Gombe State

Rooftop solar in Funakaye, Gombe: what the roofs are worth

Funakaye has 105,283 buildings with a viable rooftop and 630 MWp of roof capacity. 9% run a generator, and together they spend ₦26.6bn a year on energy.

Viable buildings

105,283

Usable roof area

2.87 km²

630 MWp roof capacity

Energy spend

₦26.6bn/yr

22.8 GWh/yr burned on generators

Median payback

7.1 yr

Median IRR 15% (cash saved)

The savings bracket for Funakaye

Approach B

Cash saved

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

Current energy spend₦26.6bn/yr

Year-one cash saved₦25.5bn

Lifetime cash saved₦1.31tn

NPV₦199bn

Median IRR15%

Median payback7.1 yr

Unlocked energy14.2 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity85.9 MWp

Capex₦92.3bn

Year-one energy value₦90.4bn

Lifetime energy value₦4.23tn

NPV₦726bn

Median IRR101%

Median payback1.1 yr

Three ways to size Funakaye'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: 85.9 MWp
Capital cost: ₦92.3bn
Year 1 savings: ₦90.4bn/yr
NPV: ₦726bn
Median IRR: 101%
Median payback: 1.1 yr

The odds a rooftop in Funakaye pays back quickly

Of the 104,938 buildings in Funakaye with a modelled payback, 33.2% pay back inside five years and 9.2% inside three.

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How much of Funakaye's demand actually gets met

Buildings in Funakaye consume 45.5 GWh/yr but want 59.7 GWh/yr. The 24% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Funakaye

Loading band economics…

How many rooftops in Funakaye 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 104,938 buildings with a modelled result out of 105,283 in Funakaye. 51,498 clear a positive NPV.

Payback

Under 3 years9,632 (9%)

Under 5 years34,830 (33%)

Under 7 years51,651 (49%)

Under 10 years62,101 (59%)

Return (IRR)

Above 10%59,468 (56%)

Above 15%51,498 (49%)

Above 20%39,165 (37%)

Above 25%28,916 (27%)

CO₂ avoided

44.8 kt/yr

Fuel avoided

12.3 million litres/yr

Energy unlocked

14.2 GWh/yr

Demand that is suppressed today

People served

320k

What hardware costs right now

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

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 Funakaye

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
C	24,515	1,619	₦3.28bn	₦2.83bn	7%	14.6 yr
A	23,414	2,506	₦11.1bn	₦11bn	21%	5.1 yr
D	21,299	1,192	₦2.53bn	₦2.35bn	7%	15.1 yr
B	19,233	3,226	₦6.29bn	₦6.25bn	25%	4.6 yr
E	16,822	1,123	₦3.41bn	₦3.04bn	7%	14.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	103,255	7,970	₦20.2bn	₦19.2bn	13%	7.4 yr
Worship	956	857	₦170m	₦170m	57%	1.9 yr
Commercial General	441	345	₦1.37bn	₦1.34bn	55%	1.9 yr
Anchor	387	309	₦4.73bn	₦4.65bn	65%	1.6 yr
Industrial	190	148	₦154m	₦154m	67%	1.6 yr
Commercial Retail	49	34	₦24.3m	₦24.3m	67%	1.6 yr
Filling Station	3	1	₦5.02m	₦5.02m	37%	2.9 yr
Mall Retail	2	2	₦1.17m	₦1.17m	67%	1.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	63,222	4,074	₦760m	₦759m	7%	14.9 yr
30 50m2	22,351	2,092	₦1.27bn	₦1.21bn	21%	5.4 yr
50 100m2	14,768	1,840	₦2.83bn	₦2.67bn	31%	3.6 yr
100 250m2	3,950	1,064	₦5.97bn	₦5.45bn	31%	3.6 yr
250 1000m2	921	540	₦10.1bn	₦9.82bn	55%	1.9 yr
Over 1000m2	71	56	₦5.7bn	₦5.6bn	57%	1.9 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	33,355	4,735	₦11.9bn	₦11.8bn	23%	4.9 yr
Urban	29,005	2,666	₦8.41bn	₦8.02bn	9%	13.4 yr
Unclassified	22,033	1,094	₦3.75bn	₦3.23bn	5%	16.1 yr
Rural	13,249	1,096	₦2.32bn	₦2.2bn	7%	13.9 yr
Dense Urban	7,641	75	₦284m	₦284m	17%	6.1 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	56,679	2,481	₦392m	₦392m	7%	15.1 yr
Residential Small	14,483	1,942	₦3.49bn	₦3.34bn	31%	3.6 yr
Residential	14,082	1,938	₦13.8bn	₦12.9bn	21%	4.9 yr
Residential Formal	12,724	1,075	₦401m	₦401m	21%	5.1 yr
Residential Informal	5,126	529	₦2.13bn	₦2.13bn	23%	4.6 yr
Institutional	704	599	₦4.6bn	₦4.53bn	55%	1.9 yr
Place Of Worship	322	290	₦37.5m	₦37.5m	57%	1.9 yr
Worship Center	317	284	₦56.8m	₦56.8m	61%	1.6 yr
Industrial Site	169	136	₦57m	₦57m	69%	1.6 yr
Agricultural	136	3	₦1.59m	₦1.59m	7%	14.6 yr
Educational Facility	123	105	₦249m	₦249m	83%	1.1 yr
School	98	84	₦118m	₦118m	81%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	104,746	9,170	₦23.2bn	₦22.1bn
Industrial	366	325	₦3.39bn	₦3.39bn
Commercial	171	171	₦58.3m	₦58.3m

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	104,684	9,183	₦21bn	₦20bn	15%	7.4 yr
Enterprise	556	444	₦4.79bn	₦4.71bn	67%	1.6 yr
SME High	43	39	₦787m	₦759m	69%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	57,080	2,719	₦405m	₦405m
2.0	17,653	2,291	₦2.91bn	₦2.75bn
4.0	11,358	1,006	₦1.76bn	₦1.76bn
3.0	10,697	2,357	₦20.3bn	₦19.5bn
1.0	8,492	1,290	₦694m	₦648m
5.0	3	3	₦522m	₦493m