Enugu State

Rooftop solar in Igbo-Etiti, Enugu: what the roofs are worth

Igbo-Etiti has 51,657 buildings with a viable rooftop and 865 MWp of roof capacity. 13% run a generator, and together they spend ₦16.5bn a year on energy.

Viable buildings

51,657

Usable roof area

3.86 km²

865 MWp roof capacity

Energy spend

₦16.5bn/yr

15.6 GWh/yr burned on generators

Median payback

5.1 yr

Median IRR 21% (cash saved)

The savings bracket for Igbo-Etiti

Approach B

Cash saved

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

Current energy spend₦16.5bn/yr

Year-one cash saved₦16.4bn

Lifetime cash saved₦859bn

NPV₦133bn

Median IRR21%

Median payback5.1 yr

Unlocked energy14.8 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity93.4 MWp

Capex₦96.5bn

Year-one energy value₦88.9bn

Lifetime energy value₦4.23tn

NPV₦716bn

Median IRR101%

Median payback1.1 yr

Three ways to size Igbo-Etiti'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: 93.4 MWp
Capital cost: ₦96.5bn
Year 1 savings: ₦88.9bn/yr
NPV: ₦716bn
Median IRR: 101%
Median payback: 1.1 yr

The odds a rooftop in Igbo-Etiti pays back quickly

Of the 51,204 buildings in Igbo-Etiti with a modelled payback, 48.9% pay back inside five years and 12.6% inside three.

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How much of Igbo-Etiti's demand actually gets met

Buildings in Igbo-Etiti consume 25.2 GWh/yr but want 40 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 Igbo-Etiti

Loading band economics…

How many rooftops in Igbo-Etiti 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 51,204 buildings with a modelled result out of 51,657 in Igbo-Etiti. 33,326 clear a positive NPV.

Payback

Under 3 years6,461 (13%)

Under 5 years25,061 (49%)

Under 7 years33,278 (65%)

Under 10 years37,050 (72%)

Return (IRR)

Above 10%36,120 (70%)

Above 15%33,326 (65%)

Above 20%27,812 (54%)

Above 25%19,788 (38%)

CO₂ avoided

30.4 kt/yr

Fuel avoided

8.29 million litres/yr

Energy unlocked

14.8 GWh/yr

Demand that is suppressed today

People served

274k

What hardware costs right now

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

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 Igbo-Etiti

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	22,650	2,648	₦6.39bn	₦6.39bn	21%	5.1 yr
E	20,337	2,788	₦7.46bn	₦7.36bn	21%	5.1 yr
C	6,910	774	₦1.64bn	₦1.63bn	21%	5.4 yr
B	1,760	357	₦994m	₦994m	23%	4.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	50,293	5,403	₦11.6bn	₦11.5bn	21%	5.1 yr
Commercial General	566	473	₦1.48bn	₦1.48bn	57%	1.9 yr
Anchor	374	348	₦2.97bn	₦2.97bn	73%	1.4 yr
Commercial Retail	221	184	₦27.2m	₦27.2m	59%	1.9 yr
Industrial	178	137	₦359m	₦359m	63%	1.6 yr
Worship	18	18	₦7.07m	₦7.07m	57%	1.9 yr
Filling Station	5	4	₦4.15m	₦4.15m	59%	1.9 yr
Hospitality	2	0	₦69.8k	₦69.8k	27%	3.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	14,427	2,061	₦5.88bn	₦5.78bn	25%	4.4 yr
Under 30m2	13,828	1,373	₦204m	₦198m	5%	15.9 yr
50 100m2	12,904	1,469	₦1.1bn	₦1.1bn	23%	4.9 yr
30 50m2	7,851	880	₦265m	₦265m	9%	9.6 yr
250 1000m2	2,603	761	₦7.15bn	₦7.15bn	27%	4.1 yr
Over 1000m2	44	23	₦1.88bn	₦1.88bn	55%	1.9 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	33,035	4,548	₦9.65bn	₦9.55bn	23%	4.9 yr
Urban	12,865	1,587	₦4.31bn	₦4.31bn	21%	5.1 yr
Unclassified	3,963	400	₦2.46bn	₦2.45bn	7%	13.6 yr
Dense Urban	1,357	10	₦46.7m	₦46.7m	17%	6.1 yr
Rural	437	22	₦23.3m	₦23.3m	13%	8.1 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	15,691	2,142	₦10bn	₦9.9bn	25%	4.4 yr
Shed	15,104	1,120	₦121m	₦121m	7%	15.6 yr
Residential Small	13,959	1,959	₦1.32bn	₦1.32bn	21%	5.1 yr
Residential Formal	5,380	163	₦193m	₦193m	23%	4.9 yr
Institutional	319	273	₦2.21bn	₦2.21bn	55%	1.9 yr
Kiosk Shop	221	184	₦27.2m	₦27.2m	59%	1.9 yr
Educational Facility	131	122	₦533m	₦533m	83%	1.4 yr
Industrial Site	116	82	₦256m	₦256m	65%	1.6 yr
Commercial Corridor	116	85	₦273m	₦273m	65%	1.6 yr
Commercial	114	113	₦282m	₦282m	63%	1.6 yr
School	88	82	₦206m	₦206m	81%	1.4 yr
Healthcare Facility	73	68	₦605m	₦605m	51%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	51,657	6,567	₦16.5bn	₦16.4bn

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	50,899	5,904	₦12.6bn	₦12.5bn	21%	5.1 yr
Enterprise	522	461	₦3.29bn	₦3.29bn	65%	1.6 yr
SME High	236	202	₦560m	₦560m	63%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	15,151	1,130	₦123m	₦123m
3.0	13,650	2,481	₦13bn	₦13bn
2.0	13,406	1,908	₦2.4bn	₦2.3bn
1.0	5,080	800	₦280m	₦275m
4.0	4,365	247	₦688m	₦688m
5.0	5	1	₦44.5m	₦44.5m