As regards the contracts between OSE and HSY, the following six programme agreements (PA) were concluded at the end of 1997: PA 33 SD 33, PA 33 SD 33a, PA 35 SD 35, PA 37 SD 37a, PA 39 SD 39 and PA 41 SD 41a.
OSE ja HSY vahel sõlmiti 1997. aasta lõpul järgnevad kuus programmilepingut (edaspidi PA): PA 33 SD 33, PA 33 SD 33a, PA 35 SD 35, PA 37 SD 37a, PA 39 SD 39 ja PA 41 SD 41a.