Anambra State

Rooftop solar in Idemili North, Anambra: what the roofs are worth

Idemili North has 112,222 buildings with a viable rooftop and 2.8 GWp of roof capacity. 55% run a generator, and together they spend ₦151bn a year on energy.

Viable buildings

112,222

Usable roof area

12.5 km²

2.8 GWp roof capacity

Energy spend

₦151bn/yr

129 GWh/yr burned on generators

Median payback

3.1 yr

Median IRR 33% (cash saved)

The savings bracket for Idemili North

Approach B

Cash saved

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

Current energy spend₦151bn/yr

Year-one cash saved₦147bn

Lifetime cash saved₦7.64tn

NPV₦1.15tn

Median IRR33%

Median payback3.1 yr

Unlocked energy95.7 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity407 MWp

Capex₦409bn

Year-one energy value₦306bn

Lifetime energy value₦14.4tn

NPV₦2.36tn

Median IRR81%

Median payback1.4 yr

Three ways to size Idemili North'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: 407 MWp
Capital cost: ₦409bn
Year 1 savings: ₦306bn/yr
NPV: ₦2.36tn
Median IRR: 81%
Median payback: 1.4 yr

The odds a rooftop in Idemili North pays back quickly

Of the 111,942 buildings in Idemili North with a modelled payback, 83.6% pay back inside five years and 47.5% inside three.

Create a free account

How much of Idemili North's demand actually gets met

Buildings in Idemili North consume 242 GWh/yr but want 337 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 Idemili North

Loading band economics…

How many rooftops in Idemili North 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 111,942 buildings with a modelled result out of 112,222 in Idemili North. 103,050 clear a positive NPV.

Payback

Under 3 years53,183 (48%)

Under 5 years93,621 (84%)

Under 7 years102,997 (92%)

Under 10 years107,663 (96%)

Return (IRR)

Above 10%106,764 (95%)

Above 15%103,050 (92%)

Above 20%96,725 (86%)

Above 25%82,284 (73%)

CO₂ avoided

264 kt/yr

Fuel avoided

74.7 million litres/yr

Energy unlocked

95.7 GWh/yr

Demand that is suppressed today

People served

590k

What hardware costs right now

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

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 Idemili North

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
A	58,931	34,082	₦73.9bn	₦72.5bn	33%	3.4 yr
C	16,845	8,233	₦22.1bn	₦21.9bn	25%	4.1 yr
B	16,350	11,043	₦28.7bn	₦28bn	55%	1.9 yr
E	10,752	4,162	₦10.6bn	₦10.6bn	25%	4.4 yr
D	9,344	4,662	₦15.5bn	₦14.2bn	27%	3.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	107,412	58,354	₦116bn	₦114bn	31%	3.4 yr
Commercial General	2,561	2,117	₦17.5bn	₦17.4bn	47%	2.4 yr
Commercial Retail	1,005	905	₦359m	₦359m	47%	2.4 yr
Anchor	589	371	₦13.5bn	₦12.5bn	45%	2.4 yr
Worship	304	178	₦624m	₦522m	41%	2.6 yr
Industrial	280	218	₦2.09bn	₦2.07bn	55%	1.9 yr
Filling Station	31	20	₦62.2m	₦62.2m	41%	2.6 yr
Hospitality	30	15	₦428m	₦394m	35%	2.9 yr
Mall Retail	5	1	₦1.57m	₦1.57m	33%	3.1 yr
Automotive	3	2	₦3.23m	₦3.23m	41%	2.6 yr
Productive Use	2	1	₦6.58m	₦6.58m	35%	2.1 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	38,921	21,220	₦54bn	₦52.8bn	33%	3.1 yr
50 100m2	24,267	13,519	₦9.06bn	₦8.87bn	35%	3.1 yr
Under 30m2	19,226	10,479	₦1.23bn	₦1.23bn	27%	3.9 yr
250 1000m2	15,192	8,884	₦66.2bn	₦65.2bn	37%	2.9 yr
30 50m2	14,329	7,875	₦2.09bn	₦2.03bn	33%	3.4 yr
Over 1000m2	287	205	₦18.3bn	₦17.1bn	49%	2.1 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	108,310	59,814	₦144bn	₦140bn	33%	3.1 yr
Unclassified	3,912	2,368	₦7.11bn	₦6.75bn	41%	2.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential Formal	30,326	15,036	₦12.4bn	₦12.4bn	25%	4.1 yr
Residential Small	21,213	12,280	₦11.5bn	₦11.2bn	57%	1.9 yr
Residential	20,530	12,213	₦80.4bn	₦78.4bn	59%	1.9 yr
Residential Informal	16,135	8,552	₦8.78bn	₦8.77bn	29%	3.9 yr
Shed	13,458	7,556	₦919m	₦919m	45%	2.4 yr
Apartment	3,824	1,781	₦1.47bn	₦1.47bn	25%	4.1 yr
Duplex	1,825	868	₦711m	₦711m	25%	4.1 yr
Commercial	1,210	1,060	₦10.2bn	₦10.1bn	47%	2.1 yr
Kiosk Shop	1,007	906	₦366m	₦366m	47%	2.4 yr
Commercial Corridor	633	571	₦4.15bn	₦4.14bn	47%	2.4 yr
Institutional	579	402	₦12bn	₦11.3bn	43%	2.6 yr
Unknown	215	143	₦899m	₦899m	39%	2.9 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	111,659	61,804	₦150bn	₦147bn
Industrial	563	378	₦589m	₦589m

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	109,506	59,965	₦121bn	₦119bn	33%	3.4 yr
SME High	1,897	1,662	₦14.4bn	₦14.4bn	47%	2.4 yr
Enterprise	819	555	₦15.4bn	₦14.3bn	49%	2.1 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
4.0	43,053	21,476	₦32.4bn	₦32.2bn
3.0	40,979	24,089	₦101bn	₦97.7bn
0.0	13,403	7,547	₦936m	₦936m
2.0	12,034	7,073	₦4.52bn	₦4.38bn
1.0	1,457	866	₦163m	₦163m
5.0	950	829	₦4.36bn	₦4.35bn
6.0	346	302	₦7.6bn	₦7.51bn