Green Points — Non-Monetary Plastic Buyback System
A point-based compensation model to mobilise 119 tonnes of plastic waste recovery across São Tomé & Príncipe
Green Points
IslandPlas STP · Non-Monetary Plastic Buyback System
Every kilogram counts
119 t
Collection target
~1.14M
Points to issue
$8,750
Rewards budget
$0.074
Cost per kg collected
Register new collector
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Points by plastic type
| Plastic type | Common examples | Points / kg | Relative value |
|---|---|---|---|
| PET | Water bottles, soft drink bottles | Highest | |
| HDPE | Jerry cans, rigid containers | High | |
| LDPE | Bags, film wrap, flexible packaging | Medium | |
| PP | Bottle caps, yoghurt cups, straws | Medium | |
| PS | Foam cups, takeaway containers | Low | |
| PVC | Pipes, vinyl flooring, blister packs | Lowest | |
| Mixed | Unclassified plastic waste | Base rate |
Cleanliness bonus
Washed and dry plastic → +2 pts/kg on entire delivery
School programme bonus
Plastic collected via school drives → ×1.5 pts multiplier
Volume bonus
Single drop-off of ≥ 10 kg → +50 fixed bonus points
Family account
Up to 6 household members pool points on one card
Points calculator
Assign to a collector (optional)
20 kg
10 kg
5 kg
0 kg
0 kg
0 kg
5 kg
280 pts
earned from this drop-off
Rewards unlocked at this balance
Points distribution across 119 tonnes
PET 60% 71.4 t × 10714,000 pts
HDPE 25% 29.75 t × 8238,000 pts
LDPE 15% 17.85 t × 6107,100 pts
Estimated bonuses (~8%)+84,650 pts
Total points issued~1,143,750 pts
Rewards budget by source
GreenAd — compensation fund$5,000
Bom Successo EPR (in-kind goods)$2,000
HBD Príncipe (co-funding)$1,000
Local sponsorships / donations$750
Total available$8,750
Operational rules
Green Points Card (physical + QR code)Every registered collector receives a laminated, numbered card with a QR code.
Drop-off limit: 20 kg per visitPrevents arbitrage by middlemen and bulk resellers.
Points never expire during the projectValid until 6 months after project closure (July 2028).
Family account (up to 6 members)One household registers under a single primary card.