It's 'business as usual' at a gas compressor station of Bulgartransgaz in Ihtiman, a week after the halt of Russian gas supplies to Bulgaria, but industrial consumers -- big and small -- are on tenterhooks as they fear insecure deliveries and rising prices. Since its invasion of Ukraine soured its international relations, Moscow insists Gazprom customers must pay in rubles rather than US dollars or euros, leading the Russian energy giant to cut deliveries to Bulgaria and Poland on April 27. IMAGES AND SOUNDBITES