Enugu State

Rooftop solar in Isi-Uzo, Enugu: what the roofs are worth

Isi-Uzo has 50,256 buildings with a viable rooftop and 775 MWp of roof capacity. 11% run a generator, and together they spend ₦11.9bn a year on energy.

Viable buildings

50,256

Usable roof area

3.47 km²

775 MWp roof capacity

Energy spend

₦11.9bn/yr

10.9 GWh/yr burned on generators

Median payback

5.6 yr

Median IRR 19% (cash saved)

The savings bracket for Isi-Uzo

Approach B

Cash saved

What these buildings stop paying — merit order, capped at current spend.

Current energy spend₦11.9bn/yr

Year-one cash saved₦11.6bn

Lifetime cash saved₦613bn

NPV₦94bn

Median IRR19%

Median payback5.6 yr

Unlocked energy12 GWh/yr

Approach A

Energy value (upper bracket)

What the energy is worth if full latent demand were met. Not cash saved.

Installed capacity76 MWp

Capex₦79.1bn

Year-one energy value₦73.7bn

Lifetime energy value₦3.51tn

NPV₦595bn

Median IRR101%

Median payback1.1 yr

Three ways to size Isi-Uzo's rooftops

Solar + battery. The default headline scenario, and the one the SEO fact base quotes. Prices the energy a full solar+storage system would deliver.

Baseline: mixed

Counterfactual: grid when available, generator otherwise, weighted by the NTL-derived grid availability. The realistic case, and what the headline numbers use. Always falls between grid and genset by construction.

Read with care: Sized to LATENT demand — the energy the building would use if it could. Against a cash baseline that only reflects today's spend this looks oversized; that is what sc3 exists to fix.

System size: 76 MWp
Capital cost: ₦79.1bn
Year 1 savings: ₦73.7bn/yr
NPV: ₦595bn
Median IRR: 101%
Median payback: 1.1 yr

The odds a rooftop in Isi-Uzo pays back quickly

Of the 49,317 buildings in Isi-Uzo with a modelled payback, 43.6% pay back inside five years and 11.2% inside three.

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How much of Isi-Uzo's demand actually gets met

Buildings in Isi-Uzo consume 18.5 GWh/yr but want 30.5 GWh/yr. The 39% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Isi-Uzo

Loading band economics…

How many rooftops in Isi-Uzo actually pay

Counted building by building on the cash-saved basis (merit-order sized, valued against what the building spends today), not read off an average. Shares are of the 49,317 buildings with a modelled result out of 50,256 in Isi-Uzo. 28,098 clear a positive NPV.

Payback

Under 3 years5,529 (11%)

Under 5 years21,492 (44%)

Under 7 years28,060 (57%)

Under 10 years32,876 (67%)

Return (IRR)

Above 10%31,837 (63%)

Above 15%28,098 (56%)

Above 20%23,565 (47%)

Above 25%17,149 (34%)

CO₂ avoided

22.3 kt/yr

Fuel avoided

5.81 million litres/yr

Energy unlocked

12 GWh/yr

Demand that is suppressed today

People served

257k

What hardware costs right now

Median advertised rates from our Nigerian market tracker — the same prices used to cost a system in Isi-Uzo.

Solar panels

₦250

₦/W

Inverters

₦127,419

₦/kVA

Batteries

₦177,500

₦/kWh

Full price tracker Size a home system Size a business system

Building mix in Isi-Uzo

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	20,901	2,083	₦4.65bn	₦4.65bn	17%	6.1 yr
E	17,094	2,208	₦4.91bn	₦4.88bn	19%	5.9 yr
C	12,261	1,347	₦2.34bn	₦2.02bn	21%	5.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	48,938	4,666	₦8.84bn	₦8.48bn	17%	5.9 yr
Commercial General	540	403	₦901m	₦901m	53%	1.9 yr
Industrial	360	234	₦459m	₦459m	63%	1.6 yr
Anchor	341	269	₦1.67bn	₦1.67bn	59%	1.9 yr
Worship	41	35	₦35.7m	₦35.7m	57%	1.9 yr
Commercial Retail	33	28	₦2.88m	₦2.88m	35%	3.1 yr
Filling Station	3	3	₦5.7m	₦5.7m	63%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
50 100m2	14,055	1,228	₦913m	₦894m	21%	5.1 yr
Under 30m2	12,121	1,071	₦151m	₦150m	5%	16.6 yr
100 250m2	11,483	1,777	₦3.9bn	₦3.9bn	25%	4.1 yr
30 50m2	10,225	818	₦274m	₦252m	9%	13.4 yr
250 1000m2	2,343	723	₦5.79bn	₦5.47bn	27%	4.1 yr
Over 1000m2	29	21	₦882m	₦882m	63%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	16,682	2,230	₦4.37bn	₦4.37bn	21%	5.4 yr
Unclassified	15,060	881	₦3.74bn	₦3.39bn	11%	8.4 yr
Dense Urban	13,744	1,805	₦2.28bn	₦2.28bn	19%	5.6 yr
Rural	4,770	722	₦1.51bn	₦1.5bn	19%	5.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	18,094	1,598	₦1.04bn	₦1.01bn	21%	5.1 yr
Shed	15,950	886	₦110m	₦110m	5%	15.9 yr
Residential	10,703	1,661	₦7.41bn	₦7.07bn	25%	4.1 yr
Residential Formal	4,035	508	₦279m	₦279m	23%	4.6 yr
Institutional	488	355	₦1.3bn	₦1.3bn	53%	1.9 yr
Industrial Site	349	230	₦454m	₦454m	65%	1.6 yr
Agricultural	152	13	₦5.05m	₦5.05m	17%	6.4 yr
Educational Facility	140	115	₦461m	₦461m	83%	1.4 yr
School	72	53	₦120m	₦120m	77%	1.4 yr
Healthcare Facility	60	46	₦368m	₦368m	49%	2.1 yr
Clinic	40	30	₦173m	₦173m	47%	2.4 yr
Commercial Corridor	39	38	₦24.6m	₦24.6m	35%	3.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	50,256	5,638	₦11.9bn	₦11.6bn

Not published for this cube: Median IRR, Median payback.

Lead segment

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Standard	49,510	5,089	₦9.7bn	₦9.33bn	17%	5.9 yr
Enterprise	696	501	₦2.12bn	₦2.12bn	63%	1.6 yr
SME High	50	48	₦101m	₦101m	37%	2.9 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	16,100	897	₦114m	₦114m
2.0	13,566	1,665	₦1.9bn	₦1.9bn
3.0	9,878	2,058	₦9.07bn	₦8.75bn
1.0	7,545	589	₦416m	₦375m
4.0	3,167	429	₦411m	₦411m