Abia State

Rooftop solar in Arochukwu, Abia: what the roofs are worth

Arochukwu has 36,989 buildings with a viable rooftop and 909 MWp of roof capacity. 27% run a generator, and together they spend ₦36bn a year on energy.

Viable buildings

36,989

Usable roof area

4.04 km²

909 MWp roof capacity

Energy spend

₦36bn/yr

31.4 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Arochukwu

Approach B

Cash saved

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

Current energy spend₦36bn/yr

Year-one cash saved₦35bn

Lifetime cash saved₦1.83tn

NPV₦280bn

Median IRR25%

Median payback4.4 yr

Unlocked energy24.8 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity132 MWp

Capex₦137bn

Year-one energy value₦117bn

Lifetime energy value₦5.55tn

NPV₦929bn

Median IRR97%

Median payback1.1 yr

Three ways to size Arochukwu'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: 132 MWp
Capital cost: ₦137bn
Year 1 savings: ₦117bn/yr
NPV: ₦929bn
Median IRR: 97%
Median payback: 1.1 yr

The odds a rooftop in Arochukwu pays back quickly

Of the 36,887 buildings in Arochukwu with a modelled payback, 71.7% pay back inside five years and 26.6% inside three.

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How much of Arochukwu's demand actually gets met

Buildings in Arochukwu consume 51.1 GWh/yr but want 76 GWh/yr. The 33% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Arochukwu

Loading band economics…

How many rooftops in Arochukwu 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 36,887 buildings with a modelled result out of 36,989 in Arochukwu. 31,285 clear a positive NPV.

Payback

Under 3 years9,828 (27%)

Under 5 years26,439 (72%)

Under 7 years31,246 (85%)

Under 10 years33,734 (91%)

Return (IRR)

Above 10%33,208 (90%)

Above 15%31,285 (85%)

Above 20%28,064 (76%)

Above 25%15,288 (41%)

CO₂ avoided

63.3 kt/yr

Fuel avoided

18.9 million litres/yr

Energy unlocked

24.8 GWh/yr

Demand that is suppressed today

People served

284k

What hardware costs right now

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

Solar panels

₦250

₦/W

Inverters

₦127,419

₦/kVA

Batteries

₦177,500

₦/kWh

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Building mix in Arochukwu

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
E	10,653	2,757	₦10bn	₦9.92bn	25%	4.4 yr
D	9,899	2,905	₦11.3bn	₦10.8bn	25%	4.4 yr
B	6,409	1,489	₦5.9bn	₦5.73bn	25%	4.4 yr
C	6,167	1,615	₦6.36bn	₦6.22bn	25%	4.4 yr
A	3,861	1,054	₦2.36bn	₦2.33bn	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	35,934	8,997	₦30.4bn	₦29.5bn	25%	4.4 yr
Anchor	427	342	₦3.54bn	₦3.47bn	57%	1.9 yr
Commercial General	353	256	₦1.38bn	₦1.38bn	51%	2.1 yr
Worship	201	172	₦327m	₦327m	59%	1.9 yr
Industrial	58	42	₦277m	₦276m	53%	1.9 yr
Commercial Retail	7	5	₦5.78m	₦5.78m	63%	1.6 yr
Filling Station	7	4	₦7.27m	₦7.27m	37%	2.9 yr
Hospitality	1	1	₦2.66m	₦2.66m	75%	1.4 yr
Productive Use	1	1	₦3.83m	₦3.83m	67%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	13,931	3,686	₦12.9bn	₦12.7bn	25%	4.4 yr
50 100m2	8,771	2,077	₦1.97bn	₦1.97bn	25%	4.4 yr
Under 30m2	5,153	1,286	₦256m	₦254m	9%	9.6 yr
250 1000m2	4,646	1,654	₦18.3bn	₦17.6bn	25%	4.4 yr
30 50m2	4,452	1,093	₦417m	₦417m	19%	5.9 yr
Over 1000m2	36	24	₦2.04bn	₦2.02bn	61%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	14,206	2,532	₦8.14bn	₦8.11bn	25%	4.4 yr
Dense Urban	10,093	3,331	₦11.4bn	₦11.4bn	25%	4.4 yr
Urban	5,633	1,829	₦8.15bn	₦7.76bn	25%	4.4 yr
Unclassified	4,373	1,006	₦3.62bn	₦3.29bn	25%	4.4 yr
Rural	2,684	1,122	₦4.62bn	₦4.38bn	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	11,971	3,312	₦3bn	₦3bn	25%	4.4 yr
Residential	11,787	3,709	₦26.1bn	₦25.1bn	25%	4.4 yr
Residential Formal	6,434	690	₦1.17bn	₦1.17bn	25%	4.4 yr
Shed	5,726	1,283	₦192m	₦192m	9%	9.6 yr
Institutional	348	270	₦1.5bn	₦1.5bn	53%	1.9 yr
Educational Facility	142	112	₦555m	₦555m	77%	1.4 yr
School	116	93	₦332m	₦332m	75%	1.4 yr
Worship Center	68	57	₦42.6m	₦42.6m	61%	1.6 yr
Place Of Worship	66	56	₦43.4m	₦43.4m	61%	1.6 yr
Healthcare Facility	64	50	₦1.28bn	₦1.23bn	51%	2.1 yr
Clinic	55	43	₦458m	₦447m	51%	2.1 yr
Industrial Site	52	38	₦260m	₦260m	57%	1.9 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	36,989	9,820	₦36bn	₦35bn

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	36,462	9,409	₦31.9bn	₦31bn	25%	4.4 yr
Enterprise	484	383	₦3.81bn	₦3.74bn	57%	1.9 yr
SME High	43	28	₦242m	₦242m	41%	2.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	12,104	3,975	₦28.8bn	₦28bn
2.0	11,711	3,362	₦4.78bn	₦4.6bn
0.0	5,671	1,261	₦185m	₦185m
4.0	5,670	658	₦1.81bn	₦1.81bn
1.0	1,830	562	₦323m	₦322m
5.0	3	2	₦27.5m	₦27.5m