Abia State

Rooftop solar in Osisioma Ngwa, Abia: what the roofs are worth

Osisioma Ngwa has 109,977 buildings with a viable rooftop and 2.66 GWp of roof capacity. 39% run a generator, and together they spend ₦76.3bn a year on energy.

Viable buildings

109,977

Usable roof area

11.8 km²

2.66 GWp roof capacity

Energy spend

₦76.3bn/yr

70.1 GWh/yr burned on generators

Median payback

4.6 yr

Median IRR 25% (cash saved)

The savings bracket for Osisioma Ngwa

Approach B

Cash saved

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

Current energy spend₦76.3bn/yr

Year-one cash saved₦75.1bn

Lifetime cash saved₦3.93tn

NPV₦568bn

Median IRR25%

Median payback4.6 yr

Unlocked energy60.4 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity273 MWp

Capex₦261bn

Year-one energy value₦172bn

Lifetime energy value₦8.03tn

NPV₦1.29tn

Median IRR77%

Median payback1.4 yr

Three ways to size Osisioma Ngwa'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: 273 MWp
Capital cost: ₦261bn
Year 1 savings: ₦172bn/yr
NPV: ₦1.29tn
Median IRR: 77%
Median payback: 1.4 yr

The odds a rooftop in Osisioma Ngwa pays back quickly

Of the 109,616 buildings in Osisioma Ngwa with a modelled payback, 70.1% pay back inside five years and 36.7% inside three.

Create a free account

How much of Osisioma Ngwa's demand actually gets met

Buildings in Osisioma Ngwa consume 157 GWh/yr but want 217 GWh/yr. The 28% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

Create a free account

Electricity billing bands in Osisioma Ngwa

Loading band economics…

How many rooftops in Osisioma Ngwa 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 109,616 buildings with a modelled result out of 109,977 in Osisioma Ngwa. 94,577 clear a positive NPV.

Payback

Under 3 years40,241 (37%)

Under 5 years76,852 (70%)

Under 7 years94,426 (86%)

Under 10 years101,396 (93%)

Return (IRR)

Above 10%100,121 (91%)

Above 15%94,577 (86%)

Above 20%82,698 (75%)

Above 25%43,736 (40%)

CO₂ avoided

137 kt/yr

Fuel avoided

30.8 million litres/yr

Energy unlocked

60.4 GWh/yr

Demand that is suppressed today

People served

261k

What hardware costs right now

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

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 Osisioma Ngwa

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
A	43,445	21,065	₦41.8bn	₦41.1bn	25%	4.4 yr
B	25,521	12,946	₦18bn	₦17.6bn	33%	3.4 yr
C	16,576	5,033	₦8.8bn	₦8.78bn	23%	4.6 yr
D	14,811	2,626	₦5.59bn	₦5.35bn	21%	5.1 yr
E	9,624	1,094	₦2.24bn	₦2.23bn	21%	5.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	105,217	39,049	₦34.5bn	₦34.3bn	25%	4.6 yr
Commercial General	2,271	1,765	₦17.4bn	₦17.2bn	43%	2.6 yr
Anchor	876	667	₦20.9bn	₦20.2bn	51%	2.1 yr
Commercial Retail	712	595	₦265m	₦265m	41%	2.6 yr
Industrial	458	380	₦2.45bn	₦2.39bn	51%	2.1 yr
Worship	330	240	₦396m	₦396m	53%	1.9 yr
Filling Station	79	51	₦139m	₦139m	39%	2.6 yr
Hospitality	28	14	₦285m	₦263m	33%	3.1 yr
Mall Retail	3	1	₦4.79m	₦4.79m	35%	3.1 yr
Productive Use	3	2	₦4.72m	₦4.72m	41%	2.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	40,319	16,133	₦19.1bn	₦19bn	25%	4.4 yr
50 100m2	25,397	9,160	₦3.32bn	₦3.27bn	23%	4.6 yr
Under 30m2	18,040	6,429	₦819m	₦785m	17%	6.6 yr
30 50m2	13,657	4,916	₦1.01bn	₦996m	19%	5.6 yr
250 1000m2	12,233	5,893	₦27.1bn	₦26.8bn	25%	4.4 yr
Over 1000m2	331	233	₦24.9bn	₦24.2bn	47%	2.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	77,985	37,152	₦61.8bn	₦61bn	25%	4.4 yr
Urban	27,266	3,966	₦9.79bn	₦9.58bn	21%	5.1 yr
Unclassified	4,726	1,646	₦4.72bn	₦4.57bn	25%	4.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	23,222	6,616	₦2.57bn	₦2.5bn	23%	4.9 yr
Residential Informal	23,011	10,340	₦9.7bn	₦9.7bn	25%	4.4 yr
Residential	19,144	6,291	₦15.9bn	₦15.7bn	25%	4.4 yr
Residential Formal	18,885	8,813	₦4.54bn	₦4.54bn	25%	4.4 yr
Shed	15,976	4,474	₦628m	₦628m	15%	7.1 yr
Apartment	3,839	1,947	₦919m	₦919m	37%	2.9 yr
Duplex	1,084	539	₦230m	₦230m	25%	4.4 yr
Commercial	825	672	₦7.39bn	₦7.33bn	43%	2.6 yr
Institutional	790	617	₦20.5bn	₦19.9bn	43%	2.6 yr
Kiosk Shop	712	594	₦232m	₦232m	41%	2.6 yr
Commercial Corridor	554	432	₦5.65bn	₦5.51bn	45%	2.4 yr
Educational Facility	288	216	₦748m	₦748m	57%	1.9 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	107,040	40,582	₦55.9bn	₦55.1bn
Industrial	2,546	1,932	₦20bn	₦19.6bn
Retail	391	250	₦417m	₦417m

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	107,295	40,660	₦40.1bn	₦39.9bn	25%	4.6 yr
SME High	1,479	1,169	₦13.4bn	₦13.2bn	43%	2.4 yr
Enterprise	1,203	935	₦22.8bn	₦22bn	51%	2.1 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	40,383	13,999	₦30bn	₦29.7bn
4.0	38,150	18,555	₦31.4bn	₦30.7bn
0.0	15,501	4,264	₦601m	₦601m
2.0	12,706	4,307	₦1.65bn	₦1.55bn
1.0	2,054	716	₦174m	₦172m
5.0	842	632	₦3.73bn	₦3.64bn
6.0	341	291	₦8.82bn	₦8.73bn