Imo State

Rooftop solar in Onuimo, Imo: what the roofs are worth

Onuimo has 14,703 buildings with a viable rooftop and 354 MWp of roof capacity. 40% run a generator, and together they spend ₦21bn a year on energy.

Viable buildings

14,703

Usable roof area

1.57 km²

354 MWp roof capacity

Energy spend

₦21bn/yr

20.4 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Onuimo

Approach B

Cash saved

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

Current energy spend₦21bn/yr

Year-one cash saved₦19.5bn

Lifetime cash saved₦1.02tn

NPV₦160bn

Median IRR25%

Median payback4.4 yr

Unlocked energy15.6 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity82.1 MWp

Capex₦83.2bn

Year-one energy value₦76.3bn

Lifetime energy value₦3.61tn

NPV₦612bn

Median IRR99%

Median payback1.1 yr

Three ways to size Onuimo'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: 82.1 MWp
Capital cost: ₦83.2bn
Year 1 savings: ₦76.3bn/yr
NPV: ₦612bn
Median IRR: 99%
Median payback: 1.1 yr

The odds a rooftop in Onuimo pays back quickly

Of the 14,686 buildings in Onuimo with a modelled payback, 82.8% pay back inside five years and 39.9% inside three.

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How much of Onuimo's demand actually gets met

Buildings in Onuimo consume 28.7 GWh/yr but want 44.2 GWh/yr. The 35% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Onuimo

Loading band economics…

How many rooftops in Onuimo 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 14,686 buildings with a modelled result out of 14,703 in Onuimo. 13,068 clear a positive NPV.

Payback

Under 3 years5,859 (40%)

Under 5 years12,160 (83%)

Under 7 years13,061 (89%)

Under 10 years13,573 (92%)

Return (IRR)

Above 10%13,412 (91%)

Above 15%13,068 (89%)

Above 20%12,458 (85%)

Above 25%8,549 (58%)

CO₂ avoided

34.9 kt/yr

Fuel avoided

10.3 million litres/yr

Energy unlocked

15.6 GWh/yr

Demand that is suppressed today

People served

222k

What hardware costs right now

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

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 Onuimo

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	6,742	3,064	₦13.8bn	₦12.5bn	25%	4.4 yr
E	4,562	1,686	₦4.58bn	₦4.54bn	25%	4.4 yr
C	2,090	819	₦1.98bn	₦1.91bn	25%	4.4 yr
B	1,309	277	₦605m	₦605m	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	13,327	4,606	₦15.5bn	₦14bn	25%	4.4 yr
Commercial General	775	707	₦4.31bn	₦4.31bn	65%	1.6 yr
Commercial Retail	392	360	₦196m	₦196m	63%	1.6 yr
Anchor	135	114	₦816m	₦777m	73%	1.4 yr
Industrial	39	28	₦120m	₦120m	69%	1.6 yr
Worship	34	30	₦76.2m	₦76.2m	59%	1.9 yr
Filling Station	1	1	₦6.58m	₦6.58m	69%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	6,146	2,297	₦9.03bn	₦9.02bn	25%	4.4 yr
50 100m2	3,607	1,415	₦2.45bn	₦1.66bn	25%	4.4 yr
Under 30m2	1,798	778	₦134m	₦134m	17%	6.4 yr
30 50m2	1,630	676	₦264m	₦252m	23%	4.9 yr
250 1000m2	1,504	665	₦7.89bn	₦7.27bn	25%	4.1 yr
Over 1000m2	18	15	₦1.23bn	₦1.19bn	77%	1.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	11,299	4,256	₦16.2bn	₦15.9bn	25%	4.4 yr
Urban Centre	1,783	956	₦1.34bn	₦1.34bn	51%	2.1 yr
Unclassified	1,462	520	₦3.3bn	₦2.1bn	25%	4.4 yr
Dense Urban	159	114	₦209m	₦209m	71%	1.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	5,609	1,914	₦12.7bn	₦12bn	25%	4.4 yr
Residential Small	5,268	1,801	₦2.7bn	₦1.9bn	25%	4.4 yr
Shed	2,441	885	₦87.4m	₦87.4m	11%	9.4 yr
Commercial Corridor	630	587	₦3.6bn	₦3.6bn	65%	1.6 yr
Kiosk Shop	392	360	₦196m	₦196m	63%	1.6 yr
Institutional	109	90	₦446m	₦408m	57%	1.9 yr
Educational Facility	47	40	₦228m	₦228m	81%	1.4 yr
Commercial	45	36	₦449m	₦449m	69%	1.6 yr
School	39	33	₦145m	₦145m	81%	1.4 yr
Industrial Site	26	20	₦86.8m	₦86.8m	69%	1.4 yr
Healthcare Facility	22	17	₦194m	₦194m	51%	2.1 yr
Clinic	16	14	₦73.6m	₦73.6m	49%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	14,703	5,846	₦21bn	₦19.5bn

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	13,853	5,080	₦16bn	₦14.6bn	25%	4.4 yr
SME High	676	624	₦4.06bn	₦4.06bn	65%	1.6 yr
Enterprise	174	142	₦936m	₦897m	69%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	9,200	3,489	₦16.2bn	₦15bn
0.0	2,444	885	₦89.6m	₦89.6m
2.0	2,181	758	₦1.4bn	₦1.05bn
1.0	605	452	₦275m	₦274m
4.0	267	256	₦2.6bn	₦2.6bn
5.0	6	6	₦495m	₦495m