Enugu State

Rooftop solar in Nkanu West, Enugu: what the roofs are worth

Nkanu West has 47,731 buildings with a viable rooftop and 1.11 GWp of roof capacity. 23% run a generator, and together they spend ₦22bn a year on energy.

Viable buildings

47,731

Usable roof area

4.94 km²

1.11 GWp roof capacity

Energy spend

₦22bn/yr

21.3 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Nkanu West

Approach B

Cash saved

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

Current energy spend₦22bn/yr

Year-one cash saved₦22bn

Lifetime cash saved₦1.18tn

NPV₦178bn

Median IRR25%

Median payback4.4 yr

Unlocked energy24.6 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity115 MWp

Capex₦112bn

Year-one energy value₦89.8bn

Lifetime energy value₦4.25tn

NPV₦706bn

Median IRR93%

Median payback1.1 yr

Three ways to size Nkanu West'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: 115 MWp
Capital cost: ₦112bn
Year 1 savings: ₦89.8bn/yr
NPV: ₦706bn
Median IRR: 93%
Median payback: 1.1 yr

The odds a rooftop in Nkanu West pays back quickly

Of the 47,518 buildings in Nkanu West with a modelled payback, 59.3% pay back inside five years and 22.4% inside three.

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How much of Nkanu West's demand actually gets met

Buildings in Nkanu West consume 42.1 GWh/yr but want 66.7 GWh/yr. The 37% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Nkanu West

Loading band economics…

How many rooftops in Nkanu West 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 47,518 buildings with a modelled result out of 47,731 in Nkanu West. 37,432 clear a positive NPV.

Payback

Under 3 years10,654 (22%)

Under 5 years28,170 (59%)

Under 7 years37,363 (79%)

Under 10 years42,343 (89%)

Return (IRR)

Above 10%41,538 (87%)

Above 15%37,432 (78%)

Above 20%30,343 (64%)

Above 25%24,124 (51%)

CO₂ avoided

42.6 kt/yr

Fuel avoided

9.36 million litres/yr

Energy unlocked

24.6 GWh/yr

Demand that is suppressed today

People served

196k

What hardware costs right now

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

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 Nkanu West

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
C	24,234	5,668	₦10.7bn	₦10.7bn	25%	4.4 yr
B	13,148	3,728	₦7.97bn	₦7.95bn	25%	4.4 yr
D	6,182	686	₦1.66bn	₦1.66bn	21%	5.4 yr
E	4,080	757	₦1.65bn	₦1.65bn	21%	5.1 yr
A	87	3	₦1.78m	₦1.78m	19%	5.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	44,669	8,838	₦10.3bn	₦10.3bn	25%	4.6 yr
Commercial General	1,636	1,040	₦6.22bn	₦6.21bn	41%	2.6 yr
Commercial Retail	889	520	₦140m	₦140m	35%	3.1 yr
Anchor	349	294	₦4.97bn	₦4.97bn	55%	1.9 yr
Industrial	113	87	₦230m	₦230m	65%	1.6 yr
Worship	50	45	₦48.9m	₦48.9m	49%	2.1 yr
Filling Station	23	16	₦43.2m	₦43.2m	61%	1.6 yr
Hospitality	2	2	₦41.9m	₦41.9m	59%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	17,439	3,866	₦5.55bn	₦5.55bn	25%	4.4 yr
50 100m2	11,897	2,441	₦995m	₦995m	21%	5.1 yr
Under 30m2	7,103	1,560	₦182m	₦182m	13%	7.6 yr
30 50m2	6,519	1,398	₦261m	₦261m	15%	6.6 yr
250 1000m2	4,661	1,506	₦10.3bn	₦10.3bn	25%	4.1 yr
Over 1000m2	112	71	₦4.72bn	₦4.72bn	47%	2.1 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	18,127	4,030	₦10bn	₦10bn	25%	4.4 yr
Dense Urban	15,328	4,205	₦7.27bn	₦7.27bn	25%	4.4 yr
Urban Centre	8,739	1,578	₦2.22bn	₦2.22bn	23%	4.6 yr
Unclassified	5,537	1,029	₦2.48bn	₦2.48bn	23%	4.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	17,516	3,853	₦9.05bn	₦9.05bn	25%	4.4 yr
Residential Small	16,005	3,184	₦1.06bn	₦1.06bn	21%	5.1 yr
Shed	10,160	1,792	₦169m	₦169m	13%	8.4 yr
Residential Formal	968	0	₦21.4m	₦21.4m	21%	5.4 yr
Commercial	950	596	₦4.19bn	₦4.17bn	39%	2.6 yr
Kiosk Shop	889	520	₦140m	₦140m	35%	3.1 yr
Commercial Corridor	386	203	₦1.24bn	₦1.24bn	35%	3.1 yr
Institutional	267	225	₦3.04bn	₦3.04bn	51%	2.1 yr
Educational Facility	115	98	₦340m	₦340m	73%	1.4 yr
School	94	78	₦186m	₦186m	73%	1.4 yr
Industrial Site	75	60	₦179m	₦179m	65%	1.6 yr
Unknown	54	42	₦229m	₦229m	43%	2.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	47,731	10,842	₦22bn	₦22bn

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	45,941	9,666	₦11.4bn	₦11.4bn	25%	4.4 yr
SME High	1,359	815	₦5.45bn	₦5.43bn	37%	2.9 yr
Enterprise	431	361	₦5.17bn	₦5.17bn	55%	1.9 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
2.0	17,971	3,705	₦2.3bn	₦2.3bn
3.0	13,497	3,881	₦14.5bn	₦14.5bn
0.0	10,147	1,790	₦169m	₦169m
1.0	4,609	1,147	₦296m	₦296m
4.0	1,294	273	₦3.74bn	₦3.72bn
5.0	154	38	₦764m	₦764m
6.0	59	8	₦191m	₦191m