Taraba State

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

Zing has 88,131 buildings with a viable rooftop and 366 MWp of roof capacity. 6% run a generator, and together they spend ₦8.56bn a year on energy.

Viable buildings

88,131

Usable roof area

1.66 km²

366 MWp roof capacity

Energy spend

₦8.56bn/yr

7.29 GWh/yr burned on generators

Median payback

17.9 yr

Median IRR 5% (cash saved)

The savings bracket for Zing

Approach B

Cash saved

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

Current energy spend₦8.56bn/yr

Year-one cash saved₦8.44bn

Lifetime cash saved₦445bn

NPV₦65.5bn

Median IRR5%

Median payback17.9 yr

Unlocked energy6.13 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity43.5 MWp

Capex₦46.4bn

Year-one energy value₦44.3bn

Lifetime energy value₦2.09tn

NPV₦357bn

Median IRR93%

Median payback1.1 yr

Three ways to size Zing'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: 43.5 MWp
Capital cost: ₦46.4bn
Year 1 savings: ₦44.3bn/yr
NPV: ₦357bn
Median IRR: 93%
Median payback: 1.1 yr

The odds a rooftop in Zing pays back quickly

Of the 85,791 buildings in Zing with a modelled payback, 16.3% pay back inside five years and 7.1% inside three.

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How much of Zing's demand actually gets met

Buildings in Zing consume 15 GWh/yr but want 21.1 GWh/yr. The 29% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Zing

Loading band economics…

How many rooftops in Zing 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 85,791 buildings with a modelled result out of 88,131 in Zing. 18,937 clear a positive NPV.

Payback

Under 3 years6,055 (7%)

Under 5 years13,989 (16%)

Under 7 years19,015 (22%)

Under 10 years24,779 (29%)

Return (IRR)

Above 10%23,877 (27%)

Above 15%18,937 (21%)

Above 20%14,829 (17%)

Above 25%12,702 (14%)

CO₂ avoided

15.5 kt/yr

Fuel avoided

4.04 million litres/yr

Energy unlocked

6.13 GWh/yr

Demand that is suppressed today

People served

151k

What hardware costs right now

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

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 Zing

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	28,904	1,027	₦865m	₦862m	3%	18.9 yr
E	25,894	943	₦940m	₦892m	3%	18.9 yr
C	15,987	969	₦1.31bn	₦1.29bn	5%	15.9 yr
B	14,357	2,169	₦5.39bn	₦5.35bn	19%	5.4 yr
A	2,989	4	₦49.9m	₦49.9m	11%	7.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	84,371	3,959	₦6.28bn	₦6.21bn	5%	17.9 yr
Commercial Retail	1,961	418	₦48.8m	₦48.8m	33%	3.4 yr
Commercial General	1,203	249	₦623m	₦623m	37%	2.9 yr
Anchor	327	260	₦1.53bn	₦1.49bn	59%	1.9 yr
Worship	220	198	₦35.8m	₦35.8m	53%	1.9 yr
Industrial	45	28	₦37.9m	₦37.6m	61%	1.6 yr
Filling Station	4	0	₦253k	₦253k	35%	2.9 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	72,313	2,870	₦346m	₦341m	3%	18.6 yr
50 100m2	6,058	662	₦860m	₦857m	31%	3.6 yr
30 50m2	5,739	525	₦191m	₦188m	11%	8.4 yr
100 250m2	3,463	779	₦2.59bn	₦2.56bn	31%	3.6 yr
250 1000m2	533	255	₦3.07bn	₦2.99bn	39%	2.9 yr
Over 1000m2	25	21	₦1.51bn	₦1.51bn	77%	1.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Unclassified	38,062	756	₦2.23bn	₦2.19bn	3%	19.4 yr
Urban	23,399	1,461	₦1.63bn	₦1.6bn	5%	16.6 yr
Urban Centre	15,700	1,985	₦4.22bn	₦4.18bn	19%	5.6 yr
Rural	10,970	910	₦482m	₦482m	5%	18.1 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	68,471	2,180	₦258m	₦258m	3%	18.6 yr
Residential Small	6,019	771	₦996m	₦991m	31%	3.6 yr
Residential Informal	5,057	31	₦112m	₦112m	15%	6.6 yr
Residential	4,807	976	₦4.91bn	₦4.85bn	27%	4.1 yr
Kiosk Shop	1,961	418	₦48.8m	₦48.8m	33%	3.4 yr
Commercial	699	44	₦170m	₦170m	37%	2.9 yr
Institutional	291	235	₦1.08bn	₦1.08bn	53%	2.1 yr
Commercial Corridor	230	9	₦104m	₦104m	37%	2.9 yr
Educational Facility	126	105	₦167m	₦167m	81%	1.4 yr
School	81	61	₦57m	₦57m	69%	1.6 yr
Worship Center	77	70	₦13.4m	₦13.4m	59%	1.9 yr
Place Of Worship	66	59	₦4.68m	₦4.68m	51%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	88,131	5,112	₦8.56bn	₦8.44bn

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	86,838	4,778	₦6.74bn	₦6.67bn	5%	17.9 yr
SME High	933	53	₦274m	₦274m	37%	2.9 yr
Enterprise	360	281	₦1.55bn	₦1.5bn	59%	1.9 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	68,573	2,258	₦261m	₦261m
2.0	7,974	911	₦1.52bn	₦1.51bn
3.0	5,004	987	₦6.03bn	₦5.93bn
1.0	4,245	942	₦309m	₦306m
4.0	1,599	14	₦232m	₦232m
5.0	677	0	₦150m	₦150m
6.0	59	0	₦58m	₦58m