Enugu State

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

Nkanu East has 73,221 buildings with a viable rooftop and 1.58 GWp of roof capacity. 22% run a generator, and together they spend ₦23.6bn a year on energy.

Viable buildings

73,221

Usable roof area

7.02 km²

1.58 GWp roof capacity

Energy spend

₦23.6bn/yr

22.3 GWh/yr burned on generators

Median payback

4.9 yr

Median IRR 23% (cash saved)

The savings bracket for Nkanu East

Approach B

Cash saved

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

Current energy spend₦23.6bn/yr

Year-one cash saved₦23.4bn

Lifetime cash saved₦1.23tn

NPV₦188bn

Median IRR23%

Median payback4.9 yr

Unlocked energy22.6 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity123 MWp

Capex₦124bn

Year-one energy value₦109bn

Lifetime energy value₦5.17tn

NPV₦869bn

Median IRR101%

Median payback1.1 yr

Three ways to size Nkanu East'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: 123 MWp
Capital cost: ₦124bn
Year 1 savings: ₦109bn/yr
NPV: ₦869bn
Median IRR: 101%
Median payback: 1.1 yr

The odds a rooftop in Nkanu East pays back quickly

Of the 72,807 buildings in Nkanu East with a modelled payback, 52.6% pay back inside five years and 21.7% inside three.

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How much of Nkanu East's demand actually gets met

Buildings in Nkanu East consume 39.8 GWh/yr but want 62.4 GWh/yr. The 36% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Nkanu East

Loading band economics…

How many rooftops in Nkanu East 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 72,807 buildings with a modelled result out of 73,221 in Nkanu East. 51,235 clear a positive NPV.

Payback

Under 3 years15,833 (22%)

Under 5 years38,316 (53%)

Under 7 years51,146 (70%)

Under 10 years60,327 (83%)

Return (IRR)

Above 10%58,592 (80%)

Above 15%51,235 (70%)

Above 20%41,781 (57%)

Above 25%31,684 (43%)

CO₂ avoided

44 kt/yr

Fuel avoided

11.1 million litres/yr

Energy unlocked

22.6 GWh/yr

Demand that is suppressed today

People served

286k

What hardware costs right now

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

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 East

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	25,175	5,101	₦8.11bn	₦8.03bn	23%	4.9 yr
E	24,888	5,155	₦6.18bn	₦6.18bn	21%	4.9 yr
C	13,801	2,430	₦3.24bn	₦3.24bn	21%	5.1 yr
B	5,740	2,159	₦4.03bn	₦3.92bn	25%	4.4 yr
A	3,617	1,074	₦2.02bn	₦2.01bn	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	70,781	14,026	₦14.4bn	₦14.3bn	23%	4.9 yr
Commercial General	1,093	843	₦3.24bn	₦3.23bn	47%	2.1 yr
Anchor	527	470	₦3.92bn	₦3.88bn	73%	1.4 yr
Industrial	387	310	₦1.82bn	₦1.75bn	67%	1.6 yr
Commercial Retail	313	166	₦45.2m	₦45.2m	35%	3.1 yr
Worship	103	94	₦114m	₦114m	57%	1.9 yr
Filling Station	17	10	₦10.6m	₦10.6m	41%	2.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	26,531	6,266	₦8.41bn	₦8.41bn	25%	4.4 yr
50 100m2	20,076	3,726	₦1.41bn	₦1.41bn	19%	5.6 yr
30 50m2	10,345	1,835	₦340m	₦340m	9%	9.6 yr
Under 30m2	10,248	2,099	₦241m	₦239m	7%	14.4 yr
250 1000m2	5,943	1,937	₦9.1bn	₦9bn	25%	4.1 yr
Over 1000m2	78	56	₦4.06bn	₦3.97bn	63%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	41,912	10,415	₦12.4bn	₦12.4bn	23%	4.6 yr
Unclassified	16,473	2,590	₦5.96bn	₦5.88bn	23%	4.9 yr
Dense Urban	5,712	598	₦503m	₦503m	19%	5.4 yr
Rural	4,810	966	₦884m	₦884m	21%	5.1 yr
Urban Centre	4,314	1,350	₦3.79bn	₦3.69bn	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	27,662	6,433	₦12.6bn	₦12.5bn	25%	4.4 yr
Residential Small	26,324	4,883	₦1.5bn	₦1.5bn	19%	5.9 yr
Shed	15,505	2,560	₦264m	₦264m	9%	13.4 yr
Residential Informal	1,159	109	₦71.9m	₦71.9m	25%	4.6 yr
Institutional	620	535	₦3.79bn	₦3.77bn	55%	1.9 yr
Commercial	346	279	₦1.67bn	₦1.66bn	43%	2.6 yr
Industrial Site	335	276	₦811m	₦809m	67%	1.6 yr
Kiosk Shop	313	166	₦45.2m	₦45.2m	35%	3.1 yr
Educational Facility	205	185	₦659m	₦659m	81%	1.4 yr
School	143	130	₦226m	₦226m	79%	1.4 yr
Agricultural	131	41	₦18.9m	₦18.9m	23%	4.6 yr
Commercial Corridor	131	39	₦228m	₦228m	35%	3.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	73,221	15,919	₦23.6bn	₦23.4bn

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	71,832	14,821	₦15.9bn	₦15.9bn	23%	4.9 yr
Enterprise	895	770	₦5.71bn	₦5.6bn	67%	1.6 yr
SME High	494	328	₦1.91bn	₦1.9bn	39%	2.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
2.0	28,829	6,124	₦4.86bn	₦4.85bn
3.0	19,041	5,268	₦15.4bn	₦15.3bn
0.0	15,608	2,595	₦281m	₦281m
1.0	9,052	1,533	₦436m	₦436m
5.0	283	192	₦1.17bn	₦1.1bn
4.0	281	115	₦369m	₦362m
6.0	127	92	₦1.07bn	₦1.07bn