Abia State

Rooftop solar in Isuikwuato, Abia: what the roofs are worth

Isuikwuato has 41,088 buildings with a viable rooftop and 937 MWp of roof capacity. 32% run a generator, and together they spend ₦49.8bn a year on energy.

Viable buildings

41,088

Usable roof area

4.17 km²

937 MWp roof capacity

Energy spend

₦49.8bn/yr

53.6 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Isuikwuato

Approach B

Cash saved

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

Current energy spend₦49.8bn/yr

Year-one cash saved₦47.8bn

Lifetime cash saved₦2.43tn

NPV₦385bn

Median IRR25%

Median payback4.4 yr

Unlocked energy23.4 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity136 MWp

Capex₦136bn

Year-one energy value₦121bn

Lifetime energy value₦5.74tn

NPV₦969bn

Median IRR99%

Median payback1.1 yr

Three ways to size Isuikwuato'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: 136 MWp
Capital cost: ₦136bn
Year 1 savings: ₦121bn/yr
NPV: ₦969bn
Median IRR: 99%
Median payback: 1.1 yr

The odds a rooftop in Isuikwuato pays back quickly

Of the 40,952 buildings in Isuikwuato with a modelled payback, 65.0% pay back inside five years and 32.3% inside three.

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How much of Isuikwuato's demand actually gets met

Buildings in Isuikwuato consume 67.1 GWh/yr but want 90.5 GWh/yr. The 26% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Isuikwuato

Loading band economics…

How many rooftops in Isuikwuato 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 40,952 buildings with a modelled result out of 41,088 in Isuikwuato. 33,055 clear a positive NPV.

Payback

Under 3 years13,215 (32%)

Under 5 years26,637 (65%)

Under 7 years33,010 (81%)

Under 10 years37,220 (91%)

Return (IRR)

Above 10%36,273 (88%)

Above 15%33,055 (80%)

Above 20%28,665 (70%)

Above 25%19,360 (47%)

CO₂ avoided

76.4 kt/yr

Fuel avoided

25.1 million litres/yr

Energy unlocked

23.4 GWh/yr

Demand that is suppressed today

People served

211k

What hardware costs right now

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

Solar panels

₦250

₦/W

Inverters

₦127,419

₦/kVA

Batteries

₦177,500

₦/kWh

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Building mix in Isuikwuato

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	17,340	5,324	₦20bn	₦19.1bn	25%	4.4 yr
E	13,272	4,031	₦13.5bn	₦13.2bn	25%	4.4 yr
C	10,476	3,856	₦16.3bn	₦15.5bn	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	39,412	11,614	₦29.8bn	₦28.8bn	25%	4.4 yr
Commercial General	832	800	₦6.62bn	₦6.5bn	65%	1.6 yr
Anchor	375	354	₦11.9bn	₦11.3bn	77%	1.4 yr
Commercial Retail	277	269	₦164m	₦164m	63%	1.6 yr
Worship	90	87	₦160m	₦160m	61%	1.6 yr
Industrial	87	73	₦264m	₦261m	69%	1.6 yr
Hospitality	8	8	₦921m	₦621m	71%	1.4 yr
Filling Station	7	6	₦14.4m	₦14.4m	65%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	13,964	4,385	₦13.6bn	₦13.1bn	25%	4.4 yr
50 100m2	11,289	3,200	₦2.76bn	₦2.72bn	23%	4.9 yr
Under 30m2	6,101	2,048	₦362m	₦358m	9%	9.9 yr
30 50m2	5,621	1,718	₦550m	₦549m	13%	7.4 yr
250 1000m2	4,004	1,782	₦20.5bn	₦19.8bn	25%	4.1 yr
Over 1000m2	109	78	₦12.1bn	₦11.3bn	73%	1.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	17,051	4,093	₦15.4bn	₦14.4bn	25%	4.4 yr
Urban	12,816	5,055	₦23.1bn	₦22.4bn	25%	4.4 yr
Dense Urban	7,712	3,064	₦7.08bn	₦7.01bn	25%	4.4 yr
Unclassified	3,306	911	₦3.94bn	₦3.73bn	25%	4.4 yr
Rural	203	88	₦261m	₦261m	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	17,221	4,673	₦3.57bn	₦3.54bn	23%	4.9 yr
Residential	12,773	4,071	₦25.4bn	₦24.4bn	25%	4.4 yr
Shed	7,772	2,352	₦329m	₦329m	11%	9.4 yr
Residential Formal	942	164	₦78.8m	₦78.8m	23%	4.9 yr
Residential Informal	565	330	₦408m	₦408m	57%	1.9 yr
Commercial	444	436	₦4.02bn	₦3.91bn	65%	1.6 yr
Institutional	293	268	₦9.06bn	₦8.76bn	59%	1.9 yr
Kiosk Shop	277	269	₦164m	₦164m	63%	1.6 yr
Commercial Corridor	130	130	₦1.18bn	₦1.18bn	69%	1.6 yr
Educational Facility	113	106	₦708m	₦708m	83%	1.1 yr
School	92	90	₦400m	₦400m	83%	1.4 yr
Industrial Site	67	56	₦207m	₦204m	69%	1.6 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	40,803	13,142	₦42.7bn	₦40.7bn
Commercial	193	0	₦1.12m	₦1.12m
Industrial	92	69	₦7.11bn	₦7.09bn

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	40,064	12,229	₦33bn	₦31.5bn	25%	4.4 yr
SME High	572	565	₦4.75bn	₦4.75bn	67%	1.6 yr
Enterprise	452	417	₦12.1bn	₦11.5bn	73%	1.4 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	24,518	7,990	₦42.4bn	₦40.8bn
0.0	7,789	2,356	₦333m	₦333m
2.0	6,493	1,873	₦1.41bn	₦1.38bn
4.0	1,364	524	₦4.08bn	₦3.97bn
1.0	909	454	₦227m	₦227m
5.0	14	14	₦1.4bn	₦1.1bn
6.0	1	0	₦7.88m	₦7.88m