What Is a Smart Plug and 10 Ways to Use One

If you've been curious about smart home tech but don't know where to start, a smart plug is the answer. It's the cheapest, simplest gadget in the smart home world — and arguably the most useful. For less than the price of a takeaway, you can make almost any appliance in your house controllable from your phone.

Here's everything you need to know, plus ten practical ways to put one to work.

A smart plug is a small adapter that sits between your wall socket and an ordinary appliance. It connects to your home WiFi, which means you can switch whatever's plugged into it on or off remotely — from your phone, on a schedule, or with your voice via Alexa, Google Assistant or Apple Home.

The clever part is that the plug does the thinking, not the appliance. Your lamp, kettle, or fan doesn't need to be "smart" at all. If it has a plug and turns on when it gets power, a smart plug can control it.

Setup usually takes under five minutes: plug it in, open the manufacturer's app, connect it to your WiFi, and give it a name. That's it.

• Voice assistant compatibility — check the box for Alexa, Google Home or Apple HomeKit support, depending on what you use.
• Energy monitoring — some models track exactly how much electricity the connected device uses. Well worth having, as you'll see below.
• Maximum load — most UK smart plugs are rated to 13A (around 3kW), which covers heaters and kettles, but always check before plugging in anything power-hungry.
• Size and shape — bulkier plugs can block the second socket on a double outlet. Slimline designs avoid this.

Plug in an electric heater and schedule it to come on 30 minutes before your alarm. On cold mornings, you'll get out of bed into a warm room without paying to heat it all night. (Just make sure the heater is one that's safe to run unattended, positioned away from anything flammable.)

The classic first use. Schedule your living room lamps to fade into life at sunset, or shout "Alexa, turn off the bedroom lamp" without leaving your duvet. No rewiring, no smart bulbs required.

Set your lamps — and maybe a radio — to switch on and off at realistic times while you're on holiday. Most apps include a "random" or "away" mode that varies the timing slightly each day, which looks far more convincing than a rigid timer.

TVs, consoles, printers and chargers all sip electricity in standby mode, and it adds up over a year. Group them on smart plugs and set a "goodnight" routine that cuts power to the lot at midnight. A model with energy monitoring will show you exactly what you're saving.

Plug your straighteners or iron into a smart plug and you can check — and switch them off — from the train. Better still, set an auto-off timer so they can never run for more than 20 minutes. Peace of mind for the chronically anxious (all of us).

Load up a filter coffee machine the night before and schedule the plug for 7am. You'll wake up to the smell of fresh coffee like you live in an advert. This works with any machine that starts brewing as soon as it gets power — check yours before committing to the dream.

Christmas tree lights, garden fairy lights, Halloween decorations — schedule them to come on at dusk and off at bedtime, and never crawl behind the tree to reach the switch again. 

Fish tank lights, reptile heat lamps and greenhouse propagators all need consistent on/off cycles. A smart plug handles the routine automatically and keeps things running to schedule even when you're away for the weekend.

Leaving e-bikes, e-scooters, power tools and laptops on charge for days isn't great for their batteries. Set the plug to cut power after a few hours, or schedule charging overnight to make the most of cheaper off-peak electricity tariffs.

WiFi playing up? If your router is on a smart plug, you can power-cycle it from the app rather than fishing behind the TV cabinet. Some plugs can even do this on a weekly schedule to keep things running smoothly. One tip: give the plug a scheduled off-and-on rather than a plain "off", or you'll cut off the WiFi the plug itself relies on.

Smart plugs work best with appliances that have a simple mechanical on/off switch. Devices that need a button press after power-up — like most microwaves, modern TVs and some coffee machines — will only go into standby when the plug switches on.

What does a smart plug do?

A smart plug turns any ordinary appliance into one you can control remotely. Plug it into a wall socket, plug your appliance into it, and you can switch that appliance on or off from your phone, set schedules, or use voice commands through Alexa, Google Assistant or Apple Home. Many models also track how much electricity the appliance uses, so you can spot the energy hogs in your home.

What's the difference between a smart plug and a normal plug?

A normal plug simply passes power to your appliance; a smart plug adds a Wi-Fi-controlled switch in between. That means you can turn the socket on or off from anywhere, automate it on a timer, trigger it with other smart devices, and (on models with energy monitoring) see exactly what the appliance costs to run. Physically, a smart plug is just an adapter that sits between the socket and your appliance's existing plug — no rewiring involved.

What should you not plug into a smart plug?

Avoid anything high-powered or safety-critical. That means electric heaters, immersion heaters and large appliances such as ovens, washing machines and tumble dryers — these can draw more current than the plug is rated for and create a fire risk. Also avoid anything that shouldn't be switched off unexpectedly, such as medical equipment, or a fridge or freezer. In the UK, check the plug's rating: most smart plugs are rated to 13A (around 3,000W), but cheaper models may be rated lower, so always check before connecting anything power-hungry.

What are the disadvantages of smart plugs?

The main drawbacks are Wi-Fi dependence, app overload and suitability. Most smart plugs need a working Wi-Fi connection for remote control (schedules usually keep running locally if your internet drops). If you mix brands, you can end up juggling several apps — buying plugs that support a common ecosystem like Alexa, Google Home or Matter solves this. They also add a little bulk to the socket, which can be awkward behind furniture, and they only suit appliances with a physical on/off switch that stays "on".

Do smart plugs use electricity when switched off?

Yes, but only a tiny amount. A smart plug draws a small standby current — typically around 0.5 to 1 watt — to stay connected to your Wi-Fi. At current UK electricity prices, that works out to roughly £1–£3 per plug per year. If you use the plug to cut standby drain from devices like TVs, set-top boxes and games consoles, it will usually save far more than it consumes.

Do smart plugs save money on your electricity bill?

They can, if you use them to eliminate standby waste and run appliances at cheaper times. Scheduling devices to switch fully off overnight, killing standby power on entertainment systems, and using energy-monitoring plugs to identify wasteful appliances all chip away at your bill. If you're on a time-of-use tariff (such as an EV or Economy 7 tariff), a smart plug can also shift flexible loads — like charging devices — into your cheap-rate hours automatically.

Do smart plugs work without Wi-Fi?

Partially. Most smart plugs need Wi-Fi for remote control and voice commands, but schedules you've already set typically continue to run locally, and you can always use the manual button on the plug itself. Some newer plugs also support Bluetooth or local standards like Matter over Thread, which allow control on your home network even when your broadband is down. If you don't have Wi-Fi at all, a remote-controlled plug is the better choice.

Are smart plugs safe to use in the UK?

Yes — provided you buy from a reputable brand and stay within the plug's rated load. Look for UK three-pin models with a 13A rating, a genuine CE/UKCA mark, and built-in protections such as overload cut-off. Avoid unbranded imports, don't daisy-chain smart plugs with extension leads for high-power devices, and never use them with heaters or other appliances that pose a fire risk if switched on unattended.

A smart plug is the ideal gateway into the smart home: cheap, genuinely useful from day one, and requiring zero technical skill. Start with one on a living room lamp, and don't be surprised when you're back for a four-pack within the month.

Shop our range of Smart Plugs today, or start upgrading your house to turn it into your ideal smart home with our full range of Shelly Smart Tech.