Anambra State

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

Nnewi South has 96,092 buildings with a viable rooftop and 2.26 GWp of roof capacity. 51% run a generator, and together they spend ₦69.2bn a year on energy.

Viable buildings

96,092

Usable roof area

10.1 km²

2.26 GWp roof capacity

Energy spend

₦69.2bn/yr

66.1 GWh/yr burned on generators

Median payback

2.4 yr

Median IRR 43% (cash saved)

The savings bracket for Nnewi South

Approach B

Cash saved

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

Current energy spend₦69.2bn/yr

Year-one cash saved₦69bn

Lifetime cash saved₦3.53tn

NPV₦560bn

Median IRR43%

Median payback2.4 yr

Unlocked energy48.3 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity217 MWp

Capex₦224bn

Year-one energy value₦197bn

Lifetime energy value₦9.41tn

NPV₦1.58tn

Median IRR99%

Median payback1.1 yr

Three ways to size Nnewi 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: 217 MWp
Capital cost: ₦224bn
Year 1 savings: ₦197bn/yr
NPV: ₦1.58tn
Median IRR: 99%
Median payback: 1.1 yr

The odds a rooftop in Nnewi South pays back quickly

Of the 95,817 buildings in Nnewi South with a modelled payback, 73.8% pay back inside five years and 50.9% inside three.

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How much of Nnewi South's demand actually gets met

Buildings in Nnewi South consume 89.1 GWh/yr but want 137 GWh/yr. The 35% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Nnewi South

Loading band economics…

How many rooftops in Nnewi 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 95,817 buildings with a modelled result out of 96,092 in Nnewi South. 81,654 clear a positive NPV.

Payback

Under 3 years48,737 (51%)

Under 5 years70,666 (74%)

Under 7 years81,565 (85%)

Under 10 years87,998 (92%)

Return (IRR)

Above 10%86,544 (90%)

Above 15%81,654 (85%)

Above 20%74,005 (77%)

Above 25%53,215 (55%)

CO₂ avoided

121 kt/yr

Fuel avoided

38.3 million litres/yr

Energy unlocked

48.3 GWh/yr

Demand that is suppressed today

People served

410k

What hardware costs right now

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

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
E	36,091	18,554	₦24.9bn	₦24.9bn	53%	1.9 yr
D	31,906	14,206	₦18.4bn	₦18.4bn	25%	4.4 yr
C	21,579	11,981	₦18.9bn	₦18.8bn	53%	2.1 yr
B	5,836	3,659	₦6.5bn	₦6.4bn	47%	2.4 yr
A	680	620	₦521m	₦521m	45%	2.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	93,421	46,625	₦54.2bn	₦54.2bn	25%	3.6 yr
Commercial General	1,086	956	₦5.28bn	₦5.27bn	59%	1.9 yr
Industrial	603	524	₦3.18bn	₦3.13bn	71%	1.4 yr
Anchor	480	446	₦5.58bn	₦5.43bn	73%	1.4 yr
Worship	311	288	₦786m	₦786m	61%	1.6 yr
Commercial Retail	161	153	₦52.4m	₦52.4m	63%	1.6 yr
Filling Station	20	18	₦63.9m	₦63.9m	67%	1.6 yr
Hospitality	10	10	₦75.9m	₦75.9m	53%	1.9 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	31,878	15,812	₦23.3bn	₦23.3bn	27%	4.1 yr
50 100m2	22,425	11,393	₦4.67bn	₦4.67bn	43%	2.6 yr
Under 30m2	16,309	8,272	₦898m	₦893m	35%	2.6 yr
30 50m2	13,080	6,665	₦1.29bn	₦1.29bn	43%	2.6 yr
250 1000m2	12,297	6,806	₦34.3bn	₦34.2bn	57%	1.9 yr
Over 1000m2	103	72	₦4.79bn	₦4.68bn	63%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	88,379	46,117	₦66bn	₦65.7bn	47%	2.1 yr
Unclassified	3,687	1,849	₦1.79bn	₦1.79bn	35%	2.9 yr
Urban	2,863	687	₦970m	₦970m	25%	4.4 yr
Dense Urban	1,163	367	₦469m	₦469m	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	37,886	19,391	₦6.7bn	₦6.7bn	49%	2.1 yr
Residential	32,519	16,351	₦44.8bn	₦44.8bn	49%	2.1 yr
Shed	17,969	8,279	₦844m	₦844m	17%	6.4 yr
Residential Formal	2,778	986	₦567m	₦567m	25%	4.4 yr
Residential Informal	1,653	1,303	₦1.1bn	₦1.1bn	45%	2.4 yr
Institutional	879	784	₦4.95bn	₦4.9bn	57%	1.9 yr
Industrial Site	535	465	₦2.94bn	₦2.89bn	71%	1.4 yr
Agricultural	379	193	₦83.9m	₦83.9m	57%	1.9 yr
Commercial	194	151	₦1.63bn	₦1.63bn	67%	1.6 yr
Apartment	169	96	₦54.1m	₦54.1m	37%	2.9 yr
Kiosk Shop	161	153	₦52.4m	₦52.4m	63%	1.6 yr
Educational Facility	143	133	₦751m	₦751m	83%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	96,084	49,020	₦69.2bn	₦69bn
Farmyard	7	0	₦262k	₦262k
Farmland	1	0	₦2.69k	₦2.69k

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	94,691	47,776	₦58.3bn	₦58.2bn	37%	2.6 yr
Enterprise	1,073	961	₦8.74bn	₦8.54bn	71%	1.4 yr
SME High	328	283	₦2.22bn	₦2.22bn	67%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	53,135	27,393	₦60.3bn	₦60bn
2.0	18,982	10,111	₦3.69bn	₦3.68bn
0.0	18,346	8,472	₦928m	₦928m
4.0	3,553	1,780	₦3.93bn	₦3.93bn
1.0	2,066	1,255	₦167m	₦167m
5.0	10	9	₦233m	₦232m