Abia State

Rooftop solar in Umuahia North, Abia: what the roofs are worth

Umuahia North has 90,915 buildings with a viable rooftop and 2.32 GWp of roof capacity. 31% run a generator, and together they spend ₦54.5bn a year on energy.

Viable buildings

90,915

Usable roof area

10.3 km²

2.32 GWp roof capacity

Energy spend

₦54.5bn/yr

43.7 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Umuahia North

Approach B

Cash saved

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

Current energy spend₦54.5bn/yr

Year-one cash saved₦54.1bn

Lifetime cash saved₦2.95tn

NPV₦426bn

Median IRR25%

Median payback4.4 yr

Unlocked energy50.3 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity215 MWp

Capex₦209bn

Year-one energy value₦144bn

Lifetime energy value₦6.8tn

NPV₦1.1tn

Median IRR65%

Median payback1.6 yr

Three ways to size Umuahia North'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: 215 MWp
Capital cost: ₦209bn
Year 1 savings: ₦144bn/yr
NPV: ₦1.1tn
Median IRR: 65%
Median payback: 1.6 yr

The odds a rooftop in Umuahia North pays back quickly

Of the 90,092 buildings in Umuahia North with a modelled payback, 68.8% pay back inside five years and 29.2% inside three.

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How much of Umuahia North's demand actually gets met

Buildings in Umuahia North consume 102 GWh/yr but want 152 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 Umuahia North

Loading band economics…

How many rooftops in Umuahia North 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 90,092 buildings with a modelled result out of 90,915 in Umuahia North. 76,843 clear a positive NPV.

Payback

Under 3 years26,347 (29%)

Under 5 years62,025 (69%)

Under 7 years76,712 (85%)

Under 10 years84,085 (93%)

Return (IRR)

Above 10%83,101 (91%)

Above 15%76,843 (85%)

Above 20%66,274 (73%)

Above 25%36,808 (40%)

CO₂ avoided

106 kt/yr

Fuel avoided

25 million litres/yr

Energy unlocked

50.3 GWh/yr

Demand that is suppressed today

People served

245k

What hardware costs right now

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

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 Umuahia North

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
A	49,845	8,919	₦17.6bn	₦17.3bn	25%	4.4 yr
B	18,526	7,734	₦10.9bn	₦10.9bn	25%	4.4 yr
C	9,812	5,103	₦10bn	₦9.91bn	51%	2.1 yr
D	7,049	3,714	₦9.74bn	₦9.69bn	67%	1.6 yr
E	5,683	2,452	₦6.32bn	₦6.32bn	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	86,059	26,066	₦37.8bn	₦37.7bn	25%	4.4 yr
Commercial General	2,017	673	₦5.44bn	₦5.44bn	33%	3.1 yr
Anchor	1,176	551	₦8.96bn	₦8.67bn	41%	2.6 yr
Commercial Retail	564	77	₦75.8m	₦75.8m	33%	3.4 yr
Worship	529	282	₦471m	₦471m	35%	3.1 yr
Industrial	347	213	₦1.06bn	₦1.06bn	47%	2.4 yr
Hospitality	117	33	₦525m	₦511m	33%	3.1 yr
Filling Station	74	23	₦58.2m	₦58.2m	33%	3.1 yr
Mall Retail	18	2	₦67m	₦67m	33%	3.1 yr
Productive Use	11	2	₦9.29m	₦9.29m	35%	3.1 yr
Automotive	3	0	₦886k	₦886k	29%	3.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	31,913	9,414	₦18bn	₦18bn	25%	4.4 yr
50 100m2	18,940	5,719	₦3.07bn	₦3.06bn	23%	4.6 yr
Under 30m2	15,624	4,736	₦647m	₦641m	15%	6.6 yr
250 1000m2	12,569	4,325	₦24.8bn	₦24.7bn	25%	4.4 yr
30 50m2	11,597	3,595	₦850m	₦850m	19%	5.6 yr
Over 1000m2	272	133	₦7.06bn	₦6.84bn	35%	3.1 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	67,939	16,326	₦27.1bn	₦26.8bn	25%	4.4 yr
Urban	11,931	5,420	₦14.5bn	₦14.5bn	25%	4.4 yr
Dense Urban	7,408	4,759	₦8.6bn	₦8.59bn	57%	1.9 yr
Unclassified	3,637	1,417	₦4.3bn	₦4.2bn	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Informal	20,514	2,354	₦2.29bn	₦2.29bn	23%	4.6 yr
Residential Formal	18,523	4,071	₦3.05bn	₦3.05bn	25%	4.4 yr
Residential Small	18,438	7,804	₦4.01bn	₦4.01bn	25%	4.4 yr
Residential	16,548	7,592	₦27.6bn	₦27.5bn	25%	4.4 yr
Shed	9,305	3,683	₦550m	₦550m	19%	5.6 yr
Apartment	2,093	433	₦209m	₦209m	25%	4.4 yr
Institutional	926	505	₦6.28bn	₦6.28bn	33%	3.4 yr
Commercial Corridor	689	45	₦1.24bn	₦1.24bn	33%	3.1 yr
Kiosk Shop	564	76	₦61.3m	₦61.3m	33%	3.4 yr
Duplex	547	100	₦53.5m	₦53.5m	25%	4.4 yr
Educational Facility	322	147	₦733m	₦733m	43%	2.4 yr
School	318	141	₦560m	₦560m	43%	2.6 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	90,869	27,907	₦54.4bn	₦53.9bn
Commercial	16	3	₦122m	₦122m
Industrial	15	5	₦2.18m	₦2.18m
Farmyard	8	2	₦948k	₦948k
Farmland	7	5	₦6.87m	₦6.87m

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	88,394	26,955	₦41.8bn	₦41.7bn	25%	4.4 yr
Enterprise	1,493	754	₦9.96bn	₦9.66bn	41%	2.6 yr
SME High	1,028	213	₦2.73bn	₦2.73bn	35%	3.1 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	34,545	13,766	₦36.9bn	₦36.8bn
4.0	33,093	5,954	₦13.1bn	₦12.8bn
2.0	11,737	3,824	₦2.17bn	₦2.17bn
0.0	9,177	3,595	₦528m	₦528m
1.0	1,942	756	₦217m	₦217m
5.0	344	21	₦986m	₦984m
6.0	77	6	₦529m	₦529m