Imo State

Rooftop solar in Aboh-Mbaise, Imo: what the roofs are worth

Aboh-Mbaise has 70,387 buildings with a viable rooftop and 1.62 GWp of roof capacity. 39% run a generator, and together they spend ₦33.8bn a year on energy.

Viable buildings

70,387

Usable roof area

7.19 km²

1.62 GWp roof capacity

Energy spend

₦33.8bn/yr

31.8 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Aboh-Mbaise

Approach B

Cash saved

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

Current energy spend₦33.8bn/yr

Year-one cash saved₦33.6bn

Lifetime cash saved₦1.74tn

NPV₦273bn

Median IRR25%

Median payback4.4 yr

Unlocked energy30.4 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity153 MWp

Capex₦156bn

Year-one energy value₦136bn

Lifetime energy value₦6.46tn

NPV₦1.08tn

Median IRR97%

Median payback1.1 yr

Three ways to size Aboh-Mbaise'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: 153 MWp
Capital cost: ₦156bn
Year 1 savings: ₦136bn/yr
NPV: ₦1.08tn
Median IRR: 97%
Median payback: 1.1 yr

The odds a rooftop in Aboh-Mbaise pays back quickly

Of the 69,957 buildings in Aboh-Mbaise with a modelled payback, 65.9% pay back inside five years and 39.0% inside three.

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How much of Aboh-Mbaise's demand actually gets met

Buildings in Aboh-Mbaise consume 47.1 GWh/yr but want 77.5 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 Aboh-Mbaise

Loading band economics…

How many rooftops in Aboh-Mbaise 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 69,957 buildings with a modelled result out of 70,387 in Aboh-Mbaise. 55,931 clear a positive NPV.

Payback

Under 3 years27,285 (39%)

Under 5 years46,076 (66%)

Under 7 years55,827 (80%)

Under 10 years62,070 (89%)

Return (IRR)

Above 10%60,685 (86%)

Above 15%55,931 (79%)

Above 20%48,945 (70%)

Above 25%28,351 (40%)

CO₂ avoided

62.4 kt/yr

Fuel avoided

18 million litres/yr

Energy unlocked

30.4 GWh/yr

Demand that is suppressed today

People served

325k

What hardware costs right now

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

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 Aboh-Mbaise

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
E	28,635	11,977	₦14.5bn	₦14.4bn	25%	4.4 yr
D	25,545	10,131	₦13.4bn	₦13.4bn	25%	4.4 yr
C	14,984	4,854	₦5.43bn	₦5.43bn	25%	4.6 yr
B	1,223	357	₦463m	₦463m	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	67,980	25,361	₦25.4bn	₦25.3bn	25%	4.4 yr
Commercial General	1,191	959	₦4.01bn	₦4.01bn	49%	2.1 yr
Anchor	516	437	₦3.63bn	₦3.54bn	59%	1.9 yr
Commercial Retail	436	338	₦70.3m	₦70.3m	37%	2.6 yr
Worship	131	110	₦311m	₦311m	61%	1.9 yr
Industrial	105	88	₦351m	₦351m	67%	1.6 yr
Filling Station	25	23	₦27.6m	₦27.6m	63%	1.6 yr
Hospitality	3	3	₦5.65m	₦5.65m	65%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	27,605	10,603	₦14bn	₦14bn	25%	4.4 yr
50 100m2	15,572	5,896	₦2.13bn	₦2.13bn	23%	4.9 yr
Under 30m2	11,227	4,323	₦385m	₦384m	9%	12.9 yr
30 50m2	9,017	3,413	₦543m	₦543m	13%	7.6 yr
250 1000m2	6,874	3,017	₦13.7bn	₦13.7bn	25%	4.4 yr
Over 1000m2	92	67	₦3.02bn	₦2.86bn	71%	1.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	44,573	16,434	₦18bn	₦17.9bn	25%	4.4 yr
Urban	19,158	8,240	₦11.7bn	₦11.6bn	25%	4.4 yr
Unclassified	4,102	1,309	₦1.91bn	₦1.91bn	25%	4.6 yr
Dense Urban	2,554	1,336	₦2.22bn	₦2.22bn	61%	1.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	27,433	10,197	₦3.36bn	₦3.36bn	21%	4.9 yr
Residential	26,631	10,186	₦21.6bn	₦21.5bn	25%	4.4 yr
Shed	13,870	4,973	₦433m	₦433m	9%	9.6 yr
Kiosk Shop	436	338	₦70.3m	₦70.3m	37%	2.6 yr
Commercial	429	354	₦2.12bn	₦2.12bn	63%	1.6 yr
Institutional	393	331	₦2.43bn	₦2.4bn	57%	1.9 yr
Commercial Corridor	362	280	₦725m	₦725m	39%	2.9 yr
Educational Facility	173	140	₦568m	₦568m	81%	1.4 yr
School	130	110	₦241m	₦241m	79%	1.4 yr
Healthcare Facility	89	76	₦874m	₦873m	51%	2.1 yr
Industrial Site	70	59	₦241m	₦241m	69%	1.6 yr
Clinic	60	52	₦581m	₦524m	51%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	70,238	27,318	₦33.8bn	₦33.6bn
Retail	126	0	₦519k	₦519k
Commercial	23	1	₦4.03m	₦4.03m

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	68,949	26,136	₦27bn	₦26.9bn	25%	4.4 yr
SME High	817	658	₦2.87bn	₦2.87bn	45%	2.4 yr
Enterprise	621	525	₦3.98bn	₦3.89bn	61%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	47,001	18,320	₦29.7bn	₦29.5bn
0.0	13,873	4,976	₦434m	₦434m
2.0	7,294	2,997	₦918m	₦918m
4.0	1,127	331	₦1.48bn	₦1.48bn
1.0	799	446	₦78m	₦77.7m
5.0	195	176	₦673m	₦673m
6.0	98	73	₦517m	₦517m