Imo State

Rooftop solar in Ngor-Okpala, Imo: what the roofs are worth

Ngor-Okpala has 61,667 buildings with a viable rooftop and 1.33 GWp of roof capacity. 54% run a generator, and together they spend ₦47.8bn a year on energy.

Viable buildings

61,667

Usable roof area

5.92 km²

1.33 GWp roof capacity

Energy spend

₦47.8bn/yr

44.9 GWh/yr burned on generators

Median payback

1.9 yr

Median IRR 57% (cash saved)

The savings bracket for Ngor-Okpala

Approach B

Cash saved

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

Current energy spend₦47.8bn/yr

Year-one cash saved₦47.3bn

Lifetime cash saved₦2.45tn

NPV₦386bn

Median IRR57%

Median payback1.9 yr

Unlocked energy37.5 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity164 MWp

Capex₦162bn

Year-one energy value₦138bn

Lifetime energy value₦6.54tn

NPV₦1.1tn

Median IRR97%

Median payback1.1 yr

Three ways to size Ngor-Okpala'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: 164 MWp
Capital cost: ₦162bn
Year 1 savings: ₦138bn/yr
NPV: ₦1.1tn
Median IRR: 97%
Median payback: 1.1 yr

The odds a rooftop in Ngor-Okpala pays back quickly

Of the 61,533 buildings in Ngor-Okpala with a modelled payback, 72.8% pay back inside five years and 54.3% inside three.

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How much of Ngor-Okpala's demand actually gets met

Buildings in Ngor-Okpala consume 65.2 GWh/yr but want 103 GWh/yr. The 37% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Ngor-Okpala

Loading band economics…

How many rooftops in Ngor-Okpala 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 61,533 buildings with a modelled result out of 61,667 in Ngor-Okpala. 51,291 clear a positive NPV.

Payback

Under 3 years33,397 (54%)

Under 5 years44,805 (73%)

Under 7 years51,228 (83%)

Under 10 years55,792 (91%)

Return (IRR)

Above 10%54,659 (89%)

Above 15%51,291 (83%)

Above 20%46,660 (76%)

Above 25%34,906 (57%)

CO₂ avoided

85.4 kt/yr

Fuel avoided

25.6 million litres/yr

Energy unlocked

37.5 GWh/yr

Demand that is suppressed today

People served

265k

What hardware costs right now

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

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 Ngor-Okpala

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	24,769	13,828	₦18.6bn	₦18.3bn	63%	1.6 yr
E	24,466	12,715	₦17.3bn	₦17.1bn	53%	1.9 yr
C	12,416	6,872	₦11.9bn	₦11.8bn	53%	1.9 yr
B	16	16	₦42.2m	₦42.2m	47%	2.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	57,999	30,842	₦35.8bn	₦35.4bn	59%	1.9 yr
Commercial General	1,796	1,260	₦6.08bn	₦6.07bn	49%	2.1 yr
Commercial Retail	894	497	₦142m	₦142m	41%	2.6 yr
Worship	474	393	₦812m	₦812m	59%	1.9 yr
Anchor	413	363	₦4.57bn	₦4.47bn	69%	1.6 yr
Industrial	86	71	₦369m	₦369m	69%	1.6 yr
Filling Station	4	4	₦4.06m	₦4.06m	45%	1.6 yr
Hospitality	1	1	₦497k	₦497k	37%	2.9 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	22,261	12,186	₦20.3bn	₦20.2bn	63%	1.6 yr
50 100m2	15,337	8,195	₦3.82bn	₦3.62bn	57%	1.9 yr
Under 30m2	9,724	5,120	₦553m	₦521m	47%	2.1 yr
30 50m2	9,093	4,848	₦902m	₦875m	57%	1.9 yr
250 1000m2	5,155	3,012	₦19bn	₦18.8bn	67%	1.6 yr
Over 1000m2	97	70	₦3.22bn	₦3.22bn	63%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	45,277	25,092	₦34bn	₦33.8bn	59%	1.9 yr
Unclassified	6,767	3,293	₦6.62bn	₦6.39bn	25%	3.6 yr
Dense Urban	5,543	2,948	₦5.37bn	₦5.26bn	45%	2.4 yr
Rural	3,816	2,020	₦1.73bn	₦1.73bn	61%	1.6 yr
Urban Centre	264	78	₦55m	₦55m	25%	4.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	23,332	12,835	₦5.53bn	₦5.24bn	65%	1.6 yr
Residential	20,421	11,014	₦29.3bn	₦29.1bn	69%	1.6 yr
Shed	13,487	6,676	₦677m	₦677m	13%	6.9 yr
Commercial	1,200	821	₦4.11bn	₦4.11bn	47%	2.1 yr
Kiosk Shop	894	497	₦142m	₦142m	41%	2.6 yr
Residential Formal	651	252	₦308m	₦308m	25%	4.4 yr
Institutional	445	381	₦3.6bn	₦3.59bn	57%	1.9 yr
Commercial Corridor	234	143	₦475m	₦475m	45%	2.4 yr
Worship Center	173	139	₦203m	₦203m	63%	1.6 yr
Educational Facility	145	128	₦877m	₦877m	81%	1.4 yr
Place Of Worship	139	119	₦90.7m	₦90.7m	63%	1.6 yr
School	101	90	₦191m	₦191m	79%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	61,526	33,290	₦47.8bn	₦47.2bn
Retail	141	141	₦50.1m	₦50.1m

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	59,740	32,038	₦38.3bn	₦37.9bn	57%	1.9 yr
SME High	1,437	967	₦4.59bn	₦4.59bn	45%	2.4 yr
Enterprise	490	426	₦4.88bn	₦4.78bn	69%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	35,606	19,727	₦39.4bn	₦38.9bn
0.0	13,499	6,681	₦679m	₦679m
2.0	9,096	5,128	₦2.37bn	₦2.37bn
1.0	1,614	774	₦224m	₦224m
4.0	1,089	557	₦2.7bn	₦2.66bn
5.0	607	445	₦1.37bn	₦1.37bn
6.0	156	119	₦1.05bn	₦1.05bn