How do I know if my tenant is crypto mining — and what can I do about it?
A crypto mining tenant in Malaysia creates three landlord risks at once: a TNB bill that may still be in your name, changes to the unit's wiring or ventilation, and a breach of the residential-use clause. The detection signs are clear; the protection is documentation and the right tenancy clauses.
SPEEDHOME landlord operations data (Q1 2026) shows TNB-bill disputes most often trace back to the handover window — the account was never transferred to the tenant, the meter reading was never recorded in writing, and a high-load appliance was running for weeks before anyone noticed. The TNB bill is the visible cost, but the unit is the bigger exposure: rigs run hot, draw continuous load, and sometimes require additional wiring or cooling that a tenant installs without consent. TNB bill liability, unit damage, and TA breach each have their own remedies — and they do not overlap.
What are the warning signs that a tenant is crypto mining?
The two most reliable signals are an unexplained spike in TNB consumption and heat or noise from the unit at unusual hours. Either one, documented, is the start of your evidence file.
Landlords who spot it early typically noticed one or more of these:
- TNB bill jump of 3x or more versus the same unit in a previous tenancy or the same month last year. Mining rigs run 24 hours a day, so the jump is sustained, not a one-off.
- Continuous low-frequency hum or fan noise from the unit, particularly at night. Multiple GPUs or ASIC miners produce a distinctive constant drone.
- Unusual heat from the unit detected at the front door or adjacent shared wall — rigs generate significant heat and require cooling, which tenants sometimes route through open windows or added fans.
- Requests to install additional air-conditioning units or wall penetrations shortly after move-in, without a clear residential reason.
- Burning smell or tripped circuit breakers reported by neighbours or building management, which can indicate overloaded circuits.
- High-draw equipment visible during a lawful inspection or delivery: rows of graphics cards, ASIC units, power distribution strips, or industrial cooling fans.
Documenting each signal with a date-stamped voice note is what later lets you recover the TNB bill through deposit or court, not the equipment itself.
What is my risk as a landlord if the TNB account is still in my name?
If the TNB account was never transferred to the tenant, the registered account holder — you — is the party TNB will pursue for unpaid bills, regardless of who actually ran the equipment. The provider chases the account, not the occupant.
This is the most common landlord mistake in this scenario. TNB's Change of Tenancy process exists precisely to shift that account responsibility. If you did not complete it before handover, and the tenant runs a mining rig for three months, you can be looking at a significant bill in your name that you then have to recover through the tenancy agreement and courts — not through TNB directly. On a typical 900 sqft condo with single-phase supply, a single ASIC already pushes past the per-circuit limit; a six-GPU rig is a separate electrical installation entirely.
The practical protection is to complete the Change of Tenancy (via the myTNB portal or nearest Kedai Tenaga) before or at the point of tenancy handover, and to record the meter reading in writing with the tenant present. See the TNB Change of Tenancy guide for the current document requirements.
Warning signs, risks, and landlord actions at a glance
The whole landlord job compresses to six rows — signal, what it suggests, and the one action that protects you.
| Signal | What it suggests | Landlord action |
|---|---|---|
| TNB bill 3x or more vs prior period | High continuous load — consistent with mining | Download bills; compare to baseline; note account-holder name |
| Constant low hum / fan noise, odd hours | Multiple rigs running 24/7 | Document with date-stamped voice note or neighbour statement |
| Request for extra aircon or wall penetration | Cooling need beyond residential use | Check TA clause on alterations; deny in writing if not permitted |
| Tripped circuit breakers / burning smell | Overloaded residential electrical circuit | Notify JMB/MC immediately; request inspection right in writing |
| Visible mining hardware during inspection | Commercial-scale operation in residential unit | Photograph; issue written notice citing residential-use and equipment clause |
| TNB account still in landlord's name | Landlord liable to provider for all unpaid bills | Complete Change of Tenancy via myTNB before next handover |
What can I actually do — and what must I not do?
Document the breach, issue a written notice, and escalate through the TA's remedy clauses and the courts. A landlord cannot lawfully evict by self-help — no lock changes, no removing the tenant's belongings, no cutting utilities.
This matters because the instinct in this situation is to act fast: disconnect the power supply, lock the tenant out of the unit, or seize the equipment. Each of those actions is unlawful under Malaysian law and hands the tenant a counter-claim that makes your legitimate recovery much harder.
The lawful steps:
- Secure the evidence first. TNB bills with account name, meter readings, photos of equipment, tenancy agreement, any written communications with the tenant.
- Issue a written notice citing the specific clauses breached (residential use, electrical alterations, nuisance, utility obligations) and give a cure period — typically 14 days for breach of the residential-use or electrical-alteration clause, mirroring the TA's stated cure window.
- Inspect the unit under your contractual inspection right — give proper notice and document what you find.
- Escalate to recovery. If the tenant does not cure the breach, the lawful route to recover possession is a written demand, then court action — a Writ of Possession and/or a Writ of Distress for rent arrears — enforced by the court bailiff (Specific Relief Act 1950 s.7(2); Distress Act 1951).
For the TNB bill specifically: if the account is under your name, contact TNB to flag the abnormal usage pattern and consider completing Change of Tenancy to limit further accrual. Recovery of the past bill from the tenant then goes through the deposit reconciliation and, if insufficient, the civil courts.
What to put in your tenancy agreement to prevent this
Six TA clauses drafted before signing prevent the most common crypto-mining disputes — residential-use, electrical-alteration, high-load equipment, utility-account responsibility, inspection right, and breach-remedy — and SPEEDHOME's managed TA ships with all six.
A well-drafted TA is the cheapest protection. These clauses, included before signing, block the most common mining-related disputes:
- Residential use only: the unit is for residential occupation and no commercial, industrial, or server/mining operation is permitted.
- Electrical alterations: no additional wiring, distribution boards, heavy-draw equipment, or modifications to the electrical installation without the landlord's prior written consent.
- High-load equipment: no equipment with individual load above a stated wattage (consult the building's electrical spec) may be installed or operated.
- Utility account responsibility: the tenant must maintain the TNB and water accounts in the tenant's own name and provide copies of current bills to the landlord on request.
- Inspection right: the landlord may inspect the unit on reasonable written notice (typically 24–48 hours) during normal hours.
- Breach remedy: breach of the residential-use or electrical-alteration clause entitles the landlord to terminate the tenancy and recover possession through the lawful process.
SPEEDHOME's managed tenancy agreements are drafted with these protections built in, including a standard 24-hour written-notice inspection clause and a residential-use clause that SPEEDHOME's operations team is set up to enforce end-to-end. If you are listing on SPEEDHOME, you also have the managed utility setup layer via SPEEDHOME that handles the TNB account transfer as part of tenancy onboarding — completing the Change of Tenancy before handover and removing the single biggest bill-liability exposure before it starts.
For more on managing utility bills in Malaysia across electricity, water, and internet, see the full utility guide.
FAQ
Can a landlord cut the electricity if a tenant is crypto mining illegally? No. Cutting utilities to pressure a tenant is unlawful self-help under the Specific Relief Act 1950 s.7(2), regardless of what the tenant is doing. Document the breach, issue notice, and use the tenancy agreement's remedy clauses and the courts.
Who pays the TNB bill if the tenant runs a mining rig without telling the landlord? If the TNB account is in the landlord's name, TNB pursues the account holder. The landlord can then recover the mining-related overconsumption from the tenant using bills, meter readings, and tenancy clauses — but that recovery goes through the deposit and civil courts, not through TNB directly.
What documents do I need to prove my tenant was crypto mining? Build a file: TNB bills showing the usage spike (with the account holder name), meter readings at move-in and at the time of discovery, photographs of equipment taken during a lawful inspection, the tenancy agreement clauses breached, and any written communications with the tenant.
Does crypto mining breach a standard Malaysian tenancy agreement? Yes — crypto mining in a residential unit breaches a standard Malaysian tenancy agreement under the residential-use clause and the electrical-alteration clause, both standard in well-drafted agreements, because rigs are commercial-grade equipment that alter the unit's electrical load beyond its design.
Can I end the tenancy early if I discover crypto mining? If the tenant has materially breached the tenancy agreement (residential use, electrical alterations, nuisance), you may have grounds to terminate early under the breach remedy clause. The termination must follow the agreement's notice and cure process; you cannot simply end it by removing the tenant or their belongings without going through the lawful process.