Anambra State

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

Njikoka has 37,906 buildings with a viable rooftop and 847 MWp of roof capacity. 33% run a generator, and together they spend ₦12.7bn a year on energy.

Viable buildings

37,906

Usable roof area

3.77 km²

847 MWp roof capacity

Energy spend

₦12.7bn/yr

9.57 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Njikoka

Approach B

Cash saved

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

Current energy spend₦12.7bn/yr

Year-one cash saved₦12.6bn

Lifetime cash saved₦703bn

NPV₦98.3bn

Median IRR25%

Median payback4.4 yr

Unlocked energy16.7 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity63.8 MWp

Capex₦64.2bn

Year-one energy value₦44.6bn

Lifetime energy value₦2.1tn

NPV₦340bn

Median IRR81%

Median payback1.4 yr

Three ways to size Njikoka'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: 63.8 MWp
Capital cost: ₦64.2bn
Year 1 savings: ₦44.6bn/yr
NPV: ₦340bn
Median IRR: 81%
Median payback: 1.4 yr

The odds a rooftop in Njikoka pays back quickly

Of the 37,756 buildings in Njikoka with a modelled payback, 73.1% pay back inside five years and 24.6% inside three.

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How much of Njikoka's demand actually gets met

Buildings in Njikoka consume 28.2 GWh/yr but want 44.9 GWh/yr. The 37% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Njikoka

Loading band economics…

How many rooftops in Njikoka 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 37,756 buildings with a modelled result out of 37,906 in Njikoka. 34,372 clear a positive NPV.

Payback

Under 3 years9,306 (25%)

Under 5 years27,592 (73%)

Under 7 years34,322 (91%)

Under 10 years36,522 (97%)

Return (IRR)

Above 10%36,297 (96%)

Above 15%34,372 (91%)

Above 20%29,597 (78%)

Above 25%18,861 (50%)

CO₂ avoided

27.2 kt/yr

Fuel avoided

5.06 million litres/yr

Energy unlocked

16.7 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 Njikoka.

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 Njikoka

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
A	19,143	6,633	₦5.35bn	₦5.32bn	25%	4.4 yr
B	14,477	4,625	₦5.84bn	₦5.79bn	25%	4.4 yr
C	4,253	1,153	₦1.47bn	₦1.47bn	25%	4.4 yr
D	21	1	₦52.1m	₦50.1m	9%	9.6 yr
E	12	5	₦770k	₦770k	5%	14.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	36,869	11,705	₦8.34bn	₦8.31bn	25%	4.4 yr
Commercial General	575	383	₦2.68bn	₦2.66bn	39%	2.9 yr
Anchor	221	161	₦1.44bn	₦1.4bn	43%	2.6 yr
Commercial Retail	109	68	₦21.8m	₦21.8m	37%	2.9 yr
Worship	66	49	₦58.7m	₦58.7m	37%	2.9 yr
Industrial	42	31	₦80.6m	₦80.6m	45%	2.4 yr
Filling Station	15	13	₦30.8m	₦30.8m	45%	2.4 yr
Hospitality	6	5	₦59.2m	₦59.2m	37%	2.6 yr
Productive Use	2	1	₦387k	₦387k	33%	2.6 yr
Mall Retail	1	1	₦536k	₦536k	53%	2.1 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	14,146	4,546	₦4.21bn	₦4.2bn	25%	4.4 yr
50 100m2	8,163	2,471	₦627m	₦627m	25%	4.4 yr
Under 30m2	6,829	2,187	₦153m	₦153m	17%	6.1 yr
30 50m2	4,986	1,628	₦197m	₦197m	21%	5.4 yr
250 1000m2	3,736	1,561	₦6.42bn	₦6.38bn	25%	4.4 yr
Over 1000m2	46	24	₦1.11bn	₦1.06bn	35%	2.9 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	31,432	9,404	₦8.93bn	₦8.87bn	25%	4.4 yr
Dense Urban	4,375	1,948	₦1.37bn	₦1.37bn	25%	4.4 yr
Unclassified	1,220	398	₦1.15bn	₦1.13bn	25%	4.4 yr
Urban	879	667	₦1.26bn	₦1.26bn	57%	1.9 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Formal	10,075	2,258	₦806m	₦806m	25%	4.4 yr
Residential Small	8,898	3,119	₦757m	₦757m	25%	4.4 yr
Residential	7,460	3,061	₦6bn	₦5.98bn	25%	4.4 yr
Residential Informal	4,723	1,572	₦501m	₦501m	25%	4.4 yr
Shed	3,611	1,277	₦112m	₦112m	19%	5.6 yr
Apartment	1,775	331	₦133m	₦133m	25%	4.4 yr
Duplex	314	85	₦27.7m	₦27.7m	25%	4.4 yr
Commercial	227	174	₦1.86bn	₦1.84bn	47%	2.4 yr
Unknown	170	84	₦287m	₦287m	31%	3.4 yr
Institutional	168	126	₦923m	₦893m	39%	2.9 yr
Kiosk Shop	110	69	₦22m	₦22m	37%	2.9 yr
Educational Facility	56	39	₦160m	₦160m	51%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	37,906	12,417	₦12.7bn	₦12.6bn

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	37,373	12,023	₦9.19bn	₦9.16bn	25%	4.4 yr
SME High	270	202	₦2.01bn	₦1.98bn	47%	2.4 yr
Enterprise	263	192	₦1.52bn	₦1.48bn	43%	2.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	15,600	5,640	₦7.69bn	₦7.65bn
4.0	14,652	3,848	₦3.46bn	₦3.43bn
0.0	3,619	1,279	₦112m	₦112m
2.0	3,500	1,376	₦248m	₦248m
1.0	442	205	₦14.4m	₦14.4m
5.0	49	34	₦225m	₦225m
6.0	44	35	₦967m	₦944m