Katsina State

Rooftop solar in Funtua, Katsina: what the roofs are worth

Funtua has 134,201 buildings with a viable rooftop and 1.31 GWp of roof capacity. 9% run a generator, and together they spend ₦28.4bn a year on energy.

Viable buildings

134,201

Usable roof area

5.89 km²

1.31 GWp roof capacity

Energy spend

₦28.4bn/yr

25.8 GWh/yr burned on generators

Median payback

5.9 yr

Median IRR 19% (cash saved)

The savings bracket for Funtua

Approach B

Cash saved

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

Current energy spend₦28.4bn/yr

Year-one cash saved₦28.1bn

Lifetime cash saved₦1.54tn

NPV₦231bn

Median IRR19%

Median payback5.9 yr

Unlocked energy26.1 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity112 MWp

Capex₦116bn

Year-one energy value₦103bn

Lifetime energy value₦4.9tn

NPV₦827bn

Median IRR81%

Median payback1.4 yr

Three ways to size Funtua'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: 112 MWp
Capital cost: ₦116bn
Year 1 savings: ₦103bn/yr
NPV: ₦827bn
Median IRR: 81%
Median payback: 1.4 yr

The odds a rooftop in Funtua pays back quickly

Of the 130,654 buildings in Funtua with a modelled payback, 39.4% pay back inside five years and 9.8% inside three.

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How much of Funtua's demand actually gets met

Buildings in Funtua consume 56.5 GWh/yr but want 82.6 GWh/yr. The 32% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Funtua

Loading band economics…

How many rooftops in Funtua 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 130,654 buildings with a modelled result out of 134,201 in Funtua. 79,355 clear a positive NPV.

Payback

Under 3 years12,801 (10%)

Under 5 years51,525 (39%)

Under 7 years79,711 (61%)

Under 10 years101,608 (78%)

Return (IRR)

Above 10%96,862 (72%)

Above 15%79,355 (59%)

Above 20%58,637 (44%)

Above 25%40,989 (31%)

CO₂ avoided

53.1 kt/yr

Fuel avoided

11.8 million litres/yr

Energy unlocked

26.1 GWh/yr

Demand that is suppressed today

People served

257k

What hardware costs right now

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

Solar panels

₦250

₦/W

Inverters

₦127,419

₦/kVA

Batteries

₦177,500

₦/kWh

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Building mix in Funtua

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
A	61,937	3,622	₦10.3bn	₦10.2bn	19%	5.6 yr
C	25,175	1,897	₦4.26bn	₦4.26bn	19%	5.9 yr
B	20,351	3,889	₦9.57bn	₦9.44bn	19%	5.4 yr
D	13,394	1,389	₦2.49bn	₦2.47bn	9%	9.6 yr
E	13,344	1,004	₦1.76bn	₦1.76bn	9%	9.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	130,198	9,529	₦15bn	₦14.7bn	17%	5.9 yr
Commercial General	1,815	867	₦4.71bn	₦4.71bn	39%	2.9 yr
Commercial Retail	1,642	1,123	₦267m	₦267m	45%	2.4 yr
Anchor	434	220	₦8.39bn	₦8.39bn	49%	2.1 yr
Worship	82	46	₦24.9m	₦24.9m	39%	2.6 yr
Industrial	18	8	₦18m	₦18m	41%	2.6 yr
Hospitality	6	6	₦25.4m	₦25.4m	39%	2.6 yr
Filling Station	4	2	₦5.31m	₦5.31m	39%	2.1 yr
Mall Retail	2	0	₦308k	₦308k	37%	2.9 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	50,439	3,492	₦493m	₦493m	9%	13.1 yr
30 50m2	33,335	2,597	₦708m	₦708m	17%	6.4 yr
50 100m2	32,691	2,774	₦2.4bn	₦2.31bn	25%	4.4 yr
100 250m2	15,325	2,235	₦6.9bn	₦6.8bn	31%	3.6 yr
250 1000m2	2,317	643	₦8.02bn	₦7.92bn	31%	3.4 yr
Over 1000m2	94	60	₦9.88bn	₦9.88bn	61%	1.9 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	73,978	6,703	₦12.9bn	₦12.8bn	19%	5.6 yr
Urban	25,834	3,494	₦11bn	₦10.9bn	19%	5.6 yr
Unclassified	13,214	558	₦2.32bn	₦2.25bn	9%	9.9 yr
Dense Urban	11,483	919	₦1.91bn	₦1.91bn	19%	5.6 yr
Rural	9,692	127	₦285m	₦285m	9%	9.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	42,890	3,509	₦463m	₦463m	11%	9.1 yr
Residential Informal	42,209	1,707	₦1.51bn	₦1.51bn	19%	5.4 yr
Residential Formal	18,923	0	₦170m	₦170m	15%	6.6 yr
Residential Small	18,379	2,532	₦2.03bn	₦1.94bn	29%	3.6 yr
Residential	7,732	1,781	₦10.8bn	₦10.6bn	31%	3.4 yr
Kiosk Shop	1,642	1,123	₦267m	₦267m	45%	2.4 yr
Commercial	906	592	₦2.62bn	₦2.62bn	43%	2.4 yr
Commercial Corridor	587	138	₦1.28bn	₦1.28bn	39%	2.9 yr
Institutional	252	136	₦8.19bn	₦8.19bn	41%	2.6 yr
Educational Facility	147	69	₦130m	₦130m	49%	2.1 yr
School	127	51	₦61.2m	₦61.2m	47%	2.1 yr
Unknown	96	32	₦456m	₦456m	33%	3.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	134,126	11,729	₦27.2bn	₦26.9bn
Farmyard	72	72	₦1.15bn	₦1.15bn
Farmland	3	0	₦3.83m	₦3.83m

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	132,258	10,848	₦16.1bn	₦15.8bn	17%	5.9 yr
SME High	1,504	733	₦3.92bn	₦3.92bn	39%	2.6 yr
Enterprise	439	220	₦8.39bn	₦8.39bn	49%	2.1 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	40,450	3,528	₦448m	₦448m
4.0	30,246	1,002	₦3.99bn	₦3.93bn
3.0	30,171	3,565	₦18.7bn	₦18.5bn
2.0	25,902	2,576	₦1.94bn	₦1.93bn
1.0	6,479	667	₦331m	₦329m
5.0	847	406	₦1.68bn	₦1.68bn
6.0	106	57	₦1.33bn	₦1.33bn