Anambra State

Rooftop solar in Idemili South, Anambra: what the roofs are worth

Idemili South has 79,895 buildings with a viable rooftop and 1.87 GWp of roof capacity. 49% run a generator, and together they spend ₦66.2bn a year on energy.

Viable buildings

79,895

Usable roof area

8.32 km²

1.87 GWp roof capacity

Energy spend

₦66.2bn/yr

54.7 GWh/yr burned on generators

Median payback

4.1 yr

Median IRR 27% (cash saved)

The savings bracket for Idemili South

Approach B

Cash saved

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

Current energy spend₦66.2bn/yr

Year-one cash saved₦65.8bn

Lifetime cash saved₦3.44tn

NPV₦514bn

Median IRR27%

Median payback4.1 yr

Unlocked energy45.4 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity193 MWp

Capex₦197bn

Year-one energy value₦147bn

Lifetime energy value₦6.96tn

NPV₦1.14tn

Median IRR83%

Median payback1.4 yr

Three ways to size Idemili South'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: 193 MWp
Capital cost: ₦197bn
Year 1 savings: ₦147bn/yr
NPV: ₦1.14tn
Median IRR: 83%
Median payback: 1.4 yr

The odds a rooftop in Idemili South pays back quickly

Of the 79,655 buildings in Idemili South with a modelled payback, 78.1% pay back inside five years and 44.9% inside three.

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How much of Idemili South's demand actually gets met

Buildings in Idemili South consume 105 GWh/yr but want 151 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 Idemili South

Loading band economics…

How many rooftops in Idemili South 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 79,655 buildings with a modelled result out of 79,895 in Idemili South. 72,041 clear a positive NPV.

Payback

Under 3 years35,789 (45%)

Under 5 years62,205 (78%)

Under 7 years71,977 (90%)

Under 10 years76,195 (96%)

Return (IRR)

Above 10%75,561 (95%)

Above 15%72,041 (90%)

Above 20%65,266 (82%)

Above 25%53,012 (66%)

CO₂ avoided

120 kt/yr

Fuel avoided

33.8 million litres/yr

Energy unlocked

45.4 GWh/yr

Demand that is suppressed today

People served

298k

What hardware costs right now

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

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 Idemili South

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
A	23,587	12,513	₦24bn	₦23.8bn	33%	3.1 yr
B	20,165	11,471	₦20.9bn	₦20.8bn	33%	3.1 yr
C	19,466	8,428	₦9.99bn	₦9.98bn	25%	4.4 yr
E	8,559	2,655	₦5.15bn	₦5.11bn	25%	4.4 yr
D	8,118	4,296	₦6.15bn	₦6.15bn	45%	2.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	77,704	38,149	₦54.7bn	₦54.6bn	25%	4.1 yr
Commercial General	1,055	558	₦4.75bn	₦4.74bn	35%	2.9 yr
Anchor	381	273	₦4.81bn	₦4.55bn	51%	2.1 yr
Commercial Retail	274	45	₦39.1m	₦39.1m	33%	3.4 yr
Worship	229	170	₦188m	₦188m	47%	2.4 yr
Industrial	180	123	₦1.32bn	₦1.31bn	51%	2.1 yr
Filling Station	42	24	₦67.2m	₦67m	47%	2.4 yr
Hospitality	28	21	₦312m	₦309m	41%	2.6 yr
Mall Retail	2	0	₦335k	₦335k	31%	3.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	26,885	13,359	₦23.9bn	₦23.9bn	29%	3.9 yr
50 100m2	18,341	8,805	₦3.92bn	₦3.92bn	25%	4.4 yr
Under 30m2	13,785	6,607	₦647m	₦646m	21%	5.1 yr
30 50m2	10,836	5,184	₦956m	₦955m	25%	4.4 yr
250 1000m2	9,942	5,330	₦31.6bn	₦31.4bn	37%	2.9 yr
Over 1000m2	106	78	₦5.12bn	₦4.96bn	51%	2.1 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	76,763	37,694	₦63.3bn	₦62.8bn	27%	4.1 yr
Unclassified	3,118	1,669	₦2.95bn	₦2.95bn	35%	3.1 yr
Urban	14	0	₦1.17m	₦1.17m	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	17,801	8,649	₦4.81bn	₦4.81bn	25%	4.4 yr
Residential Formal	17,598	7,369	₦7.32bn	₦7.32bn	25%	4.4 yr
Residential	15,637	8,155	₦34.5bn	₦34.3bn	49%	2.1 yr
Residential Informal	13,722	7,360	₦6.45bn	₦6.45bn	29%	3.6 yr
Shed	10,307	5,402	₦557m	₦557m	39%	2.9 yr
Apartment	1,716	789	₦768m	₦768m	25%	4.4 yr
Duplex	841	378	₦346m	₦346m	25%	4.4 yr
Institutional	417	295	₦3.92bn	₦3.76bn	43%	2.6 yr
Commercial	290	224	₦2.75bn	₦2.75bn	49%	2.1 yr
Commercial Corridor	276	0	₦416m	₦416m	35%	3.1 yr
Kiosk Shop	273	45	₦38.1m	₦38.1m	33%	3.4 yr
Industrial Site	154	109	₦1.27bn	₦1.27bn	53%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	79,893	39,361	₦66.2bn	₦65.8bn
Farmyard	2	2	₦5.36m	₦5.36m

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	78,718	38,711	₦56.8bn	₦56.7bn	25%	4.1 yr
SME High	617	257	₦3.27bn	₦3.27bn	35%	3.1 yr
Enterprise	560	395	₦6.12bn	₦5.85bn	51%	2.1 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	32,321	16,373	₦41.3bn	₦41.1bn
4.0	25,086	11,780	₦19.9bn	₦19.6bn
2.0	10,517	5,068	₦1.98bn	₦1.98bn
0.0	10,361	5,425	₦571m	₦571m
1.0	1,209	592	₦72.7m	₦72.7m
5.0	252	30	₦411m	₦411m
6.0	149	95	₦1.97bn	₦1.97bn