diff --git a/src/Common/Controllers/ResponseFactory.php b/src/Common/Controllers/ResponseFactory.php
index c995cea1..9cccee6a 100644
--- a/src/Common/Controllers/ResponseFactory.php
+++ b/src/Common/Controllers/ResponseFactory.php
@@ -3,6 +3,7 @@
 namespace VSV\GVQ_API\Common\Controllers;
 
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\StreamedResponse;
 
 class ResponseFactory
 {
@@ -31,6 +32,31 @@ public function createCsvResponse(string $data, string $model): Response
         return $response;
     }
 
+    /**
+     * @param \Closure $callBack
+     * @param string $model
+     * @return StreamedResponse
+     */
+    public function createStreamedCsvResponse(\Closure $callBack, string $model): StreamedResponse
+    {
+        $response = new StreamedResponse();
+
+        $response->headers->set('Content-Encoding', 'UTF-8');
+        $response->headers->set('Content-Type', 'application/csv; charset=UTF-8');
+        $response->headers->set('Content-Transfer-Encoding', 'binary');
+
+        $now = new \DateTime();
+        $fileName = $model.'_'.$now->format(\DateTime::ATOM).'.csv';
+        $response->headers->set(
+            'Content-Disposition',
+            'attachment; filename="'.$fileName.'"'
+        );
+
+        $response->setCallback($callBack);
+
+        return $response;
+    }
+
     /**
      * @param string $data
      * @return string
diff --git a/src/Contest/Controllers/ContestViewController.php b/src/Contest/Controllers/ContestViewController.php
index 648231fd..3ba61f27 100644
--- a/src/Contest/Controllers/ContestViewController.php
+++ b/src/Contest/Controllers/ContestViewController.php
@@ -9,11 +9,13 @@
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\StreamedResponse;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Symfony\Component\Serializer\SerializerInterface;
 use Symfony\Component\Translation\TranslatorInterface;
 use VSV\GVQ_API\Common\Controllers\ResponseFactory;
 use VSV\GVQ_API\Contest\Forms\ContestFormType;
+use VSV\GVQ_API\Contest\Models\ContestParticipation;
 use VSV\GVQ_API\Contest\Models\TieBreaker;
 use VSV\GVQ_API\Contest\Repositories\TieBreakerRepository;
 use VSV\GVQ_API\Contest\Service\ContestService;
@@ -166,24 +168,68 @@ public function contest(Request $request, string $quizId): Response
     }
 
     /**
-     * @return Response
+     * @return StreamedResponse
      */
     public function export(): Response
     {
-        $contestParticipations = $this->contestService->getAll();
-        $contestParticipationsAsCsv = $this->serializer->serialize(
-            $contestParticipations,
-            'csv'
-        );
+        $traversableContestParticipations = $this->contestService->getTraversableContestParticipations();
 
-        $response = $this->responseFactory->createCsvResponse(
-            $contestParticipationsAsCsv,
-            'contest_participations'
-        );
+        $callback = $this->createCallBackForStreamedCsvResponse($traversableContestParticipations);
+        $response = $this->responseFactory->createStreamedCsvResponse($callback, 'contest_participations');
 
         return $response;
     }
 
+    /**
+     * @param \Traversable $traversableContestParticipations
+     * @return \Closure
+     */
+    private function createCallBackForStreamedCsvResponse(\Traversable $traversableContestParticipations): \Closure
+    {
+        return function () use ($traversableContestParticipations) {
+            $handle = fopen('php://output', 'r+');
+            fwrite(
+                $handle,
+                chr(0xFF).chr(0xFE).$this->convertEncoding('sep=,'.PHP_EOL)
+            );
+
+            $headerSet = false;
+            foreach ($traversableContestParticipations as $contestParticipation) {
+                /** @var ContestParticipation $contestParticipation */
+
+                $contestParticipationAsCsv = $this->serializer->serialize(
+                    $contestParticipation,
+                    'csv'
+                );
+                $headerValuesArray = explode("\n", $contestParticipationAsCsv);
+
+                if (!$headerSet) {
+                    $header = $headerValuesArray[0];
+                    fwrite(
+                        $handle,
+                        $this->convertEncoding($header.PHP_EOL)
+                    );
+                    $headerSet = true;
+                }
+
+                fwrite(
+                    $handle,
+                    $this->convertEncoding($headerValuesArray[1].PHP_EOL)
+                );
+            }
+            fclose($handle);
+        };
+    }
+
+    /**
+     * @param string $string
+     * @return string
+     */
+    private function convertEncoding(string $string): string
+    {
+        return mb_convert_encoding($string, 'UTF-16LE', 'UTF-8');
+    }
+
     /**
      * @return FormInterface
      */
@@ -194,7 +240,7 @@ private function createContestForm(): FormInterface
         $this->contestFormType->buildForm(
             $formBuilder,
             [
-                'translator' => $this->translator
+                'translator' => $this->translator,
             ]
         );
 
diff --git a/src/Contest/Repositories/ContestParticipationDoctrineRepository.php b/src/Contest/Repositories/ContestParticipationDoctrineRepository.php
index 3f16ff89..ccefd026 100644
--- a/src/Contest/Repositories/ContestParticipationDoctrineRepository.php
+++ b/src/Contest/Repositories/ContestParticipationDoctrineRepository.php
@@ -64,6 +64,38 @@ public function getAll(): ?ContestParticipations
         return $this->toContestParticipations($contestParticipationEntities);
     }
 
+    /**
+     * @return \Traversable
+     */
+    public function getAllAsTraversable(): \Traversable
+    {
+        $batchSize = 10;
+        $firstResult = 0;
+
+        do {
+            $queryBuilder = $this->entityManager->createQueryBuilder();
+
+            $query = $queryBuilder->select('e')
+                ->from(
+                    'VSV\GVQ_API\Contest\Repositories\Entities\ContestParticipationEntity',
+                    'e'
+                )
+                ->orderBy('e.id', 'ASC')
+                ->setMaxResults($batchSize)
+                ->setFirstResult($firstResult)
+                ->getQuery();
+
+            $currentBatchItemCount = 0;
+
+            foreach ($query->iterate() as $contestParticipationEntities) {
+                $currentBatchItemCount++;
+                yield $contestParticipationEntities[0]->toContestParticipation();
+            }
+
+            $firstResult += $batchSize;
+        } while ($currentBatchItemCount == $batchSize);
+    }
+
     /**
      * @param Year $year
      * @param Email $email
diff --git a/src/Contest/Repositories/ContestParticipationRepository.php b/src/Contest/Repositories/ContestParticipationRepository.php
index 73f4f9b2..d86de5e0 100644
--- a/src/Contest/Repositories/ContestParticipationRepository.php
+++ b/src/Contest/Repositories/ContestParticipationRepository.php
@@ -32,6 +32,11 @@ public function getByYearAndEmailAndChannel(
      */
     public function getAll(): ?ContestParticipations;
 
+    /**
+     * @return \Traversable
+     */
+    public function getAllAsTraversable(): \Traversable;
+
     /**
      * @param Year $year
      * @param Email $email
diff --git a/src/Contest/Service/ContestService.php b/src/Contest/Service/ContestService.php
index 046cb990..4db3602c 100644
--- a/src/Contest/Service/ContestService.php
+++ b/src/Contest/Service/ContestService.php
@@ -51,6 +51,14 @@ public function getAll(): ?ContestParticipations
         return $this->contestParticipationRepository->getAll();
     }
 
+    /**
+     * @return \Traversable
+     */
+    public function getTraversableContestParticipations(): \Traversable
+    {
+        return $this->contestParticipationRepository->getAllAsTraversable();
+    }
+
     /**
      * Can only participate if 11 or more and no previous participation for given channel.
      *