Anambra State

Rooftop solar in Nnewi North, Anambra: what the roofs are worth

Nnewi North has 81,018 buildings with a viable rooftop and 1.93 GWp of roof capacity. 49% run a generator, and together they spend ₦45.7bn a year on energy.

Viable buildings

81,018

Usable roof area

8.58 km²

1.93 GWp roof capacity

Energy spend

₦45.7bn/yr

34.4 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Nnewi North

Approach B

Cash saved

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

Current energy spend₦45.7bn/yr

Year-one cash saved₦45.1bn

Lifetime cash saved₦2.46tn

NPV₦348bn

Median IRR25%

Median payback4.4 yr

Unlocked energy42.9 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity172 MWp

Capex₦172bn

Year-one energy value₦112bn

Lifetime energy value₦5.27tn

NPV₦841bn

Median IRR67%

Median payback1.6 yr

Three ways to size Nnewi North'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: 172 MWp
Capital cost: ₦172bn
Year 1 savings: ₦112bn/yr
NPV: ₦841bn
Median IRR: 67%
Median payback: 1.6 yr

The odds a rooftop in Nnewi North pays back quickly

Of the 80,828 buildings in Nnewi North with a modelled payback, 79.3% pay back inside five years and 39.6% inside three.

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How much of Nnewi North's demand actually gets met

Buildings in Nnewi North consume 87.8 GWh/yr but want 131 GWh/yr. The 33% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Nnewi North

Loading band economics…

How many rooftops in Nnewi North 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 80,828 buildings with a modelled result out of 81,018 in Nnewi North. 74,761 clear a positive NPV.

Payback

Under 3 years31,983 (40%)

Under 5 years64,090 (79%)

Under 7 years74,677 (92%)

Under 10 years78,626 (97%)

Return (IRR)

Above 10%78,209 (97%)

Above 15%74,761 (92%)

Above 20%67,478 (83%)

Above 25%48,402 (60%)

CO₂ avoided

89.8 kt/yr

Fuel avoided

20.7 million litres/yr

Energy unlocked

42.9 GWh/yr

Demand that is suppressed today

People served

221k

What hardware costs right now

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

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 Nnewi North

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
B	40,587	26,598	₦28.1bn	₦27.8bn	39%	2.9 yr
A	30,445	10,050	₦11bn	₦11bn	25%	4.4 yr
C	9,307	2,931	₦5.62bn	₦5.4bn	25%	4.4 yr
E	361	258	₦525m	₦525m	71%	1.4 yr
D	318	227	₦411m	₦402m	73%	1.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	79,330	39,151	₦35.4bn	₦35.2bn	25%	4.4 yr
Anchor	583	280	₦7.41bn	₦6.95bn	39%	2.6 yr
Commercial General	538	315	₦1.42bn	₦1.42bn	35%	3.1 yr
Worship	247	150	₦250m	₦250m	41%	2.6 yr
Industrial	197	119	₦813m	₦811m	41%	2.6 yr
Hospitality	58	20	₦380m	₦372m	33%	3.1 yr
Filling Station	24	12	₦24.5m	₦24.5m	35%	3.1 yr
Mall Retail	18	3	₦52m	₦52m	33%	3.1 yr
Commercial Retail	15	12	₦3.69m	₦3.69m	43%	2.4 yr
Productive Use	5	2	₦1.38m	₦1.38m	33%	3.1 yr
Automotive	3	0	₦3.49m	₦3.49m	31%	3.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	26,724	13,240	₦15.8bn	₦15.6bn	27%	4.1 yr
50 100m2	17,892	8,787	₦2.72bn	₦2.72bn	25%	4.4 yr
Under 30m2	14,948	7,433	₦598m	₦594m	21%	5.1 yr
30 50m2	11,336	5,594	₦834m	₦834m	25%	4.4 yr
250 1000m2	9,918	4,933	₦18.7bn	₦18.7bn	27%	4.1 yr
Over 1000m2	200	77	₦7.06bn	₦6.66bn	31%	3.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	78,542	38,843	₦44bn	₦43.3bn	25%	4.4 yr
Unclassified	2,476	1,221	₦1.76bn	₦1.76bn	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Formal	28,807	14,125	₦8.11bn	₦8.11bn	25%	4.4 yr
Residential Informal	21,368	7,687	₦4.7bn	₦4.7bn	25%	4.4 yr
Residential Small	9,166	5,764	₦2.56bn	₦2.56bn	53%	2.1 yr
Residential	8,076	5,172	₦18.2bn	₦18.1bn	55%	1.9 yr
Shed	7,322	4,129	₦420m	₦420m	35%	3.1 yr
Apartment	3,165	1,555	₦919m	₦919m	25%	4.4 yr
Duplex	1,335	671	₦397m	₦397m	27%	4.1 yr
Institutional	512	293	₦5.88bn	₦5.47bn	35%	3.1 yr
Healthcare Facility	152	65	₦988m	₦941m	29%	3.9 yr
Industrial Site	150	96	₦699m	₦698m	45%	2.4 yr
School	112	67	₦322m	₦322m	47%	2.4 yr
Educational Facility	110	66	₦438m	₦438m	49%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	80,706	39,901	₦44.8bn	₦44.1bn
Industrial	308	159	₦965m	₦965m
Farmland	4	4	₦1.75m	₦1.75m

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	80,133	39,615	₦37.2bn	₦37bn	25%	4.4 yr
Enterprise	776	396	₦8.2bn	₦7.74bn	41%	2.6 yr
SME High	109	53	₦339m	₦339m	35%	3.1 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
4.0	39,881	17,801	₦18.4bn	₦18.3bn
3.0	23,420	12,957	₦25.3bn	₦24.8bn
2.0	9,223	4,579	₦1.35bn	₦1.34bn
0.0	7,269	4,150	₦430m	₦430m
1.0	1,198	571	₦45.5m	₦45.4m
5.0	22	5	₦86.2m	₦86.2m
6.0	5	1	₦123m	₦123m