Imo State

Rooftop solar in Obowo, Imo: what the roofs are worth

Obowo has 37,963 buildings with a viable rooftop and 792 MWp of roof capacity. 57% run a generator, and together they spend ₦40.9bn a year on energy.

Viable buildings

37,963

Usable roof area

3.53 km²

792 MWp roof capacity

Energy spend

₦40.9bn/yr

38.7 GWh/yr burned on generators

Median payback

2.1 yr

Median IRR 51% (cash saved)

The savings bracket for Obowo

Approach B

Cash saved

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

Current energy spend₦40.9bn/yr

Year-one cash saved₦39.8bn

Lifetime cash saved₦2.05tn

NPV₦325bn

Median IRR51%

Median payback2.1 yr

Unlocked energy27.5 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity113 MWp

Capex₦114bn

Year-one energy value₦98.4bn

Lifetime energy value₦4.66tn

NPV₦783bn

Median IRR97%

Median payback1.1 yr

Three ways to size Obowo'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: 113 MWp
Capital cost: ₦114bn
Year 1 savings: ₦98.4bn/yr
NPV: ₦783bn
Median IRR: 97%
Median payback: 1.1 yr

The odds a rooftop in Obowo pays back quickly

Of the 37,901 buildings in Obowo with a modelled payback, 80.8% pay back inside five years and 57.3% inside three.

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How much of Obowo's demand actually gets met

Buildings in Obowo consume 53.9 GWh/yr but want 81.4 GWh/yr. The 34% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Obowo

Loading band economics…

How many rooftops in Obowo 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 37,901 buildings with a modelled result out of 37,963 in Obowo. 34,311 clear a positive NPV.

Payback

Under 3 years21,701 (57%)

Under 5 years30,619 (81%)

Under 7 years34,277 (90%)

Under 10 years35,877 (95%)

Return (IRR)

Above 10%35,497 (94%)

Above 15%34,311 (90%)

Above 20%31,681 (83%)

Above 25%23,331 (61%)

CO₂ avoided

69.9 kt/yr

Fuel avoided

21.8 million litres/yr

Energy unlocked

27.5 GWh/yr

Demand that is suppressed today

People served

200k

What hardware costs right now

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

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 Obowo

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
C	17,806	8,536	₦16.2bn	₦15.6bn	25%	4.4 yr
D	9,000	6,027	₦15.6bn	₦15.4bn	69%	1.6 yr
E	7,941	5,791	₦8.03bn	₦7.89bn	69%	1.6 yr
B	3,216	1,463	₦974m	₦974m	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	36,326	20,307	₦31.5bn	₦30.6bn	51%	2.1 yr
Commercial General	878	821	₦6.06bn	₦6.01bn	57%	1.9 yr
Anchor	328	293	₦2.41bn	₦2.41bn	59%	1.9 yr
Commercial Retail	171	171	₦52.1m	₦52.1m	65%	1.6 yr
Industrial	139	117	₦598m	₦597m	69%	1.6 yr
Worship	112	100	₦207m	₦207m	59%	1.9 yr
Filling Station	9	8	₦17.5m	₦17.5m	65%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	13,061	7,394	₦15.3bn	₦14.9bn	51%	2.1 yr
50 100m2	8,575	4,800	₦2.89bn	₦2.78bn	51%	2.1 yr
Under 30m2	7,486	4,356	₦512m	₦505m	47%	2.1 yr
30 50m2	5,526	3,137	₦709m	₦699m	51%	2.1 yr
250 1000m2	3,247	2,069	₦15.3bn	₦15.2bn	59%	1.9 yr
Over 1000m2	68	61	₦6.14bn	₦5.78bn	73%	1.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	32,899	19,248	₦30.5bn	₦29.9bn	51%	2.1 yr
Urban	3,999	2,104	₦5.64bn	₦5.43bn	59%	1.9 yr
Unclassified	1,065	465	₦4.75bn	₦4.48bn	25%	4.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	15,036	8,903	₦4.48bn	₦4.32bn	57%	1.9 yr
Residential	11,646	6,929	₦26.5bn	₦25.6bn	59%	1.9 yr
Shed	7,324	4,218	₦374m	₦374m	53%	1.9 yr
Residential Informal	2,283	238	₦214m	₦214m	23%	4.6 yr
Commercial	382	366	₦3.68bn	₦3.63bn	55%	1.9 yr
Institutional	307	270	₦2bn	₦2bn	57%	1.9 yr
Commercial Corridor	186	186	₦977m	₦977m	67%	1.6 yr
Kiosk Shop	171	171	₦52.1m	₦52.1m	65%	1.6 yr
Educational Facility	104	95	₦546m	₦546m	81%	1.4 yr
Industrial Site	97	80	₦460m	₦459m	69%	1.6 yr
School	93	85	₦222m	₦222m	79%	1.4 yr
Healthcare Facility	57	48	₦425m	₦424m	51%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	37,483	21,376	₦36.4bn	₦35.8bn
Commercial	480	441	₦4.49bn	₦4.01bn

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	36,919	20,847	₦33.2bn	₦32.2bn	51%	2.1 yr
SME High	577	560	₦4.67bn	₦4.62bn	59%	1.9 yr
Enterprise	467	410	₦3bn	₦3bn	61%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	21,504	12,817	₦33.4bn	₦32.5bn
0.0	7,360	4,237	₦381m	₦381m
2.0	6,487	3,491	₦1.68bn	₦1.62bn
4.0	1,468	498	₦2.53bn	₦2.46bn
1.0	1,001	633	₦137m	₦137m
6.0	98	98	₦1.89bn	₦1.89bn
5.0	45	43	₦884m	₦834m