3.1.1.2 Revenue from contracts with customers under IFRS 15 by type of customer
| 2021 | Exploration and Production |
Trade and Storage | Distribution | Generation | Other segments |
Reconciliation with consolidated data |
Total |
| Retail customers | – | 5,175 | 149 | 3 | 14 | 2,452 | 7,793 |
| Business and institutional customers |
15,889 | 29,740 | 5,244 | 3,329 | 528 | (17,706) | 37,024 |
| Exchange | – | 25,728 | – | 91 | – | – | 25,819 |
| Total revenue from contracts with customers under IFRS 15 | 15,889 | 60,643 | 5,393 | 3,423 | 542 | (15,254) | 70,636 |
| 2020 | Exploration and Production |
Trade and Storage | Distribution | Generation | Other segments |
Reconciliation with consolidated data |
Total |
| Retail customers | – | 4,544 | 125 | 2 | 12 | 2,061 | 6,744 |
| Business and institutional customers | 4,611 | 13,248 | 4,539 | 2,707 | 458 | (6,047) | 19,516 |
| Exchange | – | 11,787 | – | 64 | – | – | 11,851 |
| Total revenue from contracts with customers under IFRS 15 | 4,611 | 29,579 | 4,664 | 2,773 | 470 | (3,986) | 38,111 |
Revenue from sales to retail customers in 2021 and 2020 was mainly generated by the Trade and Storage segment, the most important part of which were gas sales.
Revenue from sales to business and institutional customers represented the vast majority of revenue generated by the Distribution and Generation segments (both 2021 and 2020). In the Trade and Storage segment and the Exploration and Production segment, sales to business and institutional customers were primarily gas sales (both in 2021 and 2020).
Revenue from the energy exchange was generated mainly in the Trade and Storage segment and comprised revenue from sale of gas and electricity.