minutes and let the residual heat finish the job. For oven-baked dishes, turn the oven off 5–10 minutes before the timer goes off — the oven will hold its temperature long enough to finish the bake.

4. Use the right appliance for the job

Not every meal needs an oven. Compare energy costs for the same small meal (a portion of leftovers, a single-serve dish, a bowl of soup):

• Microwave: $0.02–$0.04 per use
• Toaster oven: $0.05–$0.08 per use
• Air fryer: $0.06–$0.10 per use
• Full electric oven: $0.20–$0.40 per use

For a single portion or small meal, the microwave uses roughly one-third the energy of the oven. Toaster ovens and air fryers use about half. Reserve the full oven for meals that actually fill it — a casserole, a batch of cookies, a roast.

5. Don't peek in the oven

Every time you open the oven door, you lose 25–30°F of interior heat. The oven then has to work hard to recover, which uses more energy and can throw off your recipe's timing. Use the oven light and window to check progress. If you must open the door, do it once and quickly.

Additional tips that add up

Preheat only when you need to

Modern ovens preheat in 8–12 minutes. Recipes that bake for over an hour (casseroles, roasts) don't need preheating at all — the extra 10 minutes at the start is included in the cook time. Only preheat for baking, where a hot oven matters for structure.

Use the right pan material

Cast iron and dark-colored pans absorb heat faster and cook food evenly at lower settings. Glass and ceramic retain heat better than metal — you can often reduce oven temperature by 25°F when using glass.

Batch your oven use

If the oven is on, use it fully. Roast vegetables alongside the main dish. Bake dessert right after the casserole. A full oven uses the same energy as a mostly-empty one, so use the space.

Use a pressure cooker or slow cooker for beans and stews

A slow cooker uses 100–200 watts to cook a stew for 6 hours — about $0.10 total. A pressure cooker cooks the same stew in 30 minutes on low power. Both beat simmering on the stove for two hours, which uses 3–4 times more energy.

Boil water in a kettle, not on the stove

An electric kettle heats water faster and uses 30–50% less energy than a pot on the stovetop, because the heating element is directly in contact with the water. For pasta, tea, coffee, or anything else that starts with boiling water, use the kettle and then pour it into the pot.

Defrost in the fridge, not the microwave

Moving frozen food to the fridge the night before uses zero additional energy — the cold food actually helps cool the fridge. The microwave defrost cycle uses $0.05–$0.10 of electricity per thaw.

What it all saves

For a household that cooks at home 5 nights a week:

• Lid on, right pot, right burner: $20–$30/year
• Microwave / toaster oven instead of full oven: $30–$50/year
• Turning off burner early + residual heat: $5–$10/year
• Kettle instead of stovetop boiling: $5–$10/year
• Batch baking and preheating discipline: $10–$20/year

Total: $70–$120 per year, with zero upfront cost. In summer, there's an extra benefit: less heat in the kitchen means the AC runs less, which doubles the effective savings.

Frequently Asked Questions