Taraba State

Rooftop solar in Wukari, Taraba: what the roofs are worth

Wukari has 229,045 buildings with a viable rooftop and 1.37 GWp of roof capacity. 8% run a generator, and together they spend ₦17.8bn a year on energy.

Viable buildings

229,045

Usable roof area

6.25 km²

1.37 GWp roof capacity

Energy spend

₦17.8bn/yr

13.7 GWh/yr burned on generators

Median payback

16.6 yr

Median IRR 5% (cash saved)

The savings bracket for Wukari

Approach B

Cash saved

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

Current energy spend₦17.8bn/yr

Year-one cash saved₦17.4bn

Lifetime cash saved₦962bn

NPV₦135bn

Median IRR5%

Median payback16.6 yr

Unlocked energy21.3 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity120 MWp

Capex₦126bn

Year-one energy value₦112bn

Lifetime energy value₦5.31tn

NPV₦897bn

Median IRR91%

Median payback1.1 yr

Three ways to size Wukari'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: 120 MWp
Capital cost: ₦126bn
Year 1 savings: ₦112bn/yr
NPV: ₦897bn
Median IRR: 91%
Median payback: 1.1 yr

The odds a rooftop in Wukari pays back quickly

Of the 222,717 buildings in Wukari with a modelled payback, 18.6% pay back inside five years and 7.3% inside three.

Create a free account

How much of Wukari's demand actually gets met

Buildings in Wukari consume 35.8 GWh/yr but want 57.1 GWh/yr. The 37% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

Create a free account

Electricity billing bands in Wukari

Loading band economics…

How many rooftops in Wukari 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 222,717 buildings with a modelled result out of 229,045 in Wukari. 53,942 clear a positive NPV.

Payback

Under 3 years16,154 (7%)

Under 5 years41,479 (19%)

Under 7 years53,964 (24%)

Under 10 years68,518 (31%)

Return (IRR)

Above 10%65,614 (29%)

Above 15%53,942 (24%)

Above 20%44,177 (19%)

Above 25%36,333 (16%)

CO₂ avoided

36.6 kt/yr

Fuel avoided

7.56 million litres/yr

Energy unlocked

21.3 GWh/yr

Demand that is suppressed today

People served

385k

What hardware costs right now

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

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 Wukari

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	82,700	3,057	₦3.89bn	₦3.82bn	5%	17.6 yr
E	69,310	3,115	₦3.14bn	₦2.98bn	5%	17.6 yr
B	35,565	6,942	₦6.21bn	₦6bn	17%	5.6 yr
C	32,499	2,939	₦3.28bn	₦3.28bn	5%	16.4 yr
A	8,971	1,655	₦1.31bn	₦1.31bn	15%	6.1 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	223,008	15,379	₦12.8bn	₦12.3bn	5%	16.9 yr
Commercial Retail	3,110	961	₦163m	₦163m	33%	3.1 yr
Commercial General	2,001	710	₦3.25bn	₦3.25bn	37%	2.9 yr
Anchor	597	433	₦1.41bn	₦1.4bn	51%	2.1 yr
Worship	196	160	₦64.9m	₦64.9m	51%	2.1 yr
Industrial	96	54	₦67.3m	₦67.3m	51%	2.1 yr
Filling Station	23	6	₦6.48m	₦6.48m	35%	3.1 yr
Hospitality	10	5	₦105m	₦105m	37%	2.6 yr
Mall Retail	4	0	₦9.3m	₦9.3m	35%	2.9 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	164,013	7,528	₦798m	₦750m	5%	17.9 yr
30 50m2	24,020	2,671	₦713m	₦564m	9%	12.9 yr
50 100m2	23,913	3,226	₦2.2bn	₦2.14bn	23%	4.6 yr
100 250m2	14,616	3,323	₦6bn	₦5.99bn	27%	3.9 yr
250 1000m2	2,425	927	₦6.93bn	₦6.78bn	29%	3.9 yr
Over 1000m2	58	33	₦1.19bn	₦1.17bn	47%	2.1 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Unclassified	85,249	2,911	₦6bn	₦5.6bn	5%	17.9 yr
Urban	55,615	2,969	₦4.14bn	₦4.14bn	5%	17.1 yr
Urban Centre	34,541	7,377	₦5.54bn	₦5.54bn	17%	5.4 yr
Rural	31,347	3,153	₦1.46bn	₦1.44bn	5%	16.6 yr
Dense Urban	22,293	1,298	₦679m	₦679m	7%	13.1 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	162,459	6,296	₦587m	₦587m	5%	17.9 yr
Residential Small	23,323	3,585	₦2.41bn	₦2.2bn	25%	4.4 yr
Residential	16,263	3,262	₦8.77bn	₦8.56bn	25%	4.4 yr
Residential Informal	16,213	2,062	₦894m	₦894m	13%	6.4 yr
Residential Formal	4,399	140	₦79.3m	₦79.3m	11%	6.9 yr
Kiosk Shop	3,108	960	₦162m	₦162m	33%	3.1 yr
Commercial	1,285	179	₦2.02bn	₦2.02bn	35%	3.1 yr
Institutional	448	329	₦1.1bn	₦1.09bn	49%	2.1 yr
Apartment	254	23	₦8.79m	₦8.79m	23%	4.9 yr
Commercial Corridor	218	142	₦724m	₦724m	43%	2.4 yr
Educational Facility	202	156	₦222m	₦222m	71%	1.4 yr
School	127	96	₦128m	₦128m	69%	1.6 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	228,879	17,548	₦17.4bn	₦17bn
Industrial	166	160	₦436m	₦436m

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	226,821	16,896	₦13.6bn	₦13.2bn	5%	16.6 yr
SME High	1,537	330	₦2.78bn	₦2.78bn	35%	3.1 yr
Enterprise	687	482	₦1.47bn	₦1.46bn	51%	2.1 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	161,680	6,352	₦587m	₦587m
2.0	23,755	3,762	₦3.53bn	₦3.37bn
3.0	19,905	4,640	₦9.08bn	₦8.91bn
1.0	12,702	1,557	₦928m	₦820m
4.0	10,028	1,206	₦1.31bn	₦1.31bn
5.0	816	140	₦879m	₦879m
6.0	159	51	₦1.52bn	₦1.52bn