Benue State

Rooftop solar in Gwer West, Benue: what the roofs are worth

Gwer West has 54,946 buildings with a viable rooftop and 348 MWp of roof capacity. 15% run a generator, and together they spend ₦7.91bn a year on energy.

Viable buildings

54,946

Usable roof area

1.59 km²

348 MWp roof capacity

Energy spend

₦7.91bn/yr

6.96 GWh/yr burned on generators

Median payback

15.1 yr

Median IRR 7% (cash saved)

The savings bracket for Gwer West

Approach B

Cash saved

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

Current energy spend₦7.91bn/yr

Year-one cash saved₦7.81bn

Lifetime cash saved₦408bn

NPV₦62.6bn

Median IRR7%

Median payback15.1 yr

Unlocked energy7.39 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity47.1 MWp

Capex₦50.3bn

Year-one energy value₦49.7bn

Lifetime energy value₦2.35tn

NPV₦402bn

Median IRR97%

Median payback1.1 yr

Three ways to size Gwer West'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: 47.1 MWp
Capital cost: ₦50.3bn
Year 1 savings: ₦49.7bn/yr
NPV: ₦402bn
Median IRR: 97%
Median payback: 1.1 yr

The odds a rooftop in Gwer West pays back quickly

Of the 54,566 buildings in Gwer West with a modelled payback, 28.9% pay back inside five years and 14.9% inside three.

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How much of Gwer West's demand actually gets met

Buildings in Gwer West consume 11.7 GWh/yr but want 19.1 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 Gwer West

Loading band economics…

How many rooftops in Gwer West 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 54,566 buildings with a modelled result out of 54,946 in Gwer West. 18,328 clear a positive NPV.

Payback

Under 3 years8,148 (15%)

Under 5 years15,762 (29%)

Under 7 years18,316 (34%)

Under 10 years20,220 (37%)

Return (IRR)

Above 10%19,482 (35%)

Above 15%18,328 (33%)

Above 20%16,556 (30%)

Above 25%14,072 (26%)

CO₂ avoided

14.9 kt/yr

Fuel avoided

4.1 million litres/yr

Energy unlocked

7.39 GWh/yr

Demand that is suppressed today

People served

164k

What hardware costs right now

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

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 Gwer West

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	22,843	3,325	₦3.47bn	₦3.42bn	7%	14.9 yr
E	17,319	1,895	₦2.31bn	₦2.29bn	7%	15.4 yr
C	14,784	2,974	₦2.13bn	₦2.1bn	7%	14.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	54,361	7,653	₦6.53bn	₦6.42bn	7%	15.1 yr
Worship	215	193	₦98.8m	₦98.8m	57%	1.9 yr
Anchor	213	199	₦802m	₦796m	77%	1.4 yr
Commercial General	143	135	₦479m	₦479m	59%	1.9 yr
Industrial	7	7	₦6.82m	₦6.82m	73%	1.4 yr
Commercial Retail	6	6	₦577k	₦577k	55%	1.9 yr
Hospitality	1	1	₦252k	₦252k	51%	2.1 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	36,996	4,878	₦392m	₦392m	5%	16.4 yr
30 50m2	6,713	1,144	₦378m	₦378m	9%	12.9 yr
50 100m2	6,669	1,089	₦1.66bn	₦1.64bn	27%	4.1 yr
100 250m2	4,011	775	₦2.15bn	₦2.09bn	27%	4.1 yr
250 1000m2	538	298	₦3.05bn	₦3.02bn	53%	1.9 yr
Over 1000m2	19	10	₦286m	₦286m	59%	1.9 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Unclassified	30,254	5,150	₦5.11bn	₦5.01bn	7%	15.6 yr
Dense Urban	14,961	1,246	₦1.29bn	₦1.29bn	9%	9.6 yr
Urban	6,486	870	₦1.09bn	₦1.08bn	7%	14.4 yr
Rural	3,245	928	₦428m	₦428m	7%	14.6 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	39,209	4,582	₦325m	₦325m	5%	16.1 yr
Residential Small	8,024	1,164	₦1.87bn	₦1.83bn	27%	4.1 yr
Residential	5,935	1,329	₦4.17bn	₦4.1bn	27%	4.1 yr
Residential Informal	1,193	578	₦164m	₦164m	27%	4.1 yr
Institutional	183	166	₦507m	₦507m	57%	1.9 yr
Educational Facility	97	94	₦329m	₦329m	85%	1.1 yr
Worship Center	94	87	₦35.7m	₦35.7m	61%	1.6 yr
Place Of Worship	56	50	₦4.57m	₦4.57m	57%	1.9 yr
School	49	47	₦71.1m	₦71.1m	81%	1.4 yr
Healthcare Facility	38	33	₦219m	₦219m	53%	2.1 yr
Clinic	23	19	₦20.5m	₦20.5m	49%	2.1 yr
Commercial Corridor	11	11	₦71.9m	₦71.9m	53%	2.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	54,946	8,194	₦7.91bn	₦7.81bn

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	54,705	7,967	₦7.01bn	₦6.9bn	7%	15.1 yr
Enterprise	220	206	₦808m	₦803m	77%	1.4 yr
SME High	21	21	₦100m	₦100m	59%	1.9 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	39,245	4,616	₦327m	₦327m
1.0	7,073	1,804	₦1.56bn	₦1.54bn
2.0	6,854	1,369	₦2.75bn	₦2.7bn
3.0	1,285	385	₦3.14bn	₦3.1bn
4.0	483	14	₦70.3m	₦70.3m
5.0	6	6	₦66.9m	₦66.9m