In Kamuli, a Shs394 billion high-tech cassava plant has spent roughly 18 months unable to reach full production because the grid cannot supply the more than 5 MW it needs. The operators report spending about UGX 15 million per shift on diesel generators, versus roughly UGX 2 million for the same energy from the grid — a diesel premium of around 7.5x. That single case is extreme, but the per-kWh gap behind it is the same one every Ugandan industrial and commercial buyer should model before committing to backup or primary power.
What the Kamuli case actually shows
The Kamuli situation is not an argument that diesel is always wrong. It is a demonstration of what happens when grid access is delayed and the only fallback is generator fuel. Most businesses are not spending UGX 15 million a day. But the unit economics are consistent across smaller operations: diesel generation in Uganda is commonly priced at UGX 1,200–2,500 per kWh, while ERA's Q1 2026 tariffs range from about UGX 203.6 per kWh for extra-large industrial users to UGX 546.4 per kWh for commercial users. When diesel is the alternative, the grid is not an expensive default; it is usually the cheapest available input.
What diesel generation actually costs per kWh
A generator's purchase price tells you almost nothing about its cost. The honest number is total cost per kWh over the life of the asset. East Africa comparisons have put Uganda diesel at around $0.97 per litre, a fuel-only cost of roughly $0.29 per kWh, and a full diesel levelised cost of energy around $0.35 per kWh. Local proposal models often use UGX 1,200–2,500 per kWh once maintenance, depreciation, load factor and the inefficiency of running a generator below its nameplate capacity are included. That is why the Kamuli figure — about UGX 15 million a day — is not an outlier of waste; it is what diesel arithmetic produces at multi-megawatt scale.
- Fuel price at the pump or delivered to site
- Generator efficiency and whether it runs close to rated load
- Maintenance, oil changes, overhauls and parts
- The cost of downtime and lost production during outages
- Capital cost spread over the generator's operating life
Grid power is your baseline, not the enemy
Use the grid tariff as the reference point. At Q1 2026 ERA prices, commercial users pay about UGX 546.4 per kWh; medium industrial about UGX 355.1; large industrial about UGX 300.4; and extra-large industrial about UGX 203.6. Those prices include generation, transmission and distribution, and they make diesel look like what it is: an expensive bridge. If you are waiting 18 months for a connection, that waiting period is a real cost item — not just the diesel, but the opportunity cost of delayed production. Treat grid connection delay as a project risk with a price tag, and run the arithmetic before you sign a generator or solar contract.
Commercial solar: the cost and realistic yield
Commercial solar in Uganda is now commonly estimated at around $1,200 per kWp installed, with some recent panel-and-installation pricing in the $0.55–0.85 per watt band. Battery storage is extra. A well-sited system in Uganda can yield roughly 1,450–1,534 kWh per kWp per year, so a 100 kWp array might produce around 145,000–153,400 kWh in its first year before degradation. Captive solar in Uganda has been modelled to run 20–30% below the grid tariff. That is the key comparison: solar is not free energy, but at those costs it can undercut both grid and diesel for daytime load.
If upfront capital is the blocker, the conversation has shifted. The Ministry of Energy is urging private-sector solar plus battery storage, using pay-as-you-go and power-consumption financing models to reduce the initial cheque, while cautioning against substandard equipment. We unpacked one structured Ugandan example in Zero-Upfront Solar in Uganda: The dfcu-Sawa Energy Deal Explained.
Battery storage: the part people misprice
Batteries do not produce power; they move it from sunny hours to evening hours or cover short outages. Commercial battery storage in Uganda is often modelled between $300 and $600 per kWh, with lithium prices falling around 19% year-on-year in 2023. If your only need is backup for a few hours, you may need far less storage than a salesperson proposes. If your goal is to avoid diesel entirely for evening operations, the battery becomes part of a generation-plus-storage cost per kWh — and that number, not the panel price, should drive the decision. For a method to size storage around actual load and outage duration, see our battery sizing guide for Ugandan businesses.
A defensible TCO framework
You do not need to become a procurement expert, but you do need a method. The objective is to compare three options — grid, diesel, and solar with or without storage — on the same total-cost-per-kWh basis over the life of the asset. Here is the sequence we use with clients.
- Establish your actual load curve: peak kW, average kW, operating hours per day, weekday vs weekend.
- Calculate your current diesel cost per kWh from real fuel and maintenance logs, not generator nameplate.
- Compare against the relevant ERA grid tariff, including connection costs, availability and any planned expansion.
- Model solar plus storage scenarios using quoted installed costs, a Ugandan yield of roughly 1,450–1,534 kWh/kWp/year, and over the expected life of the system.
- Stress-test the result: what happens if grid is available 90% of the time instead of 60%, or if fuel prices rise 20%?
- Require warranties, performance guarantees and certified components before accepting any proposal.
Start with cost per kWh, not kW price
The number that matters is all-in cost per kilowatt-hour over the life of the asset. A low quoted price per kW is irrelevant if the system underperforms, if batteries need early replacement, or if maintenance is not priced.
When solar actually pays back
There is no honest single payback period because payback depends on your tariff class, load profile, financing cost and how often you would otherwise run diesel. The shape of the answer, however, is clear. Solar makes the strongest case when daytime load is high, diesel is currently covering a meaningful share of energy, and grid power is unavailable, unreliable or priced near the commercial tariff. If your operation runs mostly at night, or if you already enjoy cheap reliable large-industrial power, solar alone may not beat grid; solar plus storage may still beat diesel, but with a longer payback and more complexity.
Policy and market structure also affect the decision. Uganda's regulatory framework still imposes ceiling constraints that shape how larger captive and IPP projects are designed, financed and connected; we explain the implications in Uganda's 200 MW Solar Ceiling: What It Means for Your Energy Buy. The recent switch-on of a 24 MWp solar IPP in West Nile is a signal that utility-scale solar is arriving, but it does not change your project-level arithmetic.