The verdict in three sentences
A mini-grid operator running 14 communities and 9,000 customers from its Miami headquarters, across Caribbean islands and rural Central America, cannot keep absorbing 18 % losses from arrears, illegal connections and tampered meters. A billing platform linked to connected prepaid meters, with mobile and card top-ups and consumption anomaly detection, costs, as a 2026 order of magnitude, 70,000 to 120,000 USD. The realistic target is to bring losses below 8 % within a 6-month project, which funds the software in about a year.
Where the 18 % goes
In a small island or rural grid, commercial losses have three sources: postpaid customers who do not pay, inaccurate manual meter reads and theft (meter bypass, a neighbour's tap). The operations director sees consolidated figures a month late and cannot tell which site is drifting.
| Loss source | Share of the 18 % | Main cause | Software response |
|---|---|---|---|
| Postpaid arrears | 8 points | Unpaid monthly bills, door-to-door collection | Switch to prepaid |
| Read errors | 3 points | Manual reads, late entry | Remote meter reading |
| Theft and bypass | 5 points | Shunts, illegal hook-ups | Feeder energy balance and alerts |
| Untracked technical losses | 2 points | Cables, transformers | Per-site dashboard |
Prepaid solves arrears by design: the customer buys kWh credit before using it. Remote reading and the energy balance (energy injected at the plant minus the sum of billed consumption) expose theft site by site.
Scope and market options
The platform has five building blocks: customer and meter register, tariff engine, top-ups by card, mobile wallet and local cash agents, meter data collection (cellular or RF mesh depending on coverage), dashboards and alerts. The meters are a separate hardware line, often 60 to 120 USD per communicating prepaid meter in this market.
| Option | Upfront cost (2026 order of magnitude) | Recurring cost | Timeline | Limitation |
|---|---|---|---|---|
| Specialised SaaS platform | 10,000 to 25,000 USD setup | 0.80 to 1.80 USD per customer per month | 2 to 3 months | Locked meter brands, weak local payment rails |
| Custom software | 70,000 to 120,000 USD | Hosting and maintenance quoted | 6 months | Upfront investment |
| Spreadsheet and manual reads | 0 USD | Meter readers, 18 % losses | None | No visibility |
| Module added to existing ERP | 40,000 to 80,000 USD | ERP licence | 4 to 6 months | Rarely fit for prepaid |
At 9,000 customers, a SaaS at 1.20 USD per customer per month costs 129,600 USD a year, with no data ownership and no freedom over meters. Custom becomes rational above about 5,000 customers or when new sites are planned.
Regulation and tariff design
Island and rural grids sit under very different regulators, from public utility commissions to energy ministries, and tariffs often have to be filed and approved. The tariff engine therefore supports lifeline blocks for low-consumption households, time-of-use rates for productive users and a regulated service fee per top-up. Every tariff change is versioned and dated, so the operator can show the regulator exactly which rate applied to which customer on which day. This audit trail also matters for donors and impact investors who fund many mini-grid portfolios.
Data ownership matters here too. Meter reads, payment histories and site energy balances become the evidence base for the next financing round, and investors increasingly ask for monthly loss reports per site. With a custom platform those reports are generated directly from the operator's own database, in the format the investor requests.
Mini case study
Carlos Rivera, operations director of a mini-grid operator in Miami, starts from average theoretical revenue of 18 USD per customer per month.
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- Theoretical annual revenue: 9,000 x 18 x 12 = 1,944,000 USD.
- Current losses at 18 %: 349,900 USD a year.
- Target losses at 8 %: 155,500 USD a year.
- Revenue recovered: 194,400 USD a year.
For a 100,000 USD platform, meters excluded, payback arrives about 6 months after go-live. Redeploying 4 meter readers and collectors to grid maintenance improves the numbers further.
FAQ
Are top-ups instant?
Yes, a card or mobile wallet payment sends a token or credit to the meter in under a minute. The customer gets an SMS confirmation with the kWh balance.
What about sites without reliable cellular coverage?
Meters can run on keypad tokens with no permanent link. Data is then collected through an RF gateway at the plant and synced one or more times a day.
How does the platform detect theft?
It compares energy sent out on each feeder with the sum of billed consumption and flags any gap above a threshold, for example 5 %. It also flags meters whose usage drops by more than 60 % overnight.
Can some customers stay postpaid?
Yes, for productive users such as ice plants or workshops, with monthly bills and remote disconnection after 15 days of arrears. Prepaid stays the default for households.
Does the 6-month timeline include meter rollout?
It covers the software and a 2-site pilot. Replacing 9,000 meters runs in parallel, at 300 to 500 installs a week with 3 crews.
Related reading: our piece on oilfield equipment certification tracking in Toronto and our custom web applications service.
Let's scope your project. We scope your billing platform from your sites, your meters and your payment channels, with a 2-site pilot then a 6-month rollout. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
