How to bill tenants fairly for energy
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Short answer
A fair tenant energy bill has two parts. The tenant’s own consumption is measured with a sub-meter, and common area consumption is shared among tenants with a written allocation key. A written rule, applied the same way every month, with the basis of each calculation shown to the tenant, reduces disputes.
A fair bill has two parts
In a multi-tenant building the energy bill comes to the building. The tenant’s share has two parts:
- The tenant’s own consumption: energy used on the lines that supply the tenant’s space.
- The common area share: the tenant’s share of systems that belong to no single tenant, such as lobby, corridor and car park lighting, lifts, central heating and cooling, and pumps.
Tenants dispute bills most when they cannot see which of the two parts went up, and why.
1. Meter the tenant’s own consumption
The most reliable way to measure a tenant’s consumption is a sub-meter on the tenant’s own line. Without one, consumption is estimated from floor area or installed capacity, which does not reflect how the tenant actually uses energy.
Check:
- Is each tenant space metered separately? If one meter supplies more than one tenant, is that clearly recorded?
- Do readings arrive regularly? Are periods with missing readings marked?
2. Find common area consumption
Common area meters. The panels that supply common areas are metered separately and consumption is read directly.
Difference method. The sum of tenant sub-meters is subtracted from the main meter; the remainder counts as common area. It is easy to set up, but any unmetered consumption and distribution losses also end up in the common area. If a tenant meter has missing data, the common area looks larger than it is.
Check data quality before allocating: missing readings and offline or replaced meters change the result directly.
3. Choose an allocation key
An allocation key sets the measure used to share common area consumption among tenants.
| Key | How it is calculated | When it suits | Watch out |
|---|---|---|---|
| By floor area | Tenant area / total lettable area | Tenants with similar usage | Does not separate heavy users |
| By consumption | Tenant metered consumption / total tenant consumption | Buildings with reliable sub-meters | Missing data skews the result |
| Equal share | Total / number of tenants | A few similar tenants | Does not separate large and small tenants |
| Mixed | Fixed part by area, variable part by consumption | Tenants of different size and use | The rule must be written out clearly |
| By service | A system’s consumption only to those it serves | Car park, or a lift serving certain floors | You need to know which system serves whom |
Worked example
Say common area consumption in a month is 10,000 kWh. The building has 2,000 m² of lettable area and tenant A occupies 400 m². Allocated by floor area, tenant A’s common area share is 10,000 × 400 / 2,000 = 2,000 kWh. If tenant A’s sub-meter read 3,500 kWh in the same month, the total consumption to bill is 5,500 kWh. These figures only illustrate the method.
Where should the rule be written?
Disputes fall when the allocation rule is stated clearly in the lease or in a written agreement with building management. The rule should cover how tenant consumption is metered, how the common area is found, which key is used, who carries the share of vacant space, and what happens when data is missing.
In Turkish shopping centres the key is set by regulation. Under the Regulation on Shopping Centres (in Turkish), electricity, water and gas for common areas count as shared costs. Shared costs are allocated in proportion to each retailer’s sales area over the centre’s total sales area, and the owner carries the share of units that are not let (Article 11). Centre management prepares a yearly shared income and cost report that includes a meter layout plan showing the shared-cost meters by number, and the allocation is reviewed by an independent audit firm. The other keys in the table above apply to buildings other than shopping centres. This article is not legal advice; consult a lawyer about your lease.
To reduce disputes
- Apply the method the same way every month and announce changes in advance.
- Show each tenant the basis of the calculation: their own meter reading, the common area total, the key used and their share.
- Mark periods with missing data and say when an estimate was used.
- Make sure each tenant sees only their own data.
Frequently asked questions
How is a tenant’s own consumption measured?
A sub-meter is installed on the line that supplies the tenant’s space. Without one, consumption can only be estimated with a key, which raises the risk of disputes.
Why can the difference method overstate the common area?
The difference method subtracts tenant meters from the main meter. Any unmetered consumption, distribution losses and missing data from a tenant meter also end up in the common area.
Which allocation key is the fairest?
There is no single right answer. Floor area suits tenants with similar usage, metered consumption suits buildings with reliable sub-meters, and a mixed key suits different tenants. What matters is that the rule is written down and applied consistently.
What happens to the share of vacant space?
One option is to leave the share of vacant space with the owner. The allocation rule should state clearly which approach applies.
Are there separate rules for shared costs in Turkish shopping centres?
Yes. Under Türkiye’s Regulation on Shopping Centres, shared costs, including common area electricity, are allocated in proportion to each retailer’s sales area over the centre’s total sales area. The owner carries the share of units that are not let.
Sources
How you do this in GenieBlocks
In GenieBlocks, tenants, their offices and their consumption shares are kept in one place. Common area consumption is allocated to tenants and tenant bills are prepared from the same data. A tenant sees their own office’s consumption and not other tenants’.
How the platform helps
- TenantsTenants, their offices and consumption shares.
- Tenant BillingEnergy invoices issued to tenants.
- Common Area AllocationAllocating common area consumption to tenants.
- My OfficeTenants see their own office's consumption and comfort, and no one else's.
Related solution: Commercial buildings, malls and office towers