Enugu State

Rooftop solar in Udi, Enugu: what the roofs are worth

Udi has 114,604 buildings with a viable rooftop and 2.16 GWp of roof capacity. 15% run a generator, and together they spend ₦31.3bn a year on energy.

Viable buildings

114,604

Usable roof area

9.63 km²

2.16 GWp roof capacity

Energy spend

₦31.3bn/yr

28.2 GWh/yr burned on generators

Median payback

5.4 yr

Median IRR 19% (cash saved)

The savings bracket for Udi

Approach B

Cash saved

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

Current energy spend₦31.3bn/yr

Year-one cash saved₦31.2bn

Lifetime cash saved₦1.7tn

NPV₦247bn

Median IRR19%

Median payback5.4 yr

Unlocked energy35.5 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity192 MWp

Capex₦186bn

Year-one energy value₦146bn

Lifetime energy value₦6.94tn

NPV₦1.15tn

Median IRR97%

Median payback1.1 yr

Three ways to size Udi'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: 192 MWp
Capital cost: ₦186bn
Year 1 savings: ₦146bn/yr
NPV: ₦1.15tn
Median IRR: 97%
Median payback: 1.1 yr

The odds a rooftop in Udi pays back quickly

Of the 112,414 buildings in Udi with a modelled payback, 44.8% pay back inside five years and 14.5% inside three.

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How much of Udi's demand actually gets met

Buildings in Udi consume 65.5 GWh/yr but want 101 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 Udi

Loading band economics…

How many rooftops in Udi 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 112,414 buildings with a modelled result out of 114,604 in Udi. 73,060 clear a positive NPV.

Payback

Under 3 years16,356 (15%)

Under 5 years50,407 (45%)

Under 7 years72,836 (65%)

Under 10 years88,466 (79%)

Return (IRR)

Above 10%85,821 (75%)

Above 15%73,060 (64%)

Above 20%55,873 (49%)

Above 25%40,831 (36%)

CO₂ avoided

62 kt/yr

Fuel avoided

12.5 million litres/yr

Energy unlocked

35.5 GWh/yr

Demand that is suppressed today

People served

363k

What hardware costs right now

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

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 Udi

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
C	31,229	3,153	₦5.26bn	₦5.26bn	17%	5.9 yr
D	30,265	3,510	₦4.6bn	₦4.6bn	17%	6.1 yr
E	25,208	4,240	₦5.01bn	₦4.96bn	19%	5.6 yr
B	14,586	2,783	₦4.61bn	₦4.6bn	23%	4.6 yr
A	13,316	3,343	₦11.8bn	₦11.8bn	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	109,305	14,744	₦14.5bn	₦14.4bn	19%	5.6 yr
Commercial General	2,637	972	₦6.55bn	₦6.53bn	35%	3.1 yr
Commercial Retail	1,475	436	₦165m	₦165m	33%	3.4 yr
Anchor	728	557	₦9.08bn	₦9.08bn	55%	1.9 yr
Industrial	339	236	₦794m	₦790m	63%	1.6 yr
Worship	92	71	₦216m	₦216m	57%	1.9 yr
Filling Station	24	11	₦14.5m	₦14.5m	35%	3.1 yr
Hospitality	4	2	₦4.32m	₦4.32m	33%	2.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	36,479	5,442	₦7.94bn	₦7.92bn	25%	4.4 yr
50 100m2	29,288	3,841	₦1.58bn	₦1.58bn	17%	6.1 yr
Under 30m2	24,407	3,459	₦394m	₦391m	7%	14.6 yr
30 50m2	17,187	2,397	₦445m	₦445m	11%	9.4 yr
250 1000m2	7,086	1,786	₦11.8bn	₦11.7bn	25%	4.4 yr
Over 1000m2	157	104	₦9.19bn	₦9.19bn	49%	2.1 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	48,968	8,242	₦16.7bn	₦16.7bn	19%	5.6 yr
Dense Urban	31,276	3,560	₦3.47bn	₦3.47bn	17%	6.1 yr
Urban Centre	26,733	4,252	₦7.53bn	₦7.51bn	23%	4.6 yr
Unclassified	6,296	832	₦3.5bn	₦3.44bn	19%	5.4 yr
Rural	1,331	143	₦139m	₦139m	17%	6.1 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	37,436	5,463	₦1.61bn	₦1.61bn	17%	6.1 yr
Residential	32,883	4,975	₦11.4bn	₦11.4bn	25%	4.4 yr
Shed	25,028	3,024	₦295m	₦295m	7%	13.9 yr
Residential Formal	6,967	397	₦227m	₦227m	19%	5.4 yr
Residential Informal	6,616	843	₦887m	₦887m	21%	5.1 yr
Kiosk Shop	1,475	436	₦165m	₦165m	33%	3.4 yr
Commercial Corridor	1,016	208	₦1.67bn	₦1.67bn	35%	3.1 yr
Commercial	881	267	₦3.45bn	₦3.42bn	35%	3.1 yr
Institutional	665	505	₦8.81bn	₦8.81bn	51%	2.1 yr
Educational Facility	257	200	₦690m	₦690m	75%	1.4 yr
Industrial Site	250	180	₦543m	₦542m	63%	1.6 yr
School	209	158	₦298m	₦298m	71%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	114,569	17,024	₦31.3bn	₦31.2bn
Commercial	27	0	₦260k	₦260k
Farmland	8	5	₦30.3m	₦30.3m

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	111,653	15,776	₦16.3bn	₦16.3bn	19%	5.6 yr
SME High	1,922	487	₦5.13bn	₦5.11bn	35%	3.1 yr
Enterprise	1,029	766	₦9.84bn	₦9.83bn	57%	1.9 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	35,722	6,265	₦18.5bn	₦18.5bn
2.0	35,668	5,179	₦2.82bn	₦2.82bn
0.0	25,123	3,047	₦300m	₦300m
1.0	9,403	1,718	₦369m	₦369m
4.0	7,941	800	₦7.66bn	₦7.64bn
5.0	603	20	₦1.18bn	₦1.18bn
6.0	144	0	₦430m	₦430m