Enugu State

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

Udenu has 106,009 buildings with a viable rooftop and 1.68 GWp of roof capacity. 17% run a generator, and together they spend ₦17.6bn a year on energy.

Viable buildings

106,009

Usable roof area

7.49 km²

1.68 GWp roof capacity

Energy spend

₦17.6bn/yr

15.2 GWh/yr burned on generators

Median payback

5.4 yr

Median IRR 21% (cash saved)

The savings bracket for Udenu

Approach B

Cash saved

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

Current energy spend₦17.6bn/yr

Year-one cash saved₦17.6bn

Lifetime cash saved₦961bn

NPV₦142bn

Median IRR21%

Median payback5.4 yr

Unlocked energy22.8 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity117 MWp

Capex₦120bn

Year-one energy value₦102bn

Lifetime energy value₦4.85tn

NPV₦810bn

Median IRR97%

Median payback1.1 yr

Three ways to size Udenu'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: 117 MWp
Capital cost: ₦120bn
Year 1 savings: ₦102bn/yr
NPV: ₦810bn
Median IRR: 97%
Median payback: 1.1 yr

The odds a rooftop in Udenu pays back quickly

Of the 104,124 buildings in Udenu with a modelled payback, 46.2% pay back inside five years and 16.8% inside three.

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How much of Udenu's demand actually gets met

Buildings in Udenu consume 32.5 GWh/yr but want 55.3 GWh/yr. The 41% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Udenu

Loading band economics…

How many rooftops in Udenu 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 104,124 buildings with a modelled result out of 106,009 in Udenu. 69,434 clear a positive NPV.

Payback

Under 3 years17,486 (17%)

Under 5 years48,112 (46%)

Under 7 years69,287 (67%)

Under 10 years82,552 (79%)

Return (IRR)

Above 10%79,988 (75%)

Above 15%69,434 (65%)

Above 20%53,311 (50%)

Above 25%39,317 (37%)

CO₂ avoided

36.5 kt/yr

Fuel avoided

8 million litres/yr

Energy unlocked

22.8 GWh/yr

Demand that is suppressed today

People served

280k

What hardware costs right now

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

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 Udenu

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
C	32,529	5,018	₦4.86bn	₦4.86bn	19%	5.6 yr
B	28,091	3,993	₦4.07bn	₦4.07bn	21%	4.9 yr
D	24,487	5,422	₦5.02bn	₦5.02bn	21%	5.4 yr
E	20,902	4,017	₦3.64bn	₦3.64bn	19%	5.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	102,825	16,551	₦11.7bn	₦11.7bn	19%	5.4 yr
Commercial General	1,484	878	₦2.28bn	₦2.28bn	39%	2.6 yr
Commercial Retail	898	425	₦85.4m	₦85.4m	33%	3.1 yr
Anchor	585	449	₦3.19bn	₦3.19bn	55%	1.9 yr
Industrial	125	85	₦226m	₦226m	61%	1.6 yr
Worship	47	39	₦43.9m	₦43.9m	59%	1.9 yr
Filling Station	35	20	₦13.8m	₦13.8m	41%	2.6 yr
Hospitality	8	2	₦1.88m	₦1.88m	33%	3.1 yr
Automotive	1	1	₦76.5k	₦76.5k	49%	2.1 yr
Mall Retail	1	0	₦104k	₦104k	33%	3.1 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	30,271	5,669	₦7.57bn	₦7.57bn	25%	4.4 yr
Under 30m2	27,141	4,426	₦396m	₦396m	7%	13.9 yr
50 100m2	26,810	4,262	₦1.53bn	₦1.53bn	21%	5.4 yr
30 50m2	17,760	2,843	₦469m	₦469m	11%	8.6 yr
250 1000m2	3,963	1,214	₦5.29bn	₦5.29bn	27%	4.1 yr
Over 1000m2	64	36	₦2.33bn	₦2.33bn	41%	2.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	64,446	10,966	₦10bn	₦10bn	19%	5.4 yr
Urban	28,758	5,511	₦5.73bn	₦5.73bn	21%	5.1 yr
Dense Urban	6,988	1,080	₦873m	₦873m	17%	5.9 yr
Unclassified	5,225	717	₦842m	₦841m	21%	5.4 yr
Rural	592	176	₦126m	₦126m	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	33,424	6,769	₦9.47bn	₦9.47bn	25%	4.4 yr
Shed	28,392	3,819	₦344m	₦344m	9%	13.4 yr
Residential Small	26,467	4,599	₦1.38bn	₦1.38bn	19%	5.4 yr
Residential Formal	8,260	0	₦144m	₦144m	17%	6.1 yr
Residential Informal	6,099	1,358	₦406m	₦406m	21%	4.9 yr
Kiosk Shop	898	425	₦85.4m	₦85.4m	33%	3.1 yr
Commercial	615	205	₦629m	₦629m	35%	3.1 yr
Institutional	408	316	₦2.7bn	₦2.7bn	53%	1.9 yr
Commercial Corridor	345	318	₦623m	₦623m	65%	1.6 yr
Educational Facility	205	169	₦585m	₦585m	81%	1.4 yr
School	167	131	₦203m	₦203m	77%	1.4 yr
Unknown	134	61	₦77.1m	₦77.1m	31%	3.6 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	106,009	18,450	₦17.6bn	₦17.6bn

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	104,330	17,389	₦13bn	₦13bn	19%	5.4 yr
SME High	1,000	545	₦1.27bn	₦1.27bn	37%	2.9 yr
Enterprise	679	516	₦3.32bn	₦3.32bn	57%	1.9 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
2.0	32,010	5,835	₦3.46bn	₦3.46bn
0.0	28,411	3,824	₦346m	₦346m
3.0	27,223	5,664	₦11.6bn	₦11.6bn
1.0	11,152	2,732	₦462m	₦462m
4.0	6,725	297	₦1.33bn	₦1.33bn
5.0	469	90	₦328m	₦328m
6.0	19	8	₦40.9m	₦40.9m