Nasarawa State

Rooftop solar in Akwanga, Nasarawa: what the roofs are worth

Akwanga has 71,655 buildings with a viable rooftop and 1.08 GWp of roof capacity. 19% run a generator, and together they spend ₦20bn a year on energy.

Viable buildings

71,655

Usable roof area

4.84 km²

1.08 GWp roof capacity

Energy spend

₦20bn/yr

17.3 GWh/yr burned on generators

Median payback

4.4 yr

Median IRR 25% (cash saved)

The savings bracket for Akwanga

Approach B

Cash saved

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

Current energy spend₦20bn/yr

Year-one cash saved₦19.8bn

Lifetime cash saved₦1.09tn

NPV₦163bn

Median IRR25%

Median payback4.4 yr

Unlocked energy21.2 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity98.7 MWp

Capex₦101bn

Year-one energy value₦91.3bn

Lifetime energy value₦4.34tn

NPV₦732bn

Median IRR93%

Median payback1.1 yr

Three ways to size Akwanga'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: 98.7 MWp
Capital cost: ₦101bn
Year 1 savings: ₦91.3bn/yr
NPV: ₦732bn
Median IRR: 93%
Median payback: 1.1 yr

The odds a rooftop in Akwanga pays back quickly

Of the 70,736 buildings in Akwanga with a modelled payback, 56.1% pay back inside five years and 18.7% inside three.

Create a free account

How much of Akwanga's demand actually gets met

Buildings in Akwanga consume 36.9 GWh/yr but want 58.1 GWh/yr. The 36% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

Create a free account

Electricity billing bands in Akwanga

Loading band economics…

How many rooftops in Akwanga 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 70,736 buildings with a modelled result out of 71,655 in Akwanga. 49,125 clear a positive NPV.

Payback

Under 3 years13,260 (19%)

Under 5 years39,682 (56%)

Under 7 years49,144 (69%)

Under 10 years56,753 (80%)

Return (IRR)

Above 10%54,622 (76%)

Above 15%49,125 (69%)

Above 20%42,519 (59%)

Above 25%34,535 (48%)

CO₂ avoided

39.2 kt/yr

Fuel avoided

9 million litres/yr

Energy unlocked

21.2 GWh/yr

Demand that is suppressed today

People served

217k

What hardware costs right now

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

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 Akwanga

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
E	22,513	2,609	₦4.74bn	₦4.7bn	17%	5.9 yr
B	18,395	3,610	₦3.2bn	₦3.18bn	25%	4.1 yr
D	17,850	2,588	₦5.43bn	₦5.41bn	21%	5.1 yr
C	12,897	4,935	₦6.58bn	₦6.54bn	29%	3.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	68,595	11,642	₦13.2bn	₦13.1bn	23%	4.6 yr
Commercial General	1,351	778	₦3.23bn	₦3.23bn	43%	2.6 yr
Commercial Retail	630	367	₦112m	₦112m	37%	2.9 yr
Worship	561	512	₦370m	₦370m	63%	1.6 yr
Anchor	469	421	₦2.95bn	₦2.95bn	61%	1.6 yr
Industrial	22	18	₦44.7m	₦44.4m	59%	1.6 yr
Hospitality	17	2	₦38.2m	₦38.2m	35%	3.1 yr
Filling Station	6	2	₦2.04m	₦2.04m	37%	2.9 yr
Mall Retail	2	0	₦783k	₦783k	35%	2.9 yr
Productive Use	2	0	₦2.17m	₦2.17m	37%	2.9 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
50 100m2	19,114	3,459	₦2.47bn	₦2.46bn	27%	4.1 yr
Under 30m2	18,799	2,429	₦303m	₦302m	7%	14.1 yr
100 250m2	17,992	4,652	₦8.14bn	₦8.03bn	29%	3.9 yr
30 50m2	12,888	2,077	₦531m	₦529m	13%	7.6 yr
250 1000m2	2,798	1,086	₦6.68bn	₦6.68bn	29%	3.9 yr
Over 1000m2	64	39	₦1.82bn	₦1.82bn	59%	1.9 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	24,650	7,233	₦7.01bn	₦6.99bn	27%	3.9 yr
Unclassified	22,384	2,146	₦4.45bn	₦4.4bn	11%	7.4 yr
Rural	12,309	1,726	₦3.58bn	₦3.54bn	21%	4.9 yr
Urban	7,781	2,212	₦3.9bn	₦3.9bn	27%	3.9 yr
Dense Urban	4,531	425	₦1.02bn	₦991m	21%	5.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	22,057	2,444	₦314m	₦314m	9%	13.1 yr
Residential Small	19,091	3,896	₦2.74bn	₦2.7bn	27%	3.9 yr
Residential Formal	14,281	2,026	₦704m	₦704m	23%	4.6 yr
Residential	10,314	3,017	₦9.31bn	₦9.23bn	29%	3.9 yr
Residential Informal	2,696	243	₦117m	₦117m	23%	4.6 yr
Commercial Corridor	692	285	₦1.31bn	₦1.31bn	37%	2.9 yr
Kiosk Shop	630	367	₦112m	₦112m	37%	2.9 yr
Institutional	437	406	₦2.11bn	₦2.11bn	59%	1.9 yr
Commercial	291	216	₦1.1bn	₦1.1bn	53%	1.9 yr
Worship Center	196	176	₦97.8m	₦97.8m	67%	1.6 yr
Place Of Worship	184	164	₦59.4m	₦59.4m	67%	1.6 yr
Educational Facility	138	130	₦384m	₦384m	87%	1.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	71,655	13,742	₦20bn	₦19.8bn

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	70,169	12,806	₦14.5bn	₦14.4bn	23%	4.6 yr
SME High	1,001	503	₦2.43bn	₦2.43bn	37%	2.9 yr
Enterprise	485	433	₦2.97bn	₦2.97bn	61%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	21,853	2,469	₦314m	₦314m
2.0	16,946	4,116	₦4.42bn	₦4.31bn
4.0	12,175	1,866	₦2.31bn	₦2.31bn
3.0	11,279	3,669	₦11.4bn	₦11.4bn
1.0	9,162	1,597	₦967m	₦967m
5.0	224	25	₦477m	₦477m
6.0	16	0	₦57.3m	₦57.3m