Best Smart Plugs for Tracking Electricity Usage in Shared Rentals

Electricity bills become uncomfortable in shared rentals for a simple reason: the utility meter tells you what the apartment used, not what each roommate or appliance used.

One person may run a gaming PC every evening. Another works from home with two monitors. Someone has a portable dehumidifier. The refrigerator, Wi-Fi router, TV, and kitchen appliances are shared. Splitting the final utility bill equally is simple, but it can feel unfair when usage patterns are very different.

An energy-monitoring smart plug gives you a much narrower measurement point.

Put one between the wall outlet and an appliance and it can typically show:

• real-time watts;
• cumulative kilowatt-hours;
• historical usage;
• on/off schedules;
• and, on some platforms, estimated electricity cost.

That makes smart plugs useful for transparency.

It does not automatically make them official billing meters.

This guide compares the strongest current smart plugs for shared rentals and explains how to use the data without turning your apartment into an argument about every phone charger.

Top Picks at a Glance

Model	Best for	Energy data	Shared-rental advantage	Main limitation
Tapo P110M	Best overall	Real-time + historical kWh + cost estimates	Compact, Matter, rate input, schedules	Cost estimate still does not represent every utility-bill charge
Emporia Smart Plug	Best detailed monitoring	Watts, voltage, cumulative kWh, second-level cloud reporting	Excellent for comparing actual appliance behavior	U.S. continuous-load rating is 10A
Shelly Plug US Gen4	Best local / advanced automation	Power measurement + energy data	Matter, Wi-Fi, Zigbee, Bluetooth, strong automation options	More technical ecosystem
Eve Energy	Best privacy-first option	Consumption + projected cost	No Eve cloud, no registration, Thread + Matter	Best energy features depend on supported platform/app
Tapo P316M	Best common-area power strip	Per-outlet energy monitoring	Six individually measured AC outlets	Measures only devices connected to the strip

Also worth considering: Kasa KP125M if you already use the Kasa ecosystem. It combines Matter, real-time and historical monitoring, rate-based bill estimates, compact hardware, and a 15A/1800W U.S. rating.

What a Smart Plug Actually Measures

The basic energy math is straightforward.

Power is the instantaneous electrical load, usually shown in watts.

Energy is power accumulated over time, usually shown in kilowatt-hours:

1 kWh = 1,000 watts used for one hour

A 500-watt device running for four hours uses approximately:

500 W × 4 h ÷ 1000 = 2 kWh

If electricity costs $0.20 per kWh:

2 kWh × $0.20 = $0.40

This is exactly the kind of calculation energy-monitoring smart plugs automate.

Why kWh matters more than the live watt number

Real-time watts are useful for identifying a power-hungry device.

Historical kWh is what helps with cost allocation.

A gaming PC may draw 500W during a demanding game but much less while browsing. A dehumidifier cycles on and off. A coffee maker draws substantial power for only a short period.

Monthly kWh captures those behavior differences better than one instantaneous reading.

1. Tapo P110M — Best Overall for Most Shared Rentals

Best for: roommates who want useful energy data without becoming energy engineers
Energy tracking: yes
Cost estimates: yes
Matter: yes
Schedules: yes
Compact form factor: yes

Tapo P110M is the most balanced option in this comparison.

The official U.S. product page supports:

• real-time energy information;
• historical usage;
• electricity-rate input;
• estimated energy bills;
• schedules;
• remote control;
• Matter integration.

That combination is unusually useful in a shared apartment.

Why the bill estimate feature matters

You can enter an electricity rate into Tapo and convert energy use into an approximate dollar amount.

This makes a roommate discussion easier.

Instead of saying:

“Your PC uses a lot of power.”

you can say:

“This plug recorded 42 kWh this month.”

That is a much better starting point.

Time-of-use rates

Tapo’s energy interface also supports flexible billing information, including time-based electricity rates in supported versions.

That can be valuable when a utility charges:

• a cheaper overnight rate;
• expensive peak-afternoon electricity.

A schedule can then shift compatible appliances to lower-cost hours.

Good for a mixed smart home

P110M supports Matter and major ecosystems including:

• Apple Home;
• Amazon Alexa;
• Google;
• Samsung SmartThings.

That is useful in a shared rental because roommates may not all use the same phone ecosystem.

Best devices to monitor

Good examples:

• gaming PC setup;
• desktop workstation;
• television;
• fan;
• humidifier;
• dehumidifier within rated limits;
• entertainment system.

Verdict: the best default choice when you want clear monitoring, estimated cost, compact hardware, and broad smart-home compatibility.

2. Emporia Smart Plug — Best for Serious Energy Tracking

Best for: roommates who genuinely want to analyze electricity use
Real-time watts: yes
Voltage: yes
Cumulative kWh: yes
Historical data: yes
Cloud reporting: every second while online
Subscription: none

Emporia approaches the smart plug as part of an energy-management platform rather than primarily as a remote-controlled outlet.

Its current documentation says the plug reports:

• real-time power;
• voltage;
• cumulative energy;

to the Emporia cloud every second while online.

Historical data can be viewed by:

• hour;
• day;
• month.

For shared-rental tracking, this is excellent.

Why the detail is useful

Imagine two roommates both have window fans.

One says:

“Mine only runs at night.”

Instead of guessing, Emporia can show the actual energy history.

This helps identify:

• long runtime;
• standby consumption;
• forgotten devices;
• differences between similar appliances.

Pairing with Emporia Vue

If the property owner already has an Emporia Vue circuit-level monitor, smart plugs can become part of a broader energy picture.

That is usually more relevant to homeowners than renters, but it shows why Emporia’s app is particularly energy-focused.

The load-rating caution

Emporia’s current U.S. shop specifications list:

• maximum power: 1,800W at 120V;
• maximum peak load: 15A for one hour per day;
• maximum continuous load: 10A.

That continuous figure matters.

Do not look only at “15A” and assume the plug is appropriate for any high-current appliance.

Emporia also warns against using its smart plugs with certain power-sensitive equipment.

Verdict: best when data quality and history are more important than ecosystem breadth.

3. Shelly Plug US Gen4 — Best for Local Control and Advanced Users

Best for: Home Assistant users, technically inclined roommates, local automations
Power measurement: yes
Maximum U.S. load: 15A / 1,800W
Matter: yes
Wi-Fi: yes
Zigbee: yes
Bluetooth: yes

Shelly is the smart plug I would choose for a shared rental where someone already runs a more advanced home-automation system.

The current Plug US Gen4 combines:

• energy measurement;
• Wi-Fi;
• Bluetooth;
• Zigbee;
• Matter;
• 15A / 1,800W rating;
• UL certification.

Shelly’s recent plug families also emphasize:

• local control;
• web interfaces;
• power and voltage information;
• automation rules;
• protection thresholds.

Why local-first control is useful in a rental

Cloud services can change.

Roommates can move.

Wi-Fi accounts get replaced.

A device that exposes more local control options is easier to integrate into:

• Home Assistant;
• local dashboards;
• custom household automation.

Good use case

A technical shared apartment could create a dashboard showing:

• Room A workstation today: 1.8 kWh
• Room B workstation today: 0.9 kWh
• shared TV setup: 0.6 kWh
• common coffee station: 0.2 kWh

That is much more transparent than trying to remember who used what.

The downside

Shelly offers more flexibility than many roommates actually need.

If nobody wants:

• local web interfaces;
• advanced automation;
• multiple radio protocols;

Tapo is easier.

Verdict: best for power users who value local integration and flexible automation.

4. Eve Energy — Best Privacy-First Smart Plug

Best for: roommates who want energy tracking without another vendor cloud account
Matter: yes
Thread: yes
Energy monitoring: yes
Projected energy cost: yes
Vendor cloud: no Eve cloud
Subscription: none

Eve Energy takes a different approach from Wi-Fi-first smart plugs.

It uses Matter and Thread and emphasizes privacy.

Eve explicitly states:

• no Eve cloud;
• no registration;
• no subscription.

That can matter in a shared home where nobody wants one roommate to become the administrator of yet another vendor cloud account.

Energy tracking

Through the Eve app and supported platforms, Eve Energy can track:

• power consumption;
• usage patterns;
• estimated cost.

You can enter your electricity rate for cost estimates.

Local schedules

Eve also supports schedules that can continue independently of the smartphone or internet connection when configured through a compatible hub.

That is useful for:

• lamps;
• fans;
• office accessories;
• predictable loads.

Shared-home ecosystem

Matter lets Eve Energy participate in multiple major smart-home platforms.

That reduces the problem of:

• one roommate using Apple;
• another using Android;
• someone else running Home Assistant.

Why it is not first overall

Eve’s privacy model is excellent, but Tapo and Emporia expose energy data in a more immediately energy-centric workflow for many users.

Verdict: the best choice when privacy, Thread, Matter, and reduced cloud dependence matter more than the absolute deepest monitoring interface.

5. Tapo P316M — Best for Shared Entertainment Centers

Best for: TVs, game consoles, speakers, streaming boxes, desks, shared electronics
Smart AC outlets: 6
Energy monitoring: per outlet
USB ports: 3
Matter: yes
Surge protection: yes
Individual outlet scheduling: yes

Sometimes six individual smart plugs are the wrong solution.

A shared living room may have:

• TV;
• game console;
• streaming box;
• soundbar;
• subwoofer;
• charger.

Tapo P316M puts six individually controlled smart AC outlets into one strip.

More importantly for this article, TP-Link says it can track each outlet’s energy use.

That makes it an excellent common-area tool.

Why per-outlet data matters

You can identify whether the shared entertainment system is using:

• 20 kWh/month for the TV;
• 9 kWh for the console;
• 3 kWh for audio;
• 2 kWh of standby devices.

Then you can decide whether the shared load is worth optimizing.

Surge protection

The strip also includes surge protection.

That is valuable when several expensive electronics live in one rental living-room setup.

Shared-load caveat

The P316M is still one physical strip.

Its total electrical rating applies to the whole assembly.

Do not assume each outlet can independently carry the strip’s full maximum load at the same time.

Verdict: the best solution for several shared devices in one location.

Kasa KP125M — Best Alternative for Existing Kasa Homes

Kasa KP125M deserves a mention because it closely overlaps Tapo P110M.

Current Kasa documentation supports:

• Matter;
• real-time energy monitoring;
• historical energy monitoring;
• electricity-rate input;
• bill estimates;
• compact design;
• 15A / 1,800W general-use U.S. rating.

If the household already uses Kasa:

• bulbs;
• switches;
• cameras;
• other plugs;

there is little reason to add a second app solely because Tapo ranks first here.

The best smart plug is often the one that fits the automation platform you already maintain.

Smart Plugs Are Not Utility Revenue Meters

This is the most important shared-rental caveat.

A consumer smart plug can produce useful electricity measurements.

That does not automatically make it equivalent to:

• the utility’s billing meter;
• a certified revenue submeter;
• a landlord-approved billing system.

NIST’s work on electricity metrology shows how strict accuracy requirements and standardized testing become when electrical measurements are used for fair utility billing.

Consumer smart-plug product pages generally market:

• monitoring;
• automation;
• cost estimation;

not regulated revenue metering.

What this means in practice

For roommates voluntarily sharing a bill, a smart plug can be excellent evidence.

For a landlord formally charging tenants by measured electricity consumption, use the metering method required by applicable lease terms, utility rules, and local law.

Do not assume a $20-$40 consumer plug creates a legally valid submetering system.

The Best Way to Split a Shared Electricity Bill

If everyone agrees to use smart-plug data, define the rules before the first month.

A workable system separates the bill into categories.

1. Fixed charges

Examples:

• monthly customer charge;
• meter fee;
• fixed utility service charge.

Split these evenly unless everyone agrees otherwise.

They usually exist even when nobody uses a monitored appliance.

2. Shared loads

Examples:

• refrigerator;
• Wi-Fi router;
• living-room TV;
• microwave;
• common lights.

Split them evenly or by an agreed household formula.

Do not waste time trying to assign refrigerator compressor cycles to individual roommates.

3. Personal plug loads

Examples:

• bedroom gaming PC;
• personal dehumidifier;
• dedicated workstation;
• mini fridge, if allowed;
• personal entertainment setup.

These are the loads smart plugs measure best.

4. Central unmonitored loads

Examples:

• central AC;
• electric water heater;
• built-in oven;
• electric range;
• hardwired lighting;
• laundry circuits.

A plug cannot see these.

If central HVAC dominates the bill, individual smart plugs will only explain a fraction of monthly usage.

A Fair Calculation Example

Suppose the utility bill is $180.

The bill shows:

• fixed charges: $20;
• variable energy-related charges: $160.

Three roommates agree that common and central loads should be shared equally.

Smart plugs recorded personal loads:

• Roommate A: 70 kWh
• Roommate B: 30 kWh
• Roommate C: 20 kWh

Total individually monitored:

70 + 30 + 20 = 120 kWh

Assume the household agrees on an effective energy rate of:

$0.20/kWh

Personal measured cost:

• A: $14
• B: $6
• C: $4

Total allocated to individual loads:

$24

The remaining shared bill:

$180 - $24 = $156

Shared three ways:

$156 ÷ 3 = $52

Final contribution:

• A: $52 + $14 = $66
• B: $52 + $6 = $58
• C: $52 + $4 = $56

Total:

$180

This is just one roommate agreement.

It is not the only fair method.

Why the App’s Cost Estimate May Not Match the Utility Bill

A smart plug may let you enter an electricity rate such as:

$0.18/kWh

But the utility bill can contain:

• customer charges;
• taxes;
• transmission charges;
• distribution charges;
• fuel adjustments;
• tiered prices;
• seasonal rates;
• time-of-use pricing.

Therefore:

smart plug estimated cost ≠ guaranteed utility billed cost

For fair roommate calculations, agree on the rate source.

Possible methods:

Simple method

Use the utility’s stated energy rate.

Better method

Use:

variable electricity charges ÷ billed kWh

This creates an approximate effective variable rate.

Time-of-use household

Use a plug/app that supports TOU cost estimation—or calculate peak and off-peak energy separately.

Tapo’s current energy-monitoring system supports time-based billing inputs in supported versions.

Label Everything

Naming is surprisingly important.

Bad device names:

• Plug 1
• Smart Plug
• Bedroom
• Outlet

Better names:

• Alex Gaming PC
• Maya Desk Setup
• Shared Living Room TV
• Shared Coffee Station

At the end of the month, nobody should need to remember which IP-connected outlet was behind which desk.

Physical labels help too

Put a small removable label on the plug:

A – Gaming PC

If roommates swap devices, update the app name immediately.

Bad data usually starts with bad labeling.

Decide Who Owns the Smart-Home Account

Shared rentals have a lifecycle problem.

One roommate may:

• move out;
• change the Wi-Fi password;
• delete the home;
• take the hub.

Avoid building billing visibility around one person’s private account without a transition plan.

Better setup

Use:

• a shared household email where appropriate;
• platform family sharing;
• Matter multi-admin;
• exported monthly records;
• clear device ownership.

Tapo’s Matter and family-sharing model is useful here because the smart plug does not need to live only inside one person’s voice-assistant ecosystem.

Export or Snapshot Monthly Usage

Do not rely on the app having the exact history you need forever.

At the billing date:

1. record each measured plug’s kWh;
2. save a screenshot or exported report if supported;
3. save the utility bill;
4. calculate the agreed allocation;
5. store the monthly summary in the roommate group folder.

This turns an argument into an audit trail.

The ideal record is simple:

Month	Device	kWh	Rate used	Assigned cost
July	Alex Gaming PC	62.4	$0.19	$11.86
July	Maya Workstation	31.8	$0.19	$6.04
July	Shared TV	12.1	shared	shared

No detective work later.

Do Not Track Every Tiny Device

Smart plugs themselves consume electricity.

They also cost money and require Wi-Fi connections.

It makes no sense to put one on a phone charger that uses a few dollars per year just to prove one roommate owes $0.17 more this month.

Prioritize:

• devices with long runtime;
• devices above roughly 50-100W during normal operation;
• equipment suspected of being a major contributor;
• loads one roommate uses exclusively.

The purpose is transparency, not electrical surveillance.

Good Devices to Monitor

Gaming PCs

One of the best candidates because power changes dramatically by activity.

Desktop workstations

Especially dual-monitor home offices used eight or more hours per day.

Dehumidifiers

Long runtime makes their monthly energy significant.

Entertainment setups

TVs, consoles, and audio equipment can accumulate meaningful use.

Fans

Useful for understanding seasonal room-specific cooling habits.

3D printers and hobby equipment

Usage can be intermittent but power-intensive.

Devices That Need Extra Caution

Portable air conditioners

These contain compressors and motors.

Do not use a smart plug unless the AC manufacturer and smart-plug manufacturer both permit the arrangement and all load ratings are appropriate.

Space heaters

Heating loads can operate near circuit limits for long periods.

Use only explicitly supported devices and follow manufacturer restrictions.

Refrigerators and freezers

Motor startup current and the consequences of accidental remote shutoff make these poor casual experiments.

Emporia’s own product material warns against power-sensitive equipment.

Medical equipment

Do not place essential medical devices behind a smart relay that can be switched off remotely or fail due to network/firmware issues.

Smart Plug Safety Ratings: Read More Than “15A”

Three specifications can all be different:

• maximum current;
• continuous current;
• motor load;
• resistive load.

Emporia is a perfect example.

Its current U.S. specification lists:

• 15A maximum peak for a limited duration;
• 10A continuous.

Tapo and Kasa product pages also distinguish general/resistive load from motor ratings.

A device drawing 12A continuously is not the same as a lamp that briefly peaks.

When in doubt, do not use the smart plug as the intermediary.

Can Smart Plugs Actually Reduce Electricity Use?

They can do more than measure.

DOE specifically recommends power strips and smart plugs for renters because appliances and electronics can consume electricity while plugged in, even when they are not actively being used.

The useful savings functions are:

Schedule

Turn a workstation accessory strip off overnight.

Auto-off

Shut down a device after it has been idle.

Usage threshold automation

Advanced platforms can act based on measured power.

Standby identification

Discover which equipment keeps drawing power all night.

Behavioral feedback

Seeing 70 kWh beside one device changes behavior faster than a generic “save energy” reminder.

The monitoring value is often psychological as much as technical.

Best Pick by Shared-Rental Scenario

Three roommates, different personal electronics

Tapo P110M

Why:

• easy;
• compact;
• cost estimates;
• broad smart-home support.

Energy-nerd household

Emporia Smart Plug

Why:

• deeper measurements;
• rapid cloud reporting;
• good historical data.

Home Assistant apartment

Shelly Plug US Gen4

Why:

• local-friendly architecture;
• Matter;
• Zigbee;
• Wi-Fi;
• advanced automation.

Privacy-conscious Apple/Android mix

Eve Energy

Why:

• Matter;
• Thread;
• no Eve cloud;
• no subscription.

Shared gaming / TV area

Tapo P316M

Why:

• six monitored outlets;
• one physical strip;
• per-device data;
• surge protection.

Shared-Rental Setup Checklist

Before using smart-plug data for money:

• Everyone agrees to the tracking method.
• Everyone knows which devices are monitored.
• Fixed utility charges have an agreed allocation rule.
• Shared appliances have an agreed rule.
• Personal devices are clearly labeled.
• The electricity rate source is defined.
• Time-of-use pricing is handled correctly if applicable.
• Smart plug load ratings match every connected appliance.
• Nobody can remotely shut off another person’s essential equipment.
• Monthly readings are saved.
• The method is treated as a roommate agreement, not automatically as revenue-grade submetering.
• The setup can be handed over when someone moves out.

Conclusion

Smart plugs cannot explain an entire apartment electricity bill, but they can solve the part that causes many roommate arguments: nobody knows how much the personal appliances actually use.

For most shared rentals, Tapo P110M is the best overall choice because its energy monitoring is easy to understand, it can estimate cost from your electricity rate, and Matter makes it easier to share across different smart-home ecosystems.

Choose Emporia when detailed data is the priority. Choose Shelly Plug US Gen4 when local control and advanced automation matter. Choose Eve Energy when privacy and Thread/Matter are more important than cloud analytics. Use Tapo P316M when several shared devices need to be measured separately in one entertainment or office area.

Most importantly, agree on the billing method before collecting the data.

A smart plug can measure kilowatt-hours. It cannot decide what your roommates consider fair.