Akwa Ibom State

Rooftop solar in Onna, Akwa Ibom: what the roofs are worth

Onna has 15,110 buildings with a viable rooftop and 420 MWp of roof capacity. 80% run a generator, and together they spend ₦53.6bn a year on energy.

Viable buildings

15,110

Usable roof area

1.86 km²

420 MWp roof capacity

Energy spend

₦53.6bn/yr

49.9 GWh/yr burned on generators

Median payback

1.6 yr

Median IRR 67% (cash saved)

The savings bracket for Onna

Approach B

Cash saved

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

Current energy spend₦53.6bn/yr

Year-one cash saved₦52.5bn

Lifetime cash saved₦2.67tn

NPV₦418bn

Median IRR67%

Median payback1.6 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 capacity114 MWp

Capex₦116bn

Year-one energy value₦97.3bn

Lifetime energy value₦4.59tn

NPV₦768bn

Median IRR93%

Median payback1.1 yr

Three ways to size Onna'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: 114 MWp
Capital cost: ₦116bn
Year 1 savings: ₦97.3bn/yr
NPV: ₦768bn
Median IRR: 93%
Median payback: 1.1 yr

The odds a rooftop in Onna pays back quickly

Of the 15,109 buildings in Onna with a modelled payback, 94.7% pay back inside five years and 79.7% inside three.

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How much of Onna's demand actually gets met

Buildings in Onna consume 64.6 GWh/yr but want 89.1 GWh/yr. The 28% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Onna

Loading band economics…

How many rooftops in Onna 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 15,109 buildings with a modelled result out of 15,110 in Onna. 14,577 clear a positive NPV.

Payback

Under 3 years12,048 (80%)

Under 5 years14,311 (95%)

Under 7 years14,577 (96%)

Under 10 years14,787 (98%)

Return (IRR)

Above 10%14,712 (97%)

Above 15%14,577 (96%)

Above 20%14,367 (95%)

Above 25%12,059 (80%)

CO₂ avoided

87.6 kt/yr

Fuel avoided

30.3 million litres/yr

Energy unlocked

24.6 GWh/yr

Demand that is suppressed today

People served

185k

What hardware costs right now

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

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 Onna

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
E	6,634	5,285	₦25.8bn	₦25.1bn	67%	1.6 yr
D	5,985	4,750	₦19bn	₦18.9bn	67%	1.6 yr
C	2,470	1,993	₦8.46bn	₦8.23bn	55%	1.9 yr
B	21	21	₦338m	₦338m	59%	1.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	14,211	11,158	₦45.6bn	₦44.8bn	67%	1.6 yr
Worship	407	404	₦1.16bn	₦1.16bn	59%	1.9 yr
Commercial General	279	276	₦3.32bn	₦3.3bn	63%	1.6 yr
Anchor	145	143	₦3.41bn	₦3.15bn	75%	1.4 yr
Commercial Retail	52	52	₦41.3m	₦41.3m	61%	1.6 yr
Industrial	16	16	₦107m	₦106m	71%	1.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	6,118	4,860	₦20.8bn	₦20.4bn	67%	1.6 yr
50 100m2	3,310	2,606	₦2.75bn	₦2.75bn	67%	1.6 yr
250 1000m2	2,377	2,002	₦27.3bn	₦26.6bn	69%	1.6 yr
30 50m2	1,645	1,292	₦480m	₦480m	65%	1.6 yr
Under 30m2	1,644	1,274	₦235m	₦232m	63%	1.6 yr
Over 1000m2	16	15	₦2.1bn	₦2.1bn	61%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Dense Urban	6,315	5,449	₦21.3bn	₦21.2bn	67%	1.6 yr
Urban	4,588	3,762	₦19.8bn	₦19.3bn	67%	1.6 yr
Unclassified	2,977	1,917	₦8.18bn	₦7.74bn	63%	1.6 yr
Rural	1,230	921	₦4.37bn	₦4.24bn	67%	1.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	6,565	5,232	₦40.8bn	₦40bn	69%	1.6 yr
Residential Small	5,457	4,346	₦4.61bn	₦4.6bn	67%	1.6 yr
Shed	2,189	1,580	₦213m	₦213m	63%	1.6 yr
Institutional	227	225	₦2.92bn	₦2.92bn	57%	1.9 yr
Commercial Corridor	148	148	₦1.94bn	₦1.92bn	65%	1.6 yr
Worship Center	143	142	₦226m	₦226m	63%	1.6 yr
Place Of Worship	128	127	₦131m	₦131m	63%	1.6 yr
Educational Facility	60	59	₦653m	₦653m	79%	1.4 yr
Kiosk Shop	52	52	₦41.3m	₦41.3m	61%	1.6 yr
School	41	40	₦223m	₦223m	77%	1.4 yr
Healthcare Facility	25	25	₦1.24bn	₦1.01bn	57%	1.9 yr
Industrial Site	16	16	₦107m	₦106m	71%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	15,110	12,049	₦53.6bn	₦52.5bn

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	14,789	11,732	₦48bn	₦47.2bn	67%	1.6 yr
SME High	161	159	₦2.14bn	₦2.12bn	65%	1.6 yr
Enterprise	160	158	₦3.52bn	₦3.26bn	73%	1.4 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	6,685	5,517	₦45.7bn	₦44.8bn
2.0	5,629	4,432	₦5.55bn	₦5.44bn
0.0	2,189	1,580	₦213m	₦213m
1.0	506	421	₦181m	₦181m
4.0	97	95	₦1.69bn	₦1.67bn
5.0	4	4	₦242m	₦236m