Imo State

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

Ehime-Mbano has 59,753 buildings with a viable rooftop and 1.34 GWp of roof capacity. 43% run a generator, and together they spend ₦26.9bn a year on energy.

Viable buildings

59,753

Usable roof area

5.97 km²

1.34 GWp roof capacity

Energy spend

₦26.9bn/yr

25.9 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Ehime-Mbano

Approach B

Cash saved

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

Current energy spend₦26.9bn/yr

Year-one cash saved₦26.9bn

Lifetime cash saved₦1.38tn

NPV₦218bn

Median IRR25%

Median payback4.4 yr

Unlocked energy23.8 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity114 MWp

Capex₦117bn

Year-one energy value₦103bn

Lifetime energy value₦4.89tn

NPV₦822bn

Median IRR97%

Median payback1.1 yr

Three ways to size Ehime-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: 114 MWp
Capital cost: ₦117bn
Year 1 savings: ₦103bn/yr
NPV: ₦822bn
Median IRR: 97%
Median payback: 1.1 yr

The odds a rooftop in Ehime-Mbano pays back quickly

Of the 59,413 buildings in Ehime-Mbano with a modelled payback, 68.5% pay back inside five years and 43.5% inside three.

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How much of Ehime-Mbano's demand actually gets met

Buildings in Ehime-Mbano consume 37.3 GWh/yr but want 61 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 Ehime-Mbano

Loading band economics…

How many rooftops in Ehime-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 59,413 buildings with a modelled result out of 59,753 in Ehime-Mbano. 48,688 clear a positive NPV.

Payback

Under 3 years25,863 (44%)

Under 5 years40,722 (69%)

Under 7 years48,627 (82%)

Under 10 years53,083 (89%)

Return (IRR)

Above 10%52,078 (87%)

Above 15%48,688 (81%)

Above 20%43,030 (72%)

Above 25%27,989 (47%)

CO₂ avoided

49.3 kt/yr

Fuel avoided

14.3 million litres/yr

Energy unlocked

23.8 GWh/yr

Demand that is suppressed today

People served

251k

What hardware costs right now

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

Solar panels

₦250

₦/W

Inverters

₦127,419

₦/kVA

Batteries

₦177,500

₦/kWh

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Building mix in Ehime-Mbano

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	22,622	9,206	₦10.7bn	₦10.6bn	25%	4.4 yr
E	19,700	9,131	₦10.8bn	₦10.8bn	25%	4.4 yr
C	16,192	6,615	₦4.94bn	₦4.94bn	25%	4.4 yr
B	1,239	963	₦478m	₦478m	49%	2.1 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	58,134	24,434	₦19.8bn	₦19.8bn	25%	4.4 yr
Commercial General	736	688	₦3.29bn	₦3.29bn	59%	1.9 yr
Anchor	440	386	₦3.16bn	₦3.15bn	77%	1.4 yr
Worship	208	182	₦421m	₦421m	61%	1.6 yr
Commercial Retail	181	178	₦30.9m	₦30.9m	47%	2.4 yr
Industrial	45	39	₦153m	₦153m	71%	1.4 yr
Filling Station	7	6	₦10.4m	₦10.4m	51%	2.1 yr
Hospitality	2	2	₦13.9m	₦13.9m	51%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	22,397	9,602	₦11.4bn	₦11.4bn	25%	4.4 yr
50 100m2	13,753	5,745	₦1.82bn	₦1.82bn	23%	4.6 yr
Under 30m2	10,197	4,429	₦368m	₦367m	9%	7.9 yr
30 50m2	7,495	3,247	₦451m	₦451m	19%	5.9 yr
250 1000m2	5,859	2,854	₦10.9bn	₦10.9bn	25%	4.4 yr
Over 1000m2	52	38	₦1.97bn	₦1.96bn	73%	1.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	44,712	19,369	₦17.3bn	₦17.3bn	25%	4.4 yr
Urban	13,036	5,896	₦8.9bn	₦8.87bn	25%	4.4 yr
Unclassified	1,971	650	₦758m	₦758m	25%	4.4 yr
Rural	34	0	₦1.56m	₦1.56m	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	21,937	9,593	₦2.72bn	₦2.72bn	25%	4.4 yr
Residential	20,994	9,375	₦16.5bn	₦16.5bn	25%	4.4 yr
Shed	12,478	5,119	₦418m	₦418m	11%	9.4 yr
Residential Formal	1,928	2	₦47.3m	₦47.3m	19%	5.6 yr
Residential Informal	485	341	₦118m	₦118m	47%	2.1 yr
Institutional	347	304	₦2.06bn	₦2.06bn	57%	1.9 yr
Apartment	267	0	₦6.3m	₦6.3m	23%	4.6 yr
Commercial Corridor	217	217	₦641m	₦641m	49%	2.1 yr
Commercial	213	205	₦1.4bn	₦1.4bn	67%	1.6 yr
Kiosk Shop	181	178	₦30.9m	₦30.9m	47%	2.4 yr
Educational Facility	152	139	₦666m	₦666m	81%	1.4 yr
School	126	112	₦224m	₦224m	81%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	59,753	25,915	₦26.9bn	₦26.9bn

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	58,830	25,061	₦21.6bn	₦21.5bn	25%	4.4 yr
Enterprise	485	425	₦3.32bn	₦3.3bn	73%	1.4 yr
SME High	438	429	₦2.05bn	₦2.05bn	63%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	34,734	15,858	₦23.1bn	₦23.1bn
0.0	12,487	5,126	₦419m	₦419m
2.0	8,704	3,915	₦1.27bn	₦1.27bn
4.0	2,953	469	₦1.51bn	₦1.51bn
1.0	729	403	₦66.9m	₦66.9m
5.0	120	119	₦298m	₦298m
6.0	26	25	₦211m	₦211m