Enugu State

Rooftop solar in Igbo-Eze-South, Enugu: what the roofs are worth

Igbo-Eze-South has 78,113 buildings with a viable rooftop and 1.28 GWp of roof capacity. 20% run a generator, and together they spend ₦16bn a year on energy.

Viable buildings

78,113

Usable roof area

5.72 km²

1.28 GWp roof capacity

Energy spend

₦16bn/yr

14.1 GWh/yr burned on generators

Median payback

5.4 yr

Median IRR 21% (cash saved)

The savings bracket for Igbo-Eze-South

Approach B

Cash saved

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

Current energy spend₦16bn/yr

Year-one cash saved₦15.8bn

Lifetime cash saved₦838bn

NPV₦126bn

Median IRR21%

Median payback5.4 yr

Unlocked energy16.2 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity90.9 MWp

Capex₦95.7bn

Year-one energy value₦84.2bn

Lifetime energy value₦4.01tn

NPV₦674bn

Median IRR99%

Median payback1.1 yr

Three ways to size Igbo-Eze-South'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: 90.9 MWp
Capital cost: ₦95.7bn
Year 1 savings: ₦84.2bn/yr
NPV: ₦674bn
Median IRR: 99%
Median payback: 1.1 yr

The odds a rooftop in Igbo-Eze-South pays back quickly

Of the 77,137 buildings in Igbo-Eze-South with a modelled payback, 46.9% pay back inside five years and 19.5% inside three.

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How much of Igbo-Eze-South's demand actually gets met

Buildings in Igbo-Eze-South consume 25.6 GWh/yr but want 41.8 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 Igbo-Eze-South

Loading band economics…

How many rooftops in Igbo-Eze-South 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 77,137 buildings with a modelled result out of 78,113 in Igbo-Eze-South. 50,094 clear a positive NPV.

Payback

Under 3 years15,073 (20%)

Under 5 years36,203 (47%)

Under 7 years50,008 (65%)

Under 10 years59,043 (77%)

Return (IRR)

Above 10%57,117 (73%)

Above 15%50,094 (64%)

Above 20%39,666 (51%)

Above 25%30,584 (39%)

CO₂ avoided

30.8 kt/yr

Fuel avoided

7.96 million litres/yr

Energy unlocked

16.2 GWh/yr

Demand that is suppressed today

People served

238k

What hardware costs right now

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

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 Igbo-Eze-South

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
C	32,654	7,525	₦7.62bn	₦7.62bn	21%	5.1 yr
D	18,617	3,529	₦3.79bn	₦3.79bn	19%	5.6 yr
E	17,842	2,903	₦3.55bn	₦3.36bn	19%	5.6 yr
B	9,000	1,450	₦1.05bn	₦1.05bn	21%	4.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	77,070	14,674	₦12.4bn	₦12.3bn	21%	5.4 yr
Anchor	414	366	₦2.49bn	₦2.37bn	63%	1.6 yr
Commercial General	400	266	₦981m	₦981m	51%	2.1 yr
Commercial Retail	98	4	₦4.46m	₦4.46m	33%	3.4 yr
Industrial	68	51	₦80.7m	₦80.5m	63%	1.6 yr
Worship	36	28	₦59.1m	₦59.1m	49%	2.1 yr
Filling Station	25	17	₦20.1m	₦20.1m	47%	2.4 yr
Hospitality	2	1	₦672k	₦672k	27%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	24,691	5,357	₦7.64bn	₦7.64bn	25%	4.4 yr
Under 30m2	20,726	3,692	₦324m	₦324m	7%	14.6 yr
50 100m2	17,775	3,127	₦1.14bn	₦1.14bn	19%	5.6 yr
30 50m2	11,968	2,125	₦416m	₦332m	11%	9.1 yr
250 1000m2	2,920	1,090	₦5.67bn	₦5.56bn	25%	4.1 yr
Over 1000m2	33	16	₦819m	₦819m	27%	4.1 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	57,701	12,599	₦11.1bn	₦11.1bn	21%	5.4 yr
Dense Urban	9,882	1,600	₦2.3bn	₦2.21bn	21%	5.4 yr
Urban	8,976	955	₦2.31bn	₦2.22bn	21%	5.1 yr
Unclassified	1,554	253	₦294m	₦294m	17%	6.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	29,468	6,438	₦10.2bn	₦10.2bn	25%	4.4 yr
Shed	22,590	3,564	₦309m	₦309m	7%	13.9 yr
Residential Small	17,110	3,624	₦1.25bn	₦1.17bn	19%	5.4 yr
Residential Formal	5,348	192	₦129m	₦129m	19%	5.6 yr
Residential Informal	2,430	851	₦452m	₦452m	25%	4.4 yr
Institutional	278	241	₦1.37bn	₦1.37bn	55%	1.9 yr
Educational Facility	144	136	₦537m	₦537m	81%	1.4 yr
School	106	99	₦224m	₦224m	79%	1.4 yr
Kiosk Shop	98	4	₦4.46m	₦4.46m	33%	3.4 yr
Commercial Corridor	92	0	₦38.4m	₦38.4m	33%	3.1 yr
Apartment	79	2	₦2.32m	₦2.32m	25%	4.4 yr
Healthcare Facility	73	59	₦830m	₦725m	51%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	78,113	15,407	₦16bn	₦15.8bn

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	77,484	14,947	₦13.3bn	₦13.2bn	21%	5.4 yr
Enterprise	480	415	₦2.57bn	₦2.45bn	63%	1.6 yr
SME High	149	45	₦194m	₦194m	35%	3.1 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	23,948	5,498	₦11.7bn	₦11.6bn
0.0	22,552	3,527	₦297m	₦297m
2.0	20,220	4,353	₦2.98bn	₦2.89bn
1.0	6,559	1,660	₦274m	₦274m
4.0	4,763	364	₦653m	₦653m
5.0	68	4	₦58.7m	₦58.7m
6.0	3	1	₦13.6m	₦13.6m