Sample Hotel Ltd, Naivasha
12 of 12 monthly electricity bills read, plus diesel records. Prepared 18 October 2026.
1. What your bills show
The hotel bought 216,000 kWh from the grid over 12 months, about KES 5.4M at KES 25 per kWh, and burned about 14,000 litres of diesel, about KES 2.9M at KES 210 per litre. Use peaks in March and April and in October and November.
Grid use, thousand kWh per month.
2. The system we suggest
A 120 kWp rooftop system covers about 64% of the grid power the hotel buys today. A 100 kWh battery shifts solar into the evening and cuts generator use by about a third. For a factory or a battery-heavy design, a 7-day load log before final sizing is recommended.
| Case | What it assumes | Yearly savings | Payback |
|---|---|---|---|
| Cautious | Savings 20% below base (lower output, tariff cuts) | KES 3.6M | 4.3 years |
| Base | The assumptions listed in section 5 | KES 4.5M | 3.4 years |
| Optimistic | Savings 15% above base (tariff rises, more diesel saved) | KES 5.2M | 3.0 years |
3. What it should cost, and the quotes you received
Our independent estimate is KES 15.5M, with a fair range of KES 14.0M to 17.0M. All three quotes fall inside the range.
| Installer | Quote before site visit | After site visit | Against estimate | Warranties (panels / workmanship) | Included | Licence |
|---|---|---|---|---|---|---|
| Sample installer A | KES 15.3M | No change | 1% below | 10 / 5 years | Everything, including roof works | Checked |
| Sample installer B | KES 15.9M | KES 16.4M (+3%) Longer cable run to main board | 6% above | 12 / 7 years | Everything, including roof works | Checked |
| Sample installer C | KES 14.1M | No change | 9% below | 10 / 2 years | Excludes roof strengthening | Checked |
Installer C is cheapest but excludes roof strengthening and offers the shortest workmanship warranty. Ask C to price the roof works before comparing. Joulio does not rank quotes; the choice is yours.
4. If you want financing
Example only, not an offer. A loan for 70% of the cost (KES 10.8M) over 5 years at 16% costs about KES 3.3M a year. Base-case savings cover that about 1.4 times; the cautious case about 1.1 times.
With your consent, Joulio can send this report and your bills to a licensed bank as an application package.
Impact, if installed
- About 4,900 litres of diesel saved a year
- About 13 tonnes of CO2 avoided a year from diesel alone
- About 139,000 kWh of grid power replaced a year
Kenya's grid is mostly renewable, so most of the climate benefit here comes from replacing diesel. Joulio counts impact only once a system is installed.
5. Every assumption
| Grid tariff | KES 25 per kWh |
| Diesel price | KES 210 per litre |
| Solar yield | 1,450 kWh per kWp per year |
| Share of solar output used on site | 80% |
| Diesel use cut by the battery | 35% |
| Installed cost | $0.75 per watt solar; $300 per kWh battery |
| Exchange rate | KES 129 per dollar |
| Diesel emissions | About 2.7 kg CO2 per litre |
6. Next steps
- Choose up to two installers for a site visit.
- Ask for revised quotes through Joulio, with a reason for any change.
- Tell us if you want a financing package sent to a bank.
This report is an indicative estimate to support your decision. It is not an engineering design, a sign-off or financial advice. The installer you choose is responsible for the site survey, final design and installation. Joulio does not sell or install systems, and installer fees never affect how quotes are shown.