Akwa Ibom State

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

Okobo has 17,110 buildings with a viable rooftop and 433 MWp of roof capacity. 66% run a generator, and together they spend ₦32.1bn a year on energy.

Viable buildings

17,110

Usable roof area

1.93 km²

433 MWp roof capacity

Energy spend

₦32.1bn/yr

30 GWh/yr burned on generators

Median payback

1.6 yr

Median IRR 65% (cash saved)

The savings bracket for Okobo

Approach B

Cash saved

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

Current energy spend₦32.1bn/yr

Year-one cash saved₦31.6bn

Lifetime cash saved₦1.6tn

NPV₦253bn

Median IRR65%

Median payback1.6 yr

Unlocked energy15.4 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity78.1 MWp

Capex₦81.1bn

Year-one energy value₦71bn

Lifetime energy value₦3.37tn

NPV₦566bn

Median IRR95%

Median payback1.1 yr

Three ways to size Okobo'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: 78.1 MWp
Capital cost: ₦81.1bn
Year 1 savings: ₦71bn/yr
NPV: ₦566bn
Median IRR: 95%
Median payback: 1.1 yr

The odds a rooftop in Okobo pays back quickly

Of the 17,090 buildings in Okobo with a modelled payback, 86.7% pay back inside five years and 65.9% inside three.

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How much of Okobo's demand actually gets met

Buildings in Okobo consume 36.6 GWh/yr but want 52 GWh/yr. The 30% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Okobo

Loading band economics…

How many rooftops in Okobo 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 17,090 buildings with a modelled result out of 17,110 in Okobo. 15,428 clear a positive NPV.

Payback

Under 3 years11,255 (66%)

Under 5 years14,812 (87%)

Under 7 years15,421 (90%)

Under 10 years15,798 (92%)

Return (IRR)

Above 10%15,671 (92%)

Above 15%15,428 (90%)

Above 20%15,101 (88%)

Above 25%11,300 (66%)

CO₂ avoided

52.9 kt/yr

Fuel avoided

18.6 million litres/yr

Energy unlocked

15.4 GWh/yr

Demand that is suppressed today

People served

149k

What hardware costs right now

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

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 Okobo

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
E	12,716	8,313	₦25.2bn	₦24.7bn	67%	1.6 yr
D	4,394	2,945	₦6.89bn	₦6.89bn	63%	1.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	16,505	10,699	₦27.9bn	₦27.5bn	67%	1.6 yr
Worship	316	273	₦740m	₦740m	59%	1.9 yr
Commercial General	139	138	₦1.38bn	₦1.33bn	59%	1.9 yr
Anchor	119	118	₦1.94bn	₦1.75bn	77%	1.4 yr
Industrial	31	30	₦222m	₦219m	71%	1.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	6,289	3,934	₦11.2bn	₦11bn	67%	1.6 yr
50 100m2	3,204	1,982	₦1.43bn	₦1.43bn	65%	1.6 yr
Under 30m2	3,112	2,070	₦308m	₦304m	63%	1.6 yr
250 1000m2	2,437	1,891	₦17.6bn	₦17.3bn	69%	1.6 yr
30 50m2	2,053	1,369	₦370m	₦370m	65%	1.6 yr
Over 1000m2	15	12	₦1.2bn	₦1.16bn	69%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	8,631	5,742	₦16.8bn	₦16.5bn	67%	1.6 yr
Dense Urban	4,674	4,492	₦11.5bn	₦11.3bn	67%	1.6 yr
Unclassified	2,492	774	₦2.96bn	₦2.96bn	23%	4.6 yr
Rural	1,313	250	₦885m	₦843m	23%	4.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	6,780	4,419	₦24.7bn	₦24.4bn	69%	1.6 yr
Residential Small	5,635	3,732	₦2.39bn	₦2.39bn	67%	1.6 yr
Shed	3,404	1,927	₦238m	₦238m	63%	1.6 yr
Residential Formal	686	621	₦550m	₦550m	55%	1.9 yr
Institutional	203	190	₦1.76bn	₦1.76bn	57%	1.9 yr
Worship Center	123	102	₦118m	₦118m	61%	1.6 yr
Place Of Worship	89	80	₦77.4m	₦77.4m	63%	1.6 yr
Educational Facility	55	54	₦505m	₦505m	81%	1.4 yr
Industrial Site	31	30	₦222m	₦219m	71%	1.4 yr
Market	28	28	₦40m	₦40m	63%	1.6 yr
School	26	26	₦104m	₦104m	79%	1.4 yr
Healthcare Facility	18	18	₦547m	₦453m	55%	1.9 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	17,110	11,258	₦32.1bn	₦31.6bn

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	16,951	11,102	₦29.5bn	₦29.2bn	65%	1.6 yr
Enterprise	150	148	₦2.16bn	₦1.97bn	75%	1.4 yr
SME High	9	8	₦484m	₦431m	75%	1.4 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	6,461	4,600	₦26.9bn	₦26.5bn
2.0	5,695	3,536	₦3.65bn	₦3.53bn
0.0	3,406	1,928	₦238m	₦238m
1.0	1,025	718	₦249m	₦249m
4.0	521	474	₦811m	₦806m
5.0	2	2	₦287m	₦239m