Edo State

Rooftop solar in Iguegben, Edo: what the roofs are worth

Iguegben has 20,807 buildings with a viable rooftop and 527 MWp of roof capacity. 30% run a generator, and together they spend ₦13.5bn a year on energy.

Viable buildings

20,807

Usable roof area

2.34 km²

527 MWp roof capacity

Energy spend

₦13.5bn/yr

12.1 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Iguegben

Approach B

Cash saved

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

Current energy spend₦13.5bn/yr

Year-one cash saved₦13.5bn

Lifetime cash saved₦707bn

NPV₦111bn

Median IRR25%

Median payback4.4 yr

Unlocked energy10.6 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity52 MWp

Capex₦53.7bn

Year-one energy value₦48.2bn

Lifetime energy value₦2.29tn

NPV₦386bn

Median IRR99%

Median payback1.1 yr

Three ways to size Iguegben'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: 52 MWp
Capital cost: ₦53.7bn
Year 1 savings: ₦48.2bn/yr
NPV: ₦386bn
Median IRR: 99%
Median payback: 1.1 yr

The odds a rooftop in Iguegben pays back quickly

Of the 20,408 buildings in Iguegben with a modelled payback, 65.5% pay back inside five years and 30.2% inside three.

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How much of Iguegben's demand actually gets met

Buildings in Iguegben consume 18.6 GWh/yr but want 29.1 GWh/yr. The 36% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Iguegben

Loading band economics…

How many rooftops in Iguegben 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 20,408 buildings with a modelled result out of 20,807 in Iguegben. 16,279 clear a positive NPV.

Payback

Under 3 years6,157 (30%)

Under 5 years13,367 (65%)

Under 7 years16,260 (80%)

Under 10 years17,919 (88%)

Return (IRR)

Above 10%17,568 (84%)

Above 15%16,279 (78%)

Above 20%14,189 (68%)

Above 25%10,995 (53%)

CO₂ avoided

24.6 kt/yr

Fuel avoided

7.37 million litres/yr

Energy unlocked

10.6 GWh/yr

Demand that is suppressed today

People served

109k

What hardware costs right now

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

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 Iguegben

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
E	13,800	5,413	₦11.9bn	₦11.9bn	25%	4.4 yr
D	6,519	709	₦1.42bn	₦1.42bn	25%	4.4 yr
C	488	47	₦166m	₦166m	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	20,403	5,838	₦11.2bn	₦11.2bn	25%	4.4 yr
Commercial General	204	165	₦1.2bn	₦1.2bn	55%	1.9 yr
Anchor	140	116	₦1.12bn	₦1.12bn	67%	1.6 yr
Commercial Retail	43	39	₦7.69m	₦7.69m	51%	2.1 yr
Worship	13	8	₦16.4m	₦16.4m	43%	2.4 yr
Industrial	4	3	₦8.72m	₦8.38m	55%	1.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	9,226	2,679	₦6.27bn	₦6.27bn	25%	4.4 yr
Under 30m2	3,882	1,157	₦150m	₦149m	9%	8.4 yr
50 100m2	3,218	975	₦610m	₦610m	23%	4.9 yr
250 1000m2	2,436	717	₦6.08bn	₦6.07bn	25%	4.4 yr
30 50m2	2,026	634	₦146m	₦146m	17%	6.1 yr
Over 1000m2	19	7	₦258m	₦258m	27%	4.1 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	7,106	987	₦2.29bn	₦2.29bn	25%	4.4 yr
Urban	4,668	1,727	₦3.73bn	₦3.73bn	25%	4.4 yr
Dense Urban	4,579	1,310	₦2.02bn	₦2.02bn	25%	4.4 yr
Rural	2,855	1,819	₦4.5bn	₦4.5bn	73%	1.4 yr
Unclassified	1,599	326	₦969m	₦963m	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	8,279	2,616	₦9.74bn	₦9.73bn	25%	4.4 yr
Residential Small	5,143	1,911	₦1.14bn	₦1.14bn	25%	4.4 yr
Shed	4,020	1,230	₦154m	₦154m	11%	8.6 yr
Residential Formal	2,158	68	₦106m	₦106m	23%	4.4 yr
Residential Informal	618	0	₦17m	₦17m	21%	4.9 yr
Apartment	120	12	₦6.59m	₦6.59m	25%	4.4 yr
Commercial Corridor	108	87	₦311m	₦311m	53%	2.1 yr
Institutional	82	67	₦787m	₦787m	59%	1.9 yr
Duplex	65	1	₦3.26m	₦3.26m	25%	4.4 yr
Educational Facility	51	42	₦303m	₦303m	85%	1.1 yr
Kiosk Shop	43	39	₦7.69m	₦7.69m	51%	2.1 yr
School	37	31	₦162m	₦162m	83%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	20,807	6,169	₦13.5bn	₦13.5bn

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	20,545	5,954	₦11.9bn	₦11.9bn	25%	4.4 yr
Enterprise	144	119	₦1.13bn	₦1.13bn	67%	1.6 yr
SME High	118	96	₦477m	₦477m	53%	2.1 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	9,088	2,851	₦11.1bn	₦11.1bn
2.0	4,772	1,675	₦1.52bn	₦1.52bn
0.0	4,018	1,230	₦154m	₦154m
4.0	2,264	144	₦640m	₦640m
1.0	663	268	₦77.8m	₦77.8m
5.0	2	1	₦19.9m	₦19.9m