Anambra State

Rooftop solar in Ekwusigo, Anambra: what the roofs are worth

Ekwusigo has 51,318 buildings with a viable rooftop and 1.25 GWp of roof capacity. 61% run a generator, and together they spend ₦60.8bn a year on energy.

Viable buildings

51,318

Usable roof area

5.56 km²

1.25 GWp roof capacity

Energy spend

₦60.8bn/yr

57.6 GWh/yr burned on generators

Median payback

2.1 yr

Median IRR 51% (cash saved)

The savings bracket for Ekwusigo

Approach B

Cash saved

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

Current energy spend₦60.8bn/yr

Year-one cash saved₦59.5bn

Lifetime cash saved₦3.11tn

NPV₦481bn

Median IRR51%

Median payback2.1 yr

Unlocked energy43.3 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity168 MWp

Capex₦165bn

Year-one energy value₦132bn

Lifetime energy value₦6.25tn

NPV₦1.04tn

Median IRR85%

Median payback1.1 yr

Three ways to size Ekwusigo'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: 168 MWp
Capital cost: ₦165bn
Year 1 savings: ₦132bn/yr
NPV: ₦1.04tn
Median IRR: 85%
Median payback: 1.1 yr

The odds a rooftop in Ekwusigo pays back quickly

Of the 51,214 buildings in Ekwusigo with a modelled payback, 85.6% pay back inside five years and 58.9% inside three.

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How much of Ekwusigo's demand actually gets met

Buildings in Ekwusigo consume 91 GWh/yr but want 134 GWh/yr. The 32% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Ekwusigo

Loading band economics…

How many rooftops in Ekwusigo 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 51,214 buildings with a modelled result out of 51,318 in Ekwusigo. 47,935 clear a positive NPV.

Payback

Under 3 years30,177 (59%)

Under 5 years43,858 (86%)

Under 7 years47,911 (94%)

Under 10 years49,595 (97%)

Return (IRR)

Above 10%49,245 (96%)

Above 15%47,935 (93%)

Above 20%45,026 (88%)

Above 25%38,737 (75%)

CO₂ avoided

105 kt/yr

Fuel avoided

30.5 million litres/yr

Energy unlocked

43.3 GWh/yr

Demand that is suppressed today

People served

229k

What hardware costs right now

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

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 Ekwusigo

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
C	27,382	17,173	₦34.4bn	₦33.6bn	51%	2.1 yr
B	9,038	4,978	₦7.24bn	₦7.17bn	41%	2.6 yr
D	6,152	3,979	₦10.5bn	₦10.3bn	71%	1.4 yr
E	5,463	3,763	₦6.29bn	₦6.14bn	71%	1.4 yr
A	3,283	1,355	₦2.33bn	₦2.32bn	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	47,922	28,389	₦41.9bn	₦40.8bn	51%	2.1 yr
Commercial General	1,911	1,606	₦10.6bn	₦10.6bn	49%	2.1 yr
Commercial Retail	883	765	₦301m	₦301m	47%	2.4 yr
Anchor	318	260	₦7.12bn	₦6.88bn	55%	1.9 yr
Worship	164	139	₦367m	₦367m	55%	1.9 yr
Industrial	103	79	₦411m	₦411m	61%	1.6 yr
Hospitality	9	5	₦35.5m	₦35.5m	35%	3.1 yr
Filling Station	8	5	₦18.5m	₦18.5m	39%	2.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	18,679	11,229	₦22.2bn	₦22.1bn	51%	2.1 yr
50 100m2	11,265	6,724	₦3.5bn	₦3.41bn	49%	2.1 yr
Under 30m2	8,199	5,032	₦572m	₦571m	47%	2.4 yr
30 50m2	6,721	4,149	₦859m	₦859m	51%	2.1 yr
250 1000m2	6,375	4,045	₦26.6bn	₦25.8bn	53%	1.9 yr
Over 1000m2	79	69	₦6.99bn	₦6.72bn	61%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	47,763	29,203	₦55.2bn	₦54.1bn	49%	2.1 yr
Unclassified	2,407	1,291	₦2.89bn	₦2.68bn	45%	2.4 yr
Urban	1,148	754	₦2.72bn	₦2.72bn	69%	1.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	14,890	9,691	₦4.88bn	₦4.68bn	59%	1.9 yr
Residential	14,598	9,456	₦33.5bn	₦32.7bn	61%	1.9 yr
Residential Formal	7,809	3,445	₦2.24bn	₦2.24bn	25%	4.4 yr
Shed	7,695	4,779	₦502m	₦502m	57%	1.9 yr
Commercial	1,396	1,166	₦7.8bn	₦7.76bn	49%	2.1 yr
Apartment	1,259	576	₦342m	₦342m	25%	4.4 yr
Residential Informal	1,228	210	₦265m	₦265m	25%	4.4 yr
Kiosk Shop	883	765	₦301m	₦301m	47%	2.4 yr
Duplex	403	214	₦131m	₦131m	31%	3.4 yr
Institutional	297	244	₦5.43bn	₦5.43bn	51%	2.1 yr
Commercial Corridor	171	169	₦1.42bn	₦1.42bn	49%	2.1 yr
Unknown	97	69	₦335m	₦335m	45%	2.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	51,318	31,248	₦60.8bn	₦59.5bn

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	49,333	29,579	₦44.1bn	₦43bn	51%	2.1 yr
SME High	1,579	1,344	₦9.27bn	₦9.22bn	49%	2.1 yr
Enterprise	406	325	₦7.46bn	₦7.22bn	55%	1.9 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	25,930	16,701	₦45.8bn	₦44.6bn
4.0	9,810	4,421	₦7.13bn	₦7.09bn
0.0	7,728	4,791	₦506m	₦506m
2.0	6,101	3,952	₦1.72bn	₦1.67bn
5.0	856	694	₦2.27bn	₦2.27bn
1.0	594	441	₦155m	₦154m
6.0	299	248	₦3.2bn	₦3.2bn