Imo State

Rooftop solar in Nkwerre, Imo: what the roofs are worth

Nkwerre has 22,104 buildings with a viable rooftop and 584 MWp of roof capacity. 45% run a generator, and together they spend ₦11.4bn a year on energy.

Viable buildings

22,104

Usable roof area

2.6 km²

584 MWp roof capacity

Energy spend

₦11.4bn/yr

10.3 GWh/yr burned on generators

Median payback

3.9 yr

Median IRR 29% (cash saved)

The savings bracket for Nkwerre

Approach B

Cash saved

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

Current energy spend₦11.4bn/yr

Year-one cash saved₦11.1bn

Lifetime cash saved₦590bn

NPV₦93.1bn

Median IRR29%

Median payback3.9 yr

Unlocked energy11.8 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity41.3 MWp

Capex₦42.9bn

Year-one energy value₦39.6bn

Lifetime energy value₦1.89tn

NPV₦320bn

Median IRR97%

Median payback1.1 yr

Three ways to size Nkwerre'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: 41.3 MWp
Capital cost: ₦42.9bn
Year 1 savings: ₦39.6bn/yr
NPV: ₦320bn
Median IRR: 97%
Median payback: 1.1 yr

The odds a rooftop in Nkwerre pays back quickly

Of the 22,078 buildings in Nkwerre with a modelled payback, 79.7% pay back inside five years and 41.4% inside three.

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How much of Nkwerre's demand actually gets met

Buildings in Nkwerre consume 18.1 GWh/yr but want 29.9 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 Nkwerre

Loading band economics…

How many rooftops in Nkwerre 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 22,078 buildings with a modelled result out of 22,104 in Nkwerre. 19,989 clear a positive NPV.

Payback

Under 3 years9,150 (41%)

Under 5 years17,586 (80%)

Under 7 years19,996 (91%)

Under 10 years21,167 (96%)

Return (IRR)

Above 10%20,921 (95%)

Above 15%19,989 (90%)

Above 20%18,450 (83%)

Above 25%16,132 (73%)

CO₂ avoided

21.7 kt/yr

Fuel avoided

5.59 million litres/yr

Energy unlocked

11.8 GWh/yr

Demand that is suppressed today

People served

95k

What hardware costs right now

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

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 Nkwerre

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
B	5,568	2,867	₦2.31bn	₦2.31bn	29%	3.6 yr
C	5,307	2,371	₦2.74bn	₦2.74bn	29%	3.9 yr
E	5,143	2,107	₦2.59bn	₦2.59bn	29%	3.9 yr
A	3,647	1,458	₦825m	₦825m	29%	3.9 yr
D	2,439	1,206	₦2.93bn	₦2.65bn	29%	3.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	21,684	9,662	₦8.27bn	₦8.27bn	29%	3.9 yr
Anchor	161	130	₦2.14bn	₦1.86bn	57%	1.9 yr
Commercial General	153	126	₦788m	₦788m	59%	1.9 yr
Worship	70	58	₦88.2m	₦88.2m	59%	1.9 yr
Commercial Retail	19	19	₦8.59m	₦8.59m	69%	1.6 yr
Industrial	11	10	₦57.9m	₦57.9m	79%	1.4 yr
Filling Station	3	3	₦9.27m	₦9.27m	73%	1.4 yr
Hospitality	3	1	₦24.1m	₦24.1m	35%	3.1 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	8,969	3,948	₦4.06bn	₦4.06bn	29%	3.9 yr
50 100m2	4,886	2,187	₦600m	₦600m	27%	3.9 yr
250 1000m2	3,026	1,441	₦4.61bn	₦4.61bn	29%	3.6 yr
30 50m2	2,692	1,214	₦145m	₦145m	23%	4.9 yr
Under 30m2	2,489	1,187	₦92.1m	₦92.1m	19%	5.6 yr
Over 1000m2	42	32	₦1.89bn	₦1.6bn	61%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	20,723	9,409	₦10.7bn	₦10.4bn	29%	3.9 yr
Unclassified	1,381	600	₦672m	₦672m	29%	3.9 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	7,159	3,539	₦6.77bn	₦6.77bn	29%	3.6 yr
Residential Small	6,064	3,089	₦884m	₦884m	41%	2.4 yr
Residential Formal	3,933	989	₦341m	₦341m	29%	3.9 yr
Shed	3,014	1,478	₦120m	₦120m	23%	4.6 yr
Residential Informal	690	381	₦104m	₦104m	31%	3.6 yr
Apartment	614	139	₦38.9m	₦38.9m	29%	3.9 yr
Duplex	208	46	₦17.8m	₦17.8m	29%	3.9 yr
Institutional	115	94	₦1.44bn	₦1.44bn	53%	2.1 yr
Educational Facility	42	35	₦227m	₦227m	77%	1.4 yr
Commercial	42	42	₦262m	₦262m	71%	1.4 yr
School	35	30	₦84.1m	₦84.1m	77%	1.4 yr
Healthcare Facility	31	25	₦732m	₦449m	43%	2.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	22,104	10,009	₦11.4bn	₦11.1bn

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	21,885	9,823	₦8.9bn	₦8.9bn	29%	3.9 yr
Enterprise	172	140	₦2.2bn	₦1.92bn	57%	1.9 yr
SME High	47	46	₦296m	₦296m	71%	1.4 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	11,101	5,676	₦9.7bn	₦9.42bn
4.0	5,002	1,398	₦1.12bn	₦1.12bn
0.0	3,016	1,479	₦120m	₦120m
2.0	2,793	1,345	₦407m	₦407m
1.0	191	110	₦18m	₦18m
6.0	1	1	₦23.8m	₦23.8m