Imo State

Rooftop solar in Isiala Mbano, Imo: what the roofs are worth

Isiala Mbano has 57,176 buildings with a viable rooftop and 1.35 GWp of roof capacity. 51% run a generator, and together they spend ₦35.8bn a year on energy.

Viable buildings

57,176

Usable roof area

6.01 km²

1.35 GWp roof capacity

Energy spend

₦35.8bn/yr

34.6 GWh/yr burned on generators

Median payback

2.4 yr

Median IRR 43% (cash saved)

The savings bracket for Isiala Mbano

Approach B

Cash saved

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

Current energy spend₦35.8bn/yr

Year-one cash saved₦35.5bn

Lifetime cash saved₦1.84tn

NPV₦291bn

Median IRR43%

Median payback2.4 yr

Unlocked energy31.9 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity139 MWp

Capex₦140bn

Year-one energy value₦121bn

Lifetime energy value₦5.75tn

NPV₦964bn

Median IRR99%

Median payback1.1 yr

Three ways to size Isiala Mbano'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: 139 MWp
Capital cost: ₦140bn
Year 1 savings: ₦121bn/yr
NPV: ₦964bn
Median IRR: 99%
Median payback: 1.1 yr

The odds a rooftop in Isiala Mbano pays back quickly

Of the 57,044 buildings in Isiala Mbano with a modelled payback, 75.0% pay back inside five years and 50.8% inside three.

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How much of Isiala Mbano's demand actually gets met

Buildings in Isiala Mbano consume 50.3 GWh/yr but want 82.3 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 Isiala Mbano

Loading band economics…

How many rooftops in Isiala Mbano 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 57,044 buildings with a modelled result out of 57,176 in Isiala Mbano. 49,376 clear a positive NPV.

Payback

Under 3 years28,988 (51%)

Under 5 years42,775 (75%)

Under 7 years49,324 (86%)

Under 10 years52,839 (93%)

Return (IRR)

Above 10%52,023 (91%)

Above 15%49,376 (86%)

Above 20%44,768 (78%)

Above 25%31,515 (55%)

CO₂ avoided

65.2 kt/yr

Fuel avoided

18.8 million litres/yr

Energy unlocked

31.9 GWh/yr

Demand that is suppressed today

People served

259k

What hardware costs right now

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

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 Isiala Mbano

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
C	19,581	9,614	₦10.6bn	₦10.6bn	25%	4.4 yr
E	19,088	9,329	₦11.1bn	₦11.1bn	25%	4.4 yr
D	18,166	9,790	₦13.4bn	₦13.1bn	61%	1.6 yr
B	341	335	₦698m	₦698m	59%	1.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	54,526	26,638	₦25.5bn	₦25.5bn	25%	4.4 yr
Commercial General	1,327	1,200	₦4.88bn	₦4.88bn	59%	1.9 yr
Anchor	510	479	₦4.27bn	₦3.99bn	63%	1.6 yr
Commercial Retail	450	423	₦113m	₦113m	59%	1.9 yr
Worship	188	171	₦450m	₦450m	61%	1.6 yr
Industrial	161	143	₦575m	₦575m	65%	1.6 yr
Filling Station	14	14	₦19.2m	₦19.2m	65%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	23,158	11,563	₦15.4bn	₦15.3bn	33%	3.1 yr
50 100m2	12,964	6,532	₦2.43bn	₦2.42bn	39%	2.6 yr
Under 30m2	8,234	4,202	₦400m	₦397m	37%	2.6 yr
30 50m2	6,878	3,487	₦569m	₦569m	41%	2.6 yr
250 1000m2	5,898	3,247	₦15.3bn	₦15.1bn	51%	2.1 yr
Over 1000m2	44	37	₦1.7bn	₦1.7bn	71%	1.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	53,322	27,351	₦33.9bn	₦33.6bn	45%	2.4 yr
Unclassified	2,632	1,195	₦1.19bn	₦1.18bn	25%	4.4 yr
Urban	1,222	522	₦724m	₦724m	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	21,499	10,620	₦21.4bn	₦21.3bn	25%	4.4 yr
Residential Small	21,414	10,818	₦3.54bn	₦3.53bn	45%	2.4 yr
Shed	10,216	4,770	₦422m	₦422m	17%	6.4 yr
Residential Informal	1,382	416	₦152m	₦152m	25%	4.4 yr
Commercial Corridor	735	645	₦2.22bn	₦2.22bn	61%	1.6 yr
Kiosk Shop	450	423	₦113m	₦113m	59%	1.9 yr
Institutional	405	376	₦2.2bn	₦2.2bn	57%	1.9 yr
Commercial	286	269	₦1.55bn	₦1.55bn	57%	1.9 yr
Educational Facility	149	143	₦737m	₦737m	81%	1.4 yr
School	129	122	₦320m	₦320m	81%	1.4 yr
Industrial Site	83	75	₦378m	₦378m	71%	1.4 yr
Healthcare Facility	70	63	₦863m	₦856m	53%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	57,176	29,068	₦35.8bn	₦35.5bn

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	55,470	27,518	₦27.1bn	₦27.1bn	25%	4.4 yr
SME High	1,035	928	₦3.79bn	₦3.79bn	61%	1.6 yr
Enterprise	671	622	₦4.84bn	₦4.57bn	65%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	36,391	18,770	₦30.1bn	₦29.8bn
0.0	10,229	4,783	₦427m	₦427m
2.0	7,996	3,942	₦1.42bn	₦1.41bn
4.0	1,462	714	₦2.75bn	₦2.75bn
1.0	907	669	₦157m	₦156m
5.0	165	165	₦743m	₦743m
6.0	26	25	₦220m	₦220m