Ebonyi State

Rooftop solar in Izzi, Ebonyi: what the roofs are worth

Izzi has 122,304 buildings with a viable rooftop and 1.57 GWp of roof capacity. 6% run a generator, and together they spend ₦11.2bn a year on energy.

Viable buildings

122,304

Usable roof area

7.05 km²

1.57 GWp roof capacity

Energy spend

₦11.2bn/yr

12 GWh/yr burned on generators

Median payback

6.1 yr

Median IRR 17% (cash saved)

The savings bracket for Izzi

Approach B

Cash saved

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

Current energy spend₦11.2bn/yr

Year-one cash saved₦11.2bn

Lifetime cash saved₦612bn

NPV₦88.8bn

Median IRR17%

Median payback6.1 yr

Unlocked energy14.5 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity115 MWp

Capex₦117bn

Year-one energy value₦106bn

Lifetime energy value₦5.07tn

NPV₦855bn

Median IRR101%

Median payback1.1 yr

Three ways to size Izzi'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: 115 MWp
Capital cost: ₦117bn
Year 1 savings: ₦106bn/yr
NPV: ₦855bn
Median IRR: 101%
Median payback: 1.1 yr

The odds a rooftop in Izzi pays back quickly

Of the 121,403 buildings in Izzi with a modelled payback, 33.4% pay back inside five years and 6.4% inside three.

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How much of Izzi's demand actually gets met

Buildings in Izzi consume 21.8 GWh/yr but want 36.3 GWh/yr. The 40% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Izzi

Loading band economics…

How many rooftops in Izzi 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 121,403 buildings with a modelled result out of 122,304 in Izzi. 68,166 clear a positive NPV.

Payback

Under 3 years7,803 (6%)

Under 5 years40,558 (33%)

Under 7 years68,012 (56%)

Under 10 years80,495 (66%)

Return (IRR)

Above 10%78,498 (64%)

Above 15%68,166 (56%)

Above 20%49,206 (40%)

Above 25%25,857 (21%)

CO₂ avoided

21.9 kt/yr

Fuel avoided

4.5 million litres/yr

Energy unlocked

14.5 GWh/yr

Demand that is suppressed today

People served

382k

What hardware costs right now

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

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 Izzi

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	54,531	3,053	₦4.14bn	₦4.14bn	17%	6.1 yr
E	52,793	3,724	₦5.47bn	₦5.46bn	17%	6.4 yr
C	14,943	999	₦1.59bn	₦1.59bn	17%	5.9 yr
B	37	1	₦1.43m	₦1.43m	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	118,006	4,595	₦4.18bn	₦4.18bn	17%	6.4 yr
Commercial General	1,927	1,408	₦2.98bn	₦2.98bn	55%	1.9 yr
Anchor	746	631	₦2.55bn	₦2.54bn	73%	1.4 yr
Worship	623	472	₦702m	₦702m	57%	1.9 yr
Industrial	608	449	₦712m	₦712m	65%	1.6 yr
Commercial Retail	356	190	₦40m	₦40m	55%	1.9 yr
Filling Station	36	30	₦36m	₦36m	61%	1.6 yr
Mall Retail	2	2	₦2.28m	₦2.28m	45%	2.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
50 100m2	50,081	2,467	₦1.71bn	₦1.71bn	21%	5.4 yr
Under 30m2	25,403	1,125	₦175m	₦175m	5%	16.6 yr
30 50m2	23,232	1,039	₦308m	₦308m	9%	13.6 yr
100 250m2	21,303	2,329	₦3.55bn	₦3.55bn	25%	4.4 yr
250 1000m2	2,254	797	₦4.23bn	₦4.22bn	25%	4.1 yr
Over 1000m2	31	20	₦1.24bn	₦1.24bn	63%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	105,311	7,012	₦10.3bn	₦10.3bn	17%	6.1 yr
Unclassified	14,509	383	₦560m	₦560m	11%	8.9 yr
Dense Urban	1,835	291	₦203m	₦203m	17%	5.6 yr
Urban Centre	649	91	₦95.6m	₦95.6m	19%	5.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Small	58,087	2,267	₦1.25bn	₦1.25bn	19%	5.4 yr
Shed	39,226	860	₦155m	₦155m	7%	15.6 yr
Residential	19,807	1,390	₦2.75bn	₦2.75bn	25%	4.4 yr
Institutional	1,181	930	₦2.49bn	₦2.49bn	53%	1.9 yr
Residential Formal	758	68	₦21.7m	₦21.7m	19%	5.6 yr
Commercial	635	441	₦1.63bn	₦1.63bn	61%	1.6 yr
Industrial Site	593	440	₦642m	₦642m	65%	1.6 yr
Educational Facility	357	296	₦638m	₦638m	79%	1.4 yr
Kiosk Shop	356	190	₦40m	₦40m	55%	1.9 yr
Worship Center	246	181	₦79.9m	₦79.9m	59%	1.9 yr
Market	215	193	₦125m	₦125m	61%	1.6 yr
School	175	147	₦231m	₦231m	77%	1.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	122,283	7,761	₦11.2bn	₦11.2bn
Industrial	18	16	₦25.3m	₦25.3m
Farmland	2	0	₦80.8k	₦80.8k
Farmyard	1	0	₦8.56k	₦8.56k

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	120,180	6,209	₦6.25bn	₦6.25bn	17%	6.4 yr
Enterprise	1,344	1,076	₦3.26bn	₦3.25bn	67%	1.6 yr
SME High	780	492	₦1.7bn	₦1.7bn	61%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
2.0	43,644	3,054	₦2.38bn	₦2.38bn
0.0	39,183	821	₦151m	₦151m
1.0	30,152	1,342	₦680m	₦680m
3.0	8,550	2,369	₦6.82bn	₦6.81bn
4.0	772	188	₦1.1bn	₦1.1bn
5.0	3	3	₦66.4m	₦66.4m