Plateau State

Rooftop solar in Langtang South, Plateau: what the roofs are worth

Langtang South has 87,007 buildings with a viable rooftop and 361 MWp of roof capacity. 5% run a generator, and together they spend ₦4.82bn a year on energy.

Viable buildings

87,007

Usable roof area

1.65 km²

361 MWp roof capacity

Energy spend

₦4.82bn/yr

4.44 GWh/yr burned on generators

Median payback

17.4 yr

Median IRR 5% (cash saved)

The savings bracket for Langtang South

Approach B

Cash saved

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

Current energy spend₦4.82bn/yr

Year-one cash saved₦4.82bn

Lifetime cash saved₦258bn

NPV₦37.1bn

Median IRR5%

Median payback17.4 yr

Unlocked energy5.14 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity35.9 MWp

Capex₦39.4bn

Year-one energy value₦39.1bn

Lifetime energy value₦1.86tn

NPV₦318bn

Median IRR95%

Median payback1.1 yr

Three ways to size Langtang South'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: 35.9 MWp
Capital cost: ₦39.4bn
Year 1 savings: ₦39.1bn/yr
NPV: ₦318bn
Median IRR: 95%
Median payback: 1.1 yr

The odds a rooftop in Langtang South pays back quickly

Of the 85,936 buildings in Langtang South with a modelled payback, 14.7% pay back inside five years and 4.7% inside three.

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How much of Langtang South's demand actually gets met

Buildings in Langtang South consume 8.07 GWh/yr but want 13.2 GWh/yr. The 39% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Langtang South

Loading band economics…

How many rooftops in Langtang South 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 85,936 buildings with a modelled result out of 87,007 in Langtang South. 15,664 clear a positive NPV.

Payback

Under 3 years4,052 (5%)

Under 5 years12,673 (15%)

Under 7 years15,670 (18%)

Under 10 years19,093 (22%)

Return (IRR)

Above 10%17,891 (21%)

Above 15%15,664 (18%)

Above 20%13,546 (16%)

Above 25%10,703 (12%)

CO₂ avoided

9.34 kt/yr

Fuel avoided

2.32 million litres/yr

Energy unlocked

5.14 GWh/yr

Demand that is suppressed today

People served

115k

What hardware costs right now

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

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 Langtang South

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	30,302	647	₦1.41bn	₦1.41bn	5%	17.6 yr
C	30,194	1,450	₦1.81bn	₦1.81bn	5%	17.4 yr
E	26,511	1,913	₦1.6bn	₦1.59bn	5%	16.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	86,215	3,424	₦3.36bn	₦3.36bn	5%	17.4 yr
Anchor	270	202	₦1.07bn	₦1.07bn	59%	1.6 yr
Commercial General	239	178	₦262m	₦262m	55%	1.9 yr
Worship	203	152	₦68.5m	₦68.5m	57%	1.9 yr
Industrial	78	52	₦49.1m	₦48.7m	65%	1.6 yr
Filling Station	2	2	₦3.66m	₦3.66m	47%	1.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	68,365	1,805	₦248m	₦248m	5%	18.1 yr
50 100m2	8,179	874	₦665m	₦664m	27%	4.1 yr
30 50m2	6,997	494	₦140m	₦137m	9%	9.9 yr
100 250m2	2,985	610	₦1.4bn	₦1.4bn	29%	3.9 yr
250 1000m2	471	218	₦1.75bn	₦1.75bn	29%	3.6 yr
Over 1000m2	10	9	₦613m	₦613m	63%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Rural	27,189	533	₦479m	₦476m	5%	17.6 yr
Urban	25,809	1,048	₦1.58bn	₦1.58bn	5%	17.1 yr
Unclassified	19,681	253	₦868m	₦868m	3%	19.1 yr
Dense Urban	14,328	2,176	₦1.9bn	₦1.9bn	9%	9.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	63,521	1,310	₦187m	₦187m	5%	18.1 yr
Residential Small	11,378	900	₦693m	₦689m	23%	4.4 yr
Residential	9,931	613	₦2.19bn	₦2.19bn	7%	13.6 yr
Residential Informal	1,360	600	₦290m	₦290m	29%	3.9 yr
Institutional	287	213	₦704m	₦704m	55%	1.9 yr
Educational Facility	95	73	₦161m	₦161m	83%	1.4 yr
Worship Center	76	57	₦19.3m	₦19.3m	61%	1.6 yr
Industrial Site	73	47	₦46.1m	₦45.7m	65%	1.6 yr
School	71	54	₦82.1m	₦82.1m	83%	1.4 yr
Place Of Worship	55	41	₦7.58m	₦7.58m	57%	1.9 yr
Healthcare Facility	51	34	₦384m	₦383m	51%	2.1 yr
Clinic	36	24	₦20.4m	₦20.4m	49%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	87,004	4,010	₦4.82bn	₦4.82bn
Industrial	3	0	₦347k	₦347k

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	86,657	3,754	₦3.69bn	₦3.69bn	5%	17.4 yr
Enterprise	348	254	₦1.12bn	₦1.12bn	65%	1.6 yr
SME High	2	2	₦3.66m	₦3.66m	47%	1.4 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	63,590	1,340	₦189m	₦189m
1.0	10,862	683	₦296m	₦293m
2.0	8,682	1,167	₦1.15bn	₦1.15bn
3.0	3,737	749	₦3bn	₦3bn
4.0	136	71	₦187m	₦187m