Nasarawa State

Rooftop solar in Obi, Nasarawa: what the roofs are worth

Obi has 60,558 buildings with a viable rooftop and 624 MWp of roof capacity. 13% run a generator, and together they spend ₦12.8bn a year on energy.

Viable buildings

60,558

Usable roof area

2.81 km²

624 MWp roof capacity

Energy spend

₦12.8bn/yr

10.8 GWh/yr burned on generators

Median payback

5.9 yr

Median IRR 17% (cash saved)

The savings bracket for Obi

Approach B

Cash saved

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

Current energy spend₦12.8bn/yr

Year-one cash saved₦12.6bn

Lifetime cash saved₦695bn

NPV₦103bn

Median IRR17%

Median payback5.9 yr

Unlocked energy16.2 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity79.3 MWp

Capex₦81.7bn

Year-one energy value₦74.4bn

Lifetime energy value₦3.52tn

NPV₦596bn

Median IRR91%

Median payback1.1 yr

Three ways to size Obi'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: 79.3 MWp
Capital cost: ₦81.7bn
Year 1 savings: ₦74.4bn/yr
NPV: ₦596bn
Median IRR: 91%
Median payback: 1.1 yr

The odds a rooftop in Obi pays back quickly

Of the 58,955 buildings in Obi with a modelled payback, 44.2% pay back inside five years and 13.5% inside three.

Create a free account

How much of Obi's demand actually gets met

Buildings in Obi consume 24.5 GWh/yr but want 40.8 GWh/yr. The 40% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

Create a free account

Electricity billing bands in Obi

Loading band economics…

How many rooftops in Obi 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 58,955 buildings with a modelled result out of 60,558 in Obi. 32,536 clear a positive NPV.

Payback

Under 3 years7,937 (13%)

Under 5 years26,080 (44%)

Under 7 years32,536 (55%)

Under 10 years37,412 (63%)

Return (IRR)

Above 10%36,253 (60%)

Above 15%32,536 (54%)

Above 20%27,956 (46%)

Above 25%22,829 (38%)

CO₂ avoided

26.3 kt/yr

Fuel avoided

5.58 million litres/yr

Energy unlocked

16.2 GWh/yr

Demand that is suppressed today

People served

229k

What hardware costs right now

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

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 Obi

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	29,779	2,897	₦6.01bn	₦5.89bn	19%	5.6 yr
E	24,438	4,019	₦5.49bn	₦5.42bn	9%	9.9 yr
C	6,341	1,230	₦1.32bn	₦1.32bn	25%	4.1 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	56,884	5,239	₦8.75bn	₦8.55bn	15%	6.4 yr
Commercial General	1,482	1,151	₦2.16bn	₦2.16bn	59%	1.9 yr
Commercial Retail	1,452	1,216	₦216m	₦216m	59%	1.9 yr
Worship	440	317	₦321m	₦321m	55%	1.9 yr
Anchor	285	213	₦1.36bn	₦1.36bn	55%	1.9 yr
Industrial	15	10	₦16.9m	₦16.8m	63%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	26,280	1,995	₦373m	₦252m	5%	17.1 yr
50 100m2	13,881	2,184	₦1.71bn	₦1.71bn	27%	4.1 yr
30 50m2	9,892	1,288	₦358m	₦358m	15%	6.6 yr
100 250m2	9,231	2,227	₦4.95bn	₦4.95bn	27%	3.9 yr
250 1000m2	1,234	430	₦4.2bn	₦4.12bn	29%	3.9 yr
Over 1000m2	40	22	₦1.24bn	₦1.24bn	35%	1.9 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Unclassified	18,775	584	₦1.48bn	₦1.48bn	5%	17.9 yr
Rural	13,869	2,541	₦3.34bn	₦3.21bn	23%	4.9 yr
Urban	13,683	2,780	₦4.59bn	₦4.51bn	27%	4.1 yr
Dense Urban	12,021	2,084	₦2.59bn	₦2.59bn	21%	4.9 yr
(Unset)	2,210	157	₦825m	₦824m	23%	4.9 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	27,684	1,455	₦186m	₦186m	5%	16.4 yr
Residential Small	14,650	2,092	₦1.68bn	₦1.68bn	27%	4.1 yr
Residential Formal	7,647	404	₦297m	₦297m	19%	5.4 yr
Residential	6,078	1,288	₦6.54bn	₦6.35bn	27%	3.9 yr
Kiosk Shop	1,452	1,216	₦216m	₦216m	59%	1.9 yr
Commercial Corridor	1,009	806	₦1.41bn	₦1.41bn	61%	1.6 yr
Residential Informal	825	0	₦43.1m	₦43.1m	19%	5.6 yr
Commercial	305	219	₦460m	₦460m	59%	1.9 yr
Institutional	305	229	₦997m	₦997m	53%	2.1 yr
Worship Center	153	109	₦63.8m	₦63.8m	59%	1.9 yr
Place Of Worship	138	100	₦30m	₦30m	57%	1.9 yr
Educational Facility	97	78	₦156m	₦156m	79%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	60,558	8,146	₦12.8bn	₦12.6bn

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	58,954	6,904	₦9.59bn	₦9.39bn	17%	6.1 yr
SME High	1,314	1,025	₦1.87bn	₦1.87bn	61%	1.9 yr
Enterprise	290	217	₦1.37bn	₦1.37bn	55%	1.9 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	27,708	1,477	₦188m	₦188m
2.0	13,058	2,295	₦2.84bn	₦2.84bn
1.0	7,690	1,913	₦899m	₦777m
3.0	6,562	1,914	₦7.47bn	₦7.39bn
4.0	5,478	517	₦1.17bn	₦1.17bn
5.0	60	29	₦254m	₦254m
6.0	2	1	₦8.33m	₦8.33m