Ebonyi State

Rooftop solar in Ohaukwu, Ebonyi: what the roofs are worth

Ohaukwu has 98,619 buildings with a viable rooftop and 1.79 GWp of roof capacity. 22% run a generator, and together they spend ₦24.5bn a year on energy.

Viable buildings

98,619

Usable roof area

7.97 km²

1.79 GWp roof capacity

Energy spend

₦24.5bn/yr

25.2 GWh/yr burned on generators

Median payback

5.1 yr

Median IRR 21% (cash saved)

The savings bracket for Ohaukwu

Approach B

Cash saved

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

Current energy spend₦24.5bn/yr

Year-one cash saved₦24.5bn

Lifetime cash saved₦1.31tn

NPV₦200bn

Median IRR21%

Median payback5.1 yr

Unlocked energy26 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity147 MWp

Capex₦144bn

Year-one energy value₦127bn

Lifetime energy value₦6.02tn

NPV₦1.01tn

Median IRR101%

Median payback1.1 yr

Three ways to size Ohaukwu'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: 147 MWp
Capital cost: ₦144bn
Year 1 savings: ₦127bn/yr
NPV: ₦1.01tn
Median IRR: 101%
Median payback: 1.1 yr

The odds a rooftop in Ohaukwu pays back quickly

Of the 97,655 buildings in Ohaukwu with a modelled payback, 47.4% pay back inside five years and 21.5% inside three.

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How much of Ohaukwu's demand actually gets met

Buildings in Ohaukwu consume 42.3 GWh/yr but want 68.3 GWh/yr. The 38% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Ohaukwu

Loading band economics…

How many rooftops in Ohaukwu 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 97,655 buildings with a modelled result out of 98,619 in Ohaukwu. 64,160 clear a positive NPV.

Payback

Under 3 years20,971 (21%)

Under 5 years46,304 (47%)

Under 7 years64,061 (66%)

Under 10 years75,639 (77%)

Return (IRR)

Above 10%73,281 (74%)

Above 15%64,160 (65%)

Above 20%51,408 (52%)

Above 25%37,522 (38%)

CO₂ avoided

46 kt/yr

Fuel avoided

11.1 million litres/yr

Energy unlocked

26 GWh/yr

Demand that is suppressed today

People served

317k

What hardware costs right now

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

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 Ohaukwu

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	45,362	10,519	₦12.2bn	₦12.2bn	21%	5.1 yr
E	37,486	6,123	₦6.48bn	₦6.48bn	19%	5.4 yr
C	15,177	4,386	₦5.58bn	₦5.57bn	23%	4.6 yr
B	594	410	₦265m	₦265m	29%	3.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	93,975	17,858	₦11.8bn	₦11.8bn	19%	5.4 yr
Commercial General	2,097	1,521	₦5.78bn	₦5.78bn	51%	2.1 yr
Anchor	877	785	₦5.12bn	₦5.12bn	75%	1.4 yr
Worship	714	613	₦625m	₦625m	59%	1.9 yr
Commercial Retail	472	264	₦51.6m	₦51.6m	35%	3.1 yr
Industrial	453	372	₦1.05bn	₦1.04bn	67%	1.6 yr
Filling Station	29	23	₦61m	₦61m	57%	1.9 yr
Hospitality	1	1	₦74.9m	₦72.6m	69%	1.6 yr
Mall Retail	1	1	₦298k	₦298k	47%	2.1 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
50 100m2	32,353	6,087	₦2.4bn	₦2.39bn	19%	5.4 yr
100 250m2	29,817	7,223	₦8.44bn	₦8.44bn	25%	4.4 yr
Under 30m2	16,006	3,180	₦335m	₦330m	7%	15.4 yr
30 50m2	15,073	2,788	₦514m	₦514m	9%	9.9 yr
250 1000m2	5,284	2,110	₦9.62bn	₦9.62bn	27%	4.1 yr
Over 1000m2	86	50	₦3.21bn	₦3.21bn	45%	2.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	69,514	13,973	₦15.1bn	₦15.1bn	21%	5.4 yr
Unclassified	10,852	963	₦1.47bn	₦1.47bn	19%	5.4 yr
Urban Centre	9,423	2,669	₦4.22bn	₦4.22bn	21%	4.9 yr
Dense Urban	8,524	3,575	₦3.42bn	₦3.42bn	25%	4.4 yr
Rural	306	258	₦317m	₦317m	75%	1.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	43,461	7,858	₦2.48bn	₦2.48bn	19%	5.6 yr
Residential	24,685	5,117	₦7.91bn	₦7.91bn	25%	4.4 yr
Shed	23,459	3,061	₦317m	₦317m	7%	14.4 yr
Residential Formal	2,269	1,784	₦1.04bn	₦1.04bn	57%	1.9 yr
Institutional	1,129	983	₦4.44bn	₦4.44bn	55%	1.9 yr
Commercial	843	410	₦2.37bn	₦2.37bn	35%	3.1 yr
Kiosk Shop	472	264	₦51.6m	₦51.6m	35%	3.1 yr
Industrial Site	399	333	₦972m	₦969m	67%	1.6 yr
Educational Facility	392	356	₦1.03bn	₦1.03bn	81%	1.4 yr
Worship Center	275	235	₦114m	₦114m	61%	1.6 yr
School	225	201	₦358m	₦358m	79%	1.4 yr
Commercial Corridor	223	209	₦535m	₦535m	39%	2.9 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	98,619	21,438	₦24.5bn	₦24.5bn

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	96,227	19,663	₦15.4bn	₦15.4bn	21%	5.4 yr
Enterprise	1,295	1,131	₦6.12bn	₦6.11bn	71%	1.4 yr
SME High	1,097	644	₦3.04bn	₦3.04bn	37%	2.9 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
2.0	42,313	8,568	₦4.11bn	₦4.11bn
0.0	23,377	3,039	₦321m	₦321m
3.0	18,850	5,983	₦14.7bn	₦14.7bn
1.0	10,932	1,666	₦441m	₦441m
4.0	2,452	1,818	₦2.89bn	₦2.89bn
5.0	536	271	₦958m	₦958m
6.0	159	93	₦1.05bn	₦1.05bn