Anambra State

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

Ihiala has 121,337 buildings with a viable rooftop and 3.02 GWp of roof capacity. 60% run a generator, and together they spend ₦135bn a year on energy.

Viable buildings

121,337

Usable roof area

13.4 km²

3.02 GWp roof capacity

Energy spend

₦135bn/yr

134 GWh/yr burned on generators

Median payback

1.9 yr

Median IRR 57% (cash saved)

The savings bracket for Ihiala

Approach B

Cash saved

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

Current energy spend₦135bn/yr

Year-one cash saved₦133bn

Lifetime cash saved₦6.89tn

NPV₦1.08tn

Median IRR57%

Median payback1.9 yr

Unlocked energy92.7 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity378 MWp

Capex₦368bn

Year-one energy value₦311bn

Lifetime energy value₦14.7tn

NPV₦2.46tn

Median IRR99%

Median payback1.1 yr

Three ways to size Ihiala'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: 378 MWp
Capital cost: ₦368bn
Year 1 savings: ₦311bn/yr
NPV: ₦2.46tn
Median IRR: 99%
Median payback: 1.1 yr

The odds a rooftop in Ihiala pays back quickly

Of the 121,011 buildings in Ihiala with a modelled payback, 79.9% pay back inside five years and 59.4% inside three.

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How much of Ihiala's demand actually gets met

Buildings in Ihiala consume 192 GWh/yr but want 285 GWh/yr. The 33% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Ihiala

Loading band economics…

How many rooftops in Ihiala 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 121,011 buildings with a modelled result out of 121,337 in Ihiala. 106,697 clear a positive NPV.

Payback

Under 3 years71,907 (59%)

Under 5 years96,705 (80%)

Under 7 years106,609 (88%)

Under 10 years113,076 (93%)

Return (IRR)

Above 10%111,590 (92%)

Above 15%106,697 (88%)

Above 20%99,721 (82%)

Above 25%79,163 (65%)

CO₂ avoided

231 kt/yr

Fuel avoided

69.6 million litres/yr

Energy unlocked

92.7 GWh/yr

Demand that is suppressed today

People served

507k

What hardware costs right now

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

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 Ihiala

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	45,186	26,300	₦60.6bn	₦59.2bn	57%	1.9 yr
E	43,420	26,602	₦43.5bn	₦43.1bn	67%	1.6 yr
C	28,364	17,898	₦28.3bn	₦28bn	55%	1.9 yr
B	4,367	1,906	₦2.88bn	₦2.87bn	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	113,323	65,398	₦88.4bn	₦87.5bn	59%	1.9 yr
Commercial General	4,881	4,445	₦32.3bn	₦32bn	55%	1.9 yr
Commercial Retail	1,957	1,761	₦703m	₦703m	53%	2.1 yr
Anchor	577	552	₦10.3bn	₦9.43bn	69%	1.6 yr
Industrial	473	430	₦3.08bn	₦3.05bn	71%	1.4 yr
Worship	81	78	₦306m	₦306m	59%	1.9 yr
Filling Station	31	28	₦64.4m	₦64.4m	59%	1.9 yr
Hospitality	13	13	₦81.5m	₦81.5m	51%	2.1 yr
Mall Retail	1	1	₦313k	₦313k	49%	2.1 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	46,259	27,440	₦51.4bn	₦51.4bn	59%	1.9 yr
50 100m2	24,586	14,749	₦8.1bn	₦7.62bn	57%	1.9 yr
Under 30m2	20,095	11,939	₦1.58bn	₦1.48bn	53%	1.9 yr
250 1000m2	16,165	10,046	₦64.5bn	₦63.7bn	61%	1.6 yr
30 50m2	14,072	8,413	₦1.89bn	₦1.88bn	57%	1.9 yr
Over 1000m2	160	119	₦7.66bn	₦7.08bn	65%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	118,789	71,244	₦130bn	₦128bn	57%	1.9 yr
Urban	1,793	1,188	₦3.97bn	₦3.97bn	69%	1.6 yr
Unclassified	755	274	₦1.15bn	₦1.13bn	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	43,224	24,823	₦72.5bn	₦72.2bn	71%	1.4 yr
Residential Small	39,154	22,832	₦10.4bn	₦9.89bn	69%	1.6 yr
Shed	20,737	11,327	₦1.25bn	₦1.25bn	61%	1.6 yr
Residential Formal	7,433	4,579	₦3.06bn	₦2.99bn	41%	2.6 yr
Commercial	3,001	2,673	₦20.5bn	₦20.3bn	55%	1.9 yr
Kiosk Shop	1,957	1,761	₦703m	₦703m	53%	2.1 yr
Commercial Corridor	1,064	1,018	₦7.4bn	₦7.36bn	55%	1.9 yr
Apartment	1,062	643	₦432m	₦424m	39%	2.9 yr
Residential Informal	1,034	777	₦518m	₦518m	47%	2.4 yr
Institutional	659	618	₦6.86bn	₦6.66bn	57%	1.9 yr
Duplex	476	284	₦152m	₦152m	41%	2.6 yr
Industrial Site	374	344	₦2.33bn	₦2.31bn	71%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	121,337	72,706	₦135bn	₦133bn

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	116,215	68,026	₦94bn	₦93.1bn	59%	1.9 yr
SME High	4,107	3,730	₦28bn	₦27.7bn	55%	1.9 yr
Enterprise	1,015	950	₦13.2bn	₦12.3bn	71%	1.4 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	69,977	40,844	₦93.6bn	₦92.6bn
0.0	20,915	11,443	₦1.32bn	₦1.32bn
2.0	15,634	9,742	₦4.12bn	₦3.8bn
4.0	9,984	6,629	₦9.63bn	₦9.17bn
5.0	2,781	2,511	₦12.4bn	₦12.4bn
1.0	1,207	789	₦135m	₦135m
6.0	839	748	₦14bn	₦13.7bn