Akwa Ibom State

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

Eket has 50,574 buildings with a viable rooftop and 1.39 GWp of roof capacity. 40% run a generator, and together they spend ₦35.4bn a year on energy.

Viable buildings

50,574

Usable roof area

6.19 km²

1.39 GWp roof capacity

Energy spend

₦35.4bn/yr

30.1 GWh/yr burned on generators

Median payback

4.6 yr

Median IRR 23% (cash saved)

The savings bracket for Eket

Approach B

Cash saved

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

Current energy spend₦35.4bn/yr

Year-one cash saved₦34.4bn

Lifetime cash saved₦1.84tn

NPV₦266bn

Median IRR23%

Median payback4.6 yr

Unlocked energy30.7 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₦131bn

Year-one energy value₦90.2bn

Lifetime energy value₦4.24tn

NPV₦685bn

Median IRR69%

Median payback1.6 yr

Three ways to size Eket'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: ₦131bn
Year 1 savings: ₦90.2bn/yr
NPV: ₦685bn
Median IRR: 69%
Median payback: 1.6 yr

The odds a rooftop in Eket pays back quickly

Of the 50,432 buildings in Eket with a modelled payback, 74.9% pay back inside five years and 32.1% inside three.

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How much of Eket's demand actually gets met

Buildings in Eket consume 61.9 GWh/yr but want 92.7 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 Eket

Loading band economics…

How many rooftops in Eket 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 50,432 buildings with a modelled result out of 50,574 in Eket. 45,481 clear a positive NPV.

Payback

Under 3 years16,170 (32%)

Under 5 years37,784 (75%)

Under 7 years45,388 (90%)

Under 10 years48,456 (96%)

Return (IRR)

Above 10%48,128 (95%)

Above 15%45,481 (90%)

Above 20%40,211 (80%)

Above 25%20,347 (40%)

CO₂ avoided

65.6 kt/yr

Fuel avoided

16.5 million litres/yr

Energy unlocked

30.7 GWh/yr

Demand that is suppressed today

People served

205k

What hardware costs right now

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

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 Eket

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
B	27,834	7,229	₦7.2bn	₦7.18bn	23%	4.6 yr
C	14,974	8,310	₦17.2bn	₦16.8bn	33%	3.4 yr
D	5,522	3,096	₦7.57bn	₦7.1bn	49%	2.1 yr
E	2,244	1,426	₦3.43bn	₦3.4bn	67%	1.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	48,235	18,558	₦25.5bn	₦25bn	23%	4.6 yr
Commercial General	809	530	₦4.05bn	₦4.04bn	43%	2.4 yr
Worship	807	568	₦1.22bn	₦1.22bn	45%	2.4 yr
Anchor	363	202	₦3.87bn	₦3.54bn	41%	2.6 yr
Commercial Retail	244	153	₦60.6m	₦60.6m	41%	2.6 yr
Hospitality	71	25	₦577m	₦534m	33%	3.4 yr
Industrial	21	16	₦47.3m	₦46.9m	47%	2.1 yr
Mall Retail	12	5	₦24m	₦24m	33%	3.1 yr
Productive Use	9	2	₦5.03m	₦5.03m	33%	3.4 yr
Automotive	2	2	₦7.09m	₦7.09m	39%	1.9 yr
Filling Station	1	0	₦428k	₦428k	33%	3.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	18,998	7,683	₦12.3bn	₦12bn	23%	4.6 yr
50 100m2	9,472	3,697	₦1.67bn	₦1.66bn	23%	4.6 yr
250 1000m2	8,472	3,252	₦17.4bn	₦17bn	25%	4.6 yr
Under 30m2	7,794	3,185	₦314m	₦314m	17%	6.4 yr
30 50m2	5,764	2,211	₦415m	₦412m	19%	5.4 yr
Over 1000m2	74	33	₦3.24bn	₦2.97bn	31%	3.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	44,533	17,189	₦26.9bn	₦26.4bn	23%	4.6 yr
Unclassified	3,165	1,015	₦3.16bn	₦2.85bn	23%	4.6 yr
Urban	1,760	920	₦2.54bn	₦2.53bn	53%	2.1 yr
Dense Urban	745	670	₦1.46bn	₦1.46bn	57%	1.9 yr
Rural	371	267	₦1.28bn	₦1.21bn	69%	1.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Formal	19,783	5,128	₦2.36bn	₦2.36bn	23%	4.6 yr
Residential	11,533	5,851	₦20.3bn	₦19.7bn	47%	2.4 yr
Residential Small	8,682	4,447	₦2.19bn	₦2.17bn	41%	2.4 yr
Shed	4,827	2,342	₦257m	₦257m	21%	5.4 yr
Residential Informal	3,410	790	₦443m	₦443m	23%	4.6 yr
Commercial Corridor	435	333	₦2.16bn	₦2.15bn	53%	1.9 yr
Institutional	386	279	₦3.22bn	₦3.22bn	45%	2.4 yr
Worship Center	311	210	₦231m	₦231m	45%	2.4 yr
Place Of Worship	282	188	₦162m	₦162m	45%	2.4 yr
Kiosk Shop	248	154	₦63.1m	₦63.1m	41%	2.6 yr
School	119	64	₦353m	₦353m	47%	2.4 yr
Unknown	119	59	₦439m	₦439m	31%	3.6 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	50,574	20,061	₦35.4bn	₦34.4bn

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	49,701	19,485	₦28.9bn	₦28.3bn	23%	4.6 yr
SME High	502	364	₦2.61bn	₦2.6bn	53%	2.1 yr
Enterprise	371	212	₦3.88bn	₦3.55bn	41%	2.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	16,587	7,452	₦25.1bn	₦24.3bn
4.0	16,442	4,344	₦6.12bn	₦6.11bn
2.0	10,913	4,996	₦3.33bn	₦3.19bn
0.0	4,829	2,344	₦258m	₦258m
1.0	1,779	911	₦213m	₦213m
5.0	15	10	₦211m	₦211m
6.0	9	4	₦186m	₦179m