Imo State

Rooftop solar in Okigwe, Imo: what the roofs are worth

Okigwe has 45,382 buildings with a viable rooftop and 1.03 GWp of roof capacity. 51% run a generator, and together they spend ₦46.7bn a year on energy.

Viable buildings

45,382

Usable roof area

4.6 km²

1.03 GWp roof capacity

Energy spend

₦46.7bn/yr

45 GWh/yr burned on generators

Median payback

2.9 yr

Median IRR 37% (cash saved)

The savings bracket for Okigwe

Approach B

Cash saved

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

Current energy spend₦46.7bn/yr

Year-one cash saved₦46bn

Lifetime cash saved₦2.4tn

NPV₦378bn

Median IRR37%

Median payback2.9 yr

Unlocked energy40.4 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity175 MWp

Capex₦169bn

Year-one energy value₦146bn

Lifetime energy value₦6.89tn

NPV₦1.16tn

Median IRR99%

Median payback1.1 yr

Three ways to size Okigwe'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: 175 MWp
Capital cost: ₦169bn
Year 1 savings: ₦146bn/yr
NPV: ₦1.16tn
Median IRR: 99%
Median payback: 1.1 yr

The odds a rooftop in Okigwe pays back quickly

Of the 45,261 buildings in Okigwe with a modelled payback, 78.5% pay back inside five years and 50.4% inside three.

Create a free account

How much of Okigwe's demand actually gets met

Buildings in Okigwe consume 69.5 GWh/yr but want 110 GWh/yr. The 37% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

Create a free account

Electricity billing bands in Okigwe

Loading band economics…

How many rooftops in Okigwe 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 45,261 buildings with a modelled result out of 45,382 in Okigwe. 39,119 clear a positive NPV.

Payback

Under 3 years22,799 (50%)

Under 5 years35,518 (78%)

Under 7 years39,100 (86%)

Under 10 years41,402 (91%)

Return (IRR)

Above 10%40,824 (90%)

Above 15%39,119 (86%)

Above 20%36,708 (81%)

Above 25%28,143 (62%)

CO₂ avoided

84.2 kt/yr

Fuel avoided

23.5 million litres/yr

Energy unlocked

40.4 GWh/yr

Demand that is suppressed today

People served

297k

What hardware costs right now

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

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 Okigwe

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	20,242	9,831	₦22.5bn	₦22.3bn	33%	3.4 yr
E	19,193	10,033	₦17.9bn	₦17.6bn	43%	2.4 yr
C	5,947	3,091	₦6.25bn	₦6.14bn	39%	2.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	40,687	19,332	₦30.8bn	₦30.2bn	25%	4.4 yr
Commercial General	2,585	1,983	₦10.6bn	₦10.5bn	49%	2.1 yr
Commercial Retail	1,478	1,112	₦279m	₦279m	45%	2.4 yr
Anchor	375	317	₦4.33bn	₦4.3bn	65%	1.6 yr
Worship	153	133	₦142m	₦142m	61%	1.6 yr
Industrial	38	32	₦230m	₦230m	69%	1.6 yr
Hospitality	36	23	₦284m	₦273m	53%	1.9 yr
Productive Use	20	14	₦16.2m	₦16.2m	61%	1.6 yr
Filling Station	10	9	₦22.5m	₦22.5m	61%	1.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	16,509	8,358	₦17.2bn	₦16.9bn	43%	2.6 yr
50 100m2	10,576	5,183	₦2.96bn	₦2.93bn	33%	3.4 yr
Under 30m2	7,784	3,851	₦446m	₦445m	31%	3.4 yr
30 50m2	5,805	2,837	₦618m	₦618m	33%	3.4 yr
250 1000m2	4,636	2,666	₦20.8bn	₦20.4bn	51%	2.1 yr
Over 1000m2	72	60	₦4.71bn	₦4.69bn	71%	1.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	21,240	11,145	₦24bn	₦23.5bn	57%	1.9 yr
Dense Urban	20,303	10,459	₦16.5bn	₦16.5bn	37%	2.9 yr
Unclassified	3,315	1,043	₦3.9bn	₦3.85bn	25%	4.4 yr
Rural	319	179	₦257m	₦257m	67%	1.6 yr
Urban Centre	205	129	₦2.01bn	₦1.9bn	69%	1.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	14,885	7,318	₦3.88bn	₦3.85bn	25%	4.4 yr
Residential	13,972	6,909	₦25.7bn	₦25.2bn	25%	4.1 yr
Shed	7,595	3,330	₦334m	₦334m	11%	9.4 yr
Residential Formal	3,678	1,502	₦760m	₦760m	25%	4.4 yr
Kiosk Shop	1,497	1,125	₦295m	₦295m	45%	2.4 yr
Commercial	1,292	1,102	₦6.16bn	₦6.11bn	49%	2.1 yr
Commercial Corridor	1,021	659	₦3.54bn	₦3.47bn	47%	2.4 yr
Apartment	398	197	₦79.7m	₦79.7m	25%	4.4 yr
Institutional	247	216	₦2.58bn	₦2.58bn	57%	1.9 yr
Duplex	158	75	₦37m	₦37m	25%	4.4 yr
Educational Facility	119	104	₦584m	₦584m	83%	1.4 yr
School	102	89	₦294m	₦294m	79%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	45,382	22,955	₦46.7bn	₦46bn

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	42,647	20,837	₦32.4bn	₦31.9bn	25%	4.1 yr
SME High	2,334	1,777	₦9.73bn	₦9.6bn	47%	2.1 yr
Enterprise	401	341	₦4.53bn	₦4.5bn	67%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
3.0	22,995	12,121	₦32.8bn	₦32.2bn
0.0	7,587	3,326	₦333m	₦333m
4.0	6,398	2,709	₦4.35bn	₦4.28bn
2.0	5,925	3,086	₦1.55bn	₦1.55bn
5.0	1,407	1,033	₦3.32bn	₦3.23bn
1.0	738	396	₦134m	₦134m
6.0	332	284	₦4.26bn	₦4.26bn