Benue State

Rooftop solar in Oju, Benue: what the roofs are worth

Oju has 68,858 buildings with a viable rooftop and 1.03 GWp of roof capacity. 37% run a generator, and together they spend ₦26.2bn a year on energy.

Viable buildings

68,858

Usable roof area

4.63 km²

1.03 GWp roof capacity

Energy spend

₦26.2bn/yr

24.6 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Oju

Approach B

Cash saved

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

Current energy spend₦26.2bn/yr

Year-one cash saved₦26bn

Lifetime cash saved₦1.34tn

NPV₦213bn

Median IRR25%

Median payback4.4 yr

Unlocked energy22.5 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity114 MWp

Capex₦120bn

Year-one energy value₦113bn

Lifetime energy value₦5.39tn

NPV₦915bn

Median IRR103%

Median payback1.1 yr

Three ways to size Oju'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: 114 MWp
Capital cost: ₦120bn
Year 1 savings: ₦113bn/yr
NPV: ₦915bn
Median IRR: 103%
Median payback: 1.1 yr

The odds a rooftop in Oju pays back quickly

Of the 68,665 buildings in Oju with a modelled payback, 66.5% pay back inside five years and 36.5% inside three.

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How much of Oju's demand actually gets met

Buildings in Oju consume 35.4 GWh/yr but want 58 GWh/yr. The 39% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Oju

Loading band economics…

How many rooftops in Oju 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 68,665 buildings with a modelled result out of 68,858 in Oju. 51,385 clear a positive NPV.

Payback

Under 3 years25,054 (36%)

Under 5 years45,666 (67%)

Under 7 years51,363 (75%)

Under 10 years54,814 (80%)

Return (IRR)

Above 10%53,564 (78%)

Above 15%51,385 (75%)

Above 20%47,856 (69%)

Above 25%40,104 (58%)

CO₂ avoided

47.8 kt/yr

Fuel avoided

14.1 million litres/yr

Energy unlocked

22.5 GWh/yr

Demand that is suppressed today

People served

318k

What hardware costs right now

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

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 Oju

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
C	25,857	9,180	₦9.55bn	₦9.53bn	25%	4.4 yr
D	21,516	7,770	₦7.86bn	₦7.86bn	25%	4.4 yr
E	21,485	8,262	₦8.77bn	₦8.65bn	25%	4.1 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	67,036	23,404	₦20.5bn	₦20.4bn	25%	4.4 yr
Commercial General	663	661	₦2.56bn	₦2.56bn	63%	1.6 yr
Anchor	531	523	₦2.39bn	₦2.38bn	71%	1.4 yr
Worship	319	315	₦254m	₦254m	61%	1.6 yr
Commercial Retail	142	142	₦54.1m	₦54.1m	63%	1.6 yr
Productive Use	85	85	₦73.4m	₦73.4m	67%	1.6 yr
Hospitality	47	47	₦237m	₦237m	69%	1.6 yr
Industrial	35	35	₦72.6m	₦72.5m	71%	1.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
50 100m2	21,967	7,330	₦4.02bn	₦4.02bn	25%	4.4 yr
100 250m2	19,785	9,429	₦13.8bn	₦13.7bn	27%	4.1 yr
Under 30m2	14,827	3,987	₦366m	₦366m	7%	15.1 yr
30 50m2	10,518	3,331	₦607m	₦607m	11%	8.9 yr
250 1000m2	1,730	1,114	₦6.58bn	₦6.58bn	63%	1.6 yr
Over 1000m2	31	21	₦812m	₦812m	63%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	24,360	9,793	₦10.2bn	₦10.2bn	25%	4.1 yr
Unclassified	22,111	4,832	₦6.34bn	₦6.2bn	25%	4.4 yr
Rural	12,082	5,085	₦3.72bn	₦3.72bn	25%	4.4 yr
Dense Urban	10,305	5,502	₦5.9bn	₦5.9bn	43%	2.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	26,431	8,957	₦4.78bn	₦4.77bn	25%	4.4 yr
Shed	20,101	4,920	₦431m	₦431m	7%	14.1 yr
Residential	15,110	6,937	₦14.6bn	₦14.5bn	27%	4.1 yr
Residential Formal	4,584	2,183	₦604m	₦604m	27%	4.1 yr
Apartment	638	332	₦98m	₦98m	49%	2.1 yr
Institutional	381	378	₦1.35bn	₦1.35bn	57%	1.9 yr
Kiosk Shop	218	218	₦118m	₦118m	65%	1.6 yr
Commercial Corridor	189	189	₦398m	₦398m	65%	1.6 yr
Educational Facility	174	173	₦400m	₦400m	83%	1.4 yr
Duplex	172	75	₦21.6m	₦21.6m	25%	4.1 yr
Commercial	156	156	₦1.38bn	₦1.37bn	69%	1.6 yr
Worship Center	120	118	₦57.3m	₦57.3m	63%	1.6 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	68,858	25,212	₦26.2bn	₦26bn

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	67,955	24,317	₦22bn	₦21.8bn	25%	4.4 yr
Enterprise	540	532	₦2.39bn	₦2.39bn	73%	1.4 yr
SME High	363	363	₦1.83bn	₦1.83bn	65%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	20,104	4,924	₦432m	₦432m
3.0	18,082	8,982	₦15.9bn	₦15.8bn
2.0	17,488	6,722	₦6.41bn	₦6.4bn
1.0	7,906	1,931	₦1.05bn	₦1.04bn
4.0	5,268	2,643	₦2.02bn	₦2.02bn
5.0	9	9	₦345m	₦343m
6.0	1	1	₦25.6m	₦25.6m