Gombe State

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

Akko has 308,767 buildings with a viable rooftop and 2.66 GWp of roof capacity. 7% run a generator, and together they spend ₦34.1bn a year on energy.

Viable buildings

308,767

Usable roof area

12 km²

2.66 GWp roof capacity

Energy spend

₦34.1bn/yr

33.3 GWh/yr burned on generators

Median payback

7.9 yr

Median IRR 13% (cash saved)

The savings bracket for Akko

Approach B

Cash saved

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

Current energy spend₦34.1bn/yr

Year-one cash saved₦33.7bn

Lifetime cash saved₦1.85tn

NPV₦270bn

Median IRR13%

Median payback7.9 yr

Unlocked energy36.5 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity163 MWp

Capex₦171bn

Year-one energy value₦147bn

Lifetime energy value₦6.98tn

NPV₦1.17tn

Median IRR97%

Median payback1.1 yr

Three ways to size Akko'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: 163 MWp
Capital cost: ₦171bn
Year 1 savings: ₦147bn/yr
NPV: ₦1.17tn
Median IRR: 97%
Median payback: 1.1 yr

The odds a rooftop in Akko pays back quickly

Of the 299,863 buildings in Akko with a modelled payback, 29.7% pay back inside five years and 7.3% inside three.

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How much of Akko's demand actually gets met

Buildings in Akko consume 73.6 GWh/yr but want 110 GWh/yr. The 33% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Akko

Loading band economics…

How many rooftops in Akko 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 299,863 buildings with a modelled result out of 308,767 in Akko. 138,642 clear a positive NPV.

Payback

Under 3 years22,030 (7%)

Under 5 years89,112 (30%)

Under 7 years139,127 (46%)

Under 10 years177,477 (59%)

Return (IRR)

Above 10%168,264 (54%)

Above 15%138,642 (45%)

Above 20%101,972 (33%)

Above 25%68,159 (22%)

CO₂ avoided

64.7 kt/yr

Fuel avoided

12.7 million litres/yr

Energy unlocked

36.5 GWh/yr

Demand that is suppressed today

People served

369k

What hardware costs right now

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

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 Akko

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
A	117,341	10,108	₦12.3bn	₦12bn	19%	5.4 yr
C	62,402	3,269	₦8.02bn	₦7.96bn	7%	14.6 yr
D	51,365	1,769	₦2.34bn	₦2.34bn	7%	15.1 yr
E	40,711	1,824	₦5.23bn	₦5.18bn	7%	14.9 yr
B	36,948	3,759	₦6.2bn	₦6.19bn	19%	5.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	301,144	16,838	₦12.2bn	₦12.2bn	11%	8.1 yr
Worship	2,423	1,949	₦405m	₦405m	57%	1.9 yr
Commercial General	2,215	764	₦6.61bn	₦6.5bn	37%	2.9 yr
Commercial Retail	1,694	450	₦224m	₦224m	37%	2.9 yr
Anchor	1,055	635	₦14.4bn	₦14.2bn	55%	1.9 yr
Industrial	174	73	₦133m	₦131m	41%	2.6 yr
Filling Station	40	17	₦46.2m	₦46.2m	37%	2.9 yr
Hospitality	15	1	₦6.95m	₦6.95m	37%	2.9 yr
Mall Retail	4	1	₦3.88m	₦3.88m	39%	2.9 yr
Productive Use	3	1	₦1.05m	₦1.05m	39%	2.9 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	148,473	7,088	₦998m	₦972m	7%	15.6 yr
30 50m2	64,509	3,979	₦1.18bn	₦1.16bn	15%	7.1 yr
50 100m2	61,750	4,815	₦2.83bn	₦2.82bn	23%	4.9 yr
100 250m2	28,835	3,623	₦6.21bn	₦6.21bn	29%	3.6 yr
250 1000m2	4,959	1,097	₦7.92bn	₦7.86bn	31%	3.6 yr
Over 1000m2	241	127	₦14.9bn	₦14.7bn	47%	2.1 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	91,449	5,086	₦8.8bn	₦8.57bn	19%	5.4 yr
Unclassified	82,775	3,203	₦9.98bn	₦9.9bn	7%	15.6 yr
Urban	60,641	4,567	₦9.53bn	₦9.5bn	11%	8.4 yr
Dense Urban	40,996	5,927	₦4.32bn	₦4.3bn	19%	5.4 yr
Rural	32,906	1,946	₦1.44bn	₦1.44bn	7%	14.1 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	140,262	4,611	₦717m	₦717m	7%	15.1 yr
Residential Informal	52,253	2,507	₦1.46bn	₦1.46bn	17%	5.6 yr
Residential Small	50,076	5,325	₦2.59bn	₦2.56bn	25%	4.4 yr
Residential Formal	37,347	1,689	₦607m	₦607m	17%	5.9 yr
Residential	19,775	2,635	₦6.81bn	₦6.76bn	21%	5.1 yr
Kiosk Shop	1,692	450	₦222m	₦222m	37%	2.9 yr
Institutional	1,471	1,059	₦14.1bn	₦14bn	55%	1.9 yr
Commercial	947	362	₦4.61bn	₦4.55bn	39%	2.9 yr
Apartment	933	49	₦26.7m	₦26.7m	25%	4.4 yr
Worship Center	815	655	₦104m	₦104m	61%	1.6 yr
Place Of Worship	805	643	₦63.7m	₦63.7m	57%	1.9 yr
Duplex	461	20	₦12.1m	₦12.1m	25%	4.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	308,669	20,641	₦32.7bn	₦32.5bn
Industrial	95	88	₦1.33bn	₦1.25bn
Commercial	2	0	₦40.9k	₦40.9k
Farmland	1	0	₦1.68k	₦1.68k

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	306,115	19,637	₦14.1bn	₦14bn	11%	7.9 yr
SME High	1,463	396	₦5.42bn	₦5.31bn	39%	2.9 yr
Enterprise	1,189	696	₦14.5bn	₦14.4bn	55%	1.9 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	137,920	4,941	₦717m	₦717m
4.0	50,330	2,300	₦3.77bn	₦3.74bn
2.0	49,049	4,439	₦2.87bn	₦2.86bn
3.0	47,701	6,061	₦21bn	₦20.9bn
1.0	22,809	2,736	₦939m	₦913m
5.0	796	197	₦2.13bn	₦2.13bn
6.0	162	55	₦2.62bn	₦2.5bn