diff --git a/src/repositories/powerBoostingRepository.test.ts b/src/repositories/powerBoostingRepository.test.ts
index 0689a4c73..04c80b5a6 100644
--- a/src/repositories/powerBoostingRepository.test.ts
+++ b/src/repositories/powerBoostingRepository.test.ts
@@ -1,16 +1,19 @@
 import {
+  assertThrowsAsync,
   createProjectData,
   generateRandomEtheriumAddress,
   saveProjectDirectlyToDb,
   saveUserDirectlyToDb,
 } from '../../test/testUtils';
 import {
+  cancelProjectBoosting,
   findPowerBoostings,
   findUserPowerBoosting,
   findUsersWhoBoostedProject,
   getPowerBoostingSnapshotRound,
   insertSinglePowerBoosting,
   setMultipleBoosting,
+  setSingleBoosting,
   takePowerBoostingSnapshot,
 } from './powerBoostingRepository';
 import { assert, use } from 'chai';
@@ -20,10 +23,12 @@ import { PowerBoostingSnapshot } from '../entities/powerBoostingSnapshot';
 import { getConnection } from 'typeorm';
 import { Reaction } from '../entities/reaction';
 import { findUsersWhoLikedProject } from './reactionRepository';
+import { errorMessages } from '../utils/errorMessages';
 
 describe('findUserPowerBoosting() testCases', findUserPowerBoostingTestCases);
 describe('findPowerBoostings() testCases', findPowerBoostingsTestCases);
 describe('setMultipleBoosting() testCases', setMultipleBoostingTestCases);
+describe('setSingleBoosting() testCases', setSingleBoostingTestCases);
 describe('power boosting snapshot testCases', powerBoostingSnapshotTests);
 describe(
   'findUsersWhoBoostedProject() testCases',
@@ -726,6 +731,134 @@ function setMultipleBoostingTestCases() {
   });
 }
 
+function setSingleBoostingTestCases() {
+  it('should set single boosting with 100%, when boosted multi project', async () => {
+    const user = await saveUserDirectlyToDb(generateRandomEtheriumAddress());
+    const firstProject = await saveProjectDirectlyToDb(createProjectData());
+    const secondProject = await saveProjectDirectlyToDb(createProjectData());
+    const thirdProject = await saveProjectDirectlyToDb(createProjectData());
+    await setMultipleBoosting({
+      userId: user.id,
+      projectIds: [firstProject.id, secondProject.id, thirdProject.id],
+      percentages: [40, 20, 40],
+    });
+    await setSingleBoosting({
+      userId: user.id,
+      projectId: firstProject.id,
+      percentage: 100,
+    });
+    const [userPowerBoostings] = await findPowerBoostings({
+      userId: user.id,
+      orderBy: {
+        field: 'updatedAt',
+        direction: 'ASC',
+      },
+    });
+    assert.equal(userPowerBoostings.length, 1);
+    assert.equal(userPowerBoostings[0].percentage, 100);
+    assert.equal(userPowerBoostings[0].projectId, firstProject.id);
+  });
+  it('should set single boosting with 100%', async () => {
+    const user = await saveUserDirectlyToDb(generateRandomEtheriumAddress());
+    const firstProject = await saveProjectDirectlyToDb(createProjectData());
+
+    await setSingleBoosting({
+      userId: user.id,
+      projectId: firstProject.id,
+      percentage: 100,
+    });
+
+    const [userPowerBoostings] = await findPowerBoostings({
+      userId: user.id,
+      orderBy: {
+        field: 'updatedAt',
+        direction: 'ASC',
+      },
+    });
+
+    assert.equal(userPowerBoostings.length, 1);
+    assert.equal(userPowerBoostings[0].percentage, 100);
+    assert.equal(userPowerBoostings[0].projectId, firstProject.id);
+  });
+
+  it('should set single boosting with 0%, when boosted multi project', async () => {
+    const user = await saveUserDirectlyToDb(generateRandomEtheriumAddress());
+    const firstProject = await saveProjectDirectlyToDb(createProjectData());
+    const secondProject = await saveProjectDirectlyToDb(createProjectData());
+    const thirdProject = await saveProjectDirectlyToDb(createProjectData());
+    await setMultipleBoosting({
+      userId: user.id,
+      projectIds: [firstProject.id, secondProject.id, thirdProject.id],
+      percentages: [20, 40, 40],
+    });
+
+    await setSingleBoosting({
+      userId: user.id,
+      projectId: firstProject.id,
+      percentage: 0,
+    });
+    const [userPowerBoostings] = await findPowerBoostings({
+      userId: user.id,
+      orderBy: {
+        field: 'updatedAt',
+        direction: 'ASC',
+      },
+    });
+
+    assert.equal(userPowerBoostings.length, 2);
+
+    assert.isOk(
+      userPowerBoostings.find(
+        powerBoosting =>
+          powerBoosting.project.id === secondProject.id &&
+          powerBoosting.percentage === 50,
+      ),
+    );
+    assert.isOk(
+      userPowerBoostings.find(
+        powerBoosting =>
+          powerBoosting.project.id === thirdProject.id &&
+          powerBoosting.percentage === 50,
+      ),
+    );
+  });
+  it('should set single boosting with 0%', async () => {
+    const user = await saveUserDirectlyToDb(generateRandomEtheriumAddress());
+    const firstProject = await saveProjectDirectlyToDb(createProjectData());
+
+    await setSingleBoosting({
+      userId: user.id,
+      projectId: firstProject.id,
+      percentage: 100,
+    });
+
+    await cancelProjectBoosting({
+      userId: user.id,
+      projectId: firstProject.id,
+    });
+    const [userPowerBoostings] = await findPowerBoostings({
+      userId: user.id,
+      orderBy: {
+        field: 'updatedAt',
+        direction: 'ASC',
+      },
+    });
+
+    assert.equal(userPowerBoostings.length, 0);
+  });
+  it('should get error when set single boosting with something between 0-100', async () => {
+    const user = await saveUserDirectlyToDb(generateRandomEtheriumAddress());
+    const firstProject = await saveProjectDirectlyToDb(createProjectData());
+    await assertThrowsAsync(async () => {
+      await setSingleBoosting({
+        userId: user.id,
+        projectId: firstProject.id,
+        percentage: 70,
+      });
+    }, errorMessages.ERROR_GIVPOWER_BOOSTING_FIRST_PROJECT_100_PERCENT);
+  });
+}
+
 function powerBoostingSnapshotTests() {
   it('should take snapshot of power boosting', async () => {
     await PowerBoosting.clear();
diff --git a/src/repositories/powerBoostingRepository.ts b/src/repositories/powerBoostingRepository.ts
index fd379db74..cbda3ba29 100644
--- a/src/repositories/powerBoostingRepository.ts
+++ b/src/repositories/powerBoostingRepository.ts
@@ -11,7 +11,6 @@ import {
 import { PowerSnapshot } from '../entities/powerSnapshot';
 import { getRoundNumberByDate } from '../utils/powerBoostingUtils';
 import { getKeyByValue } from '../utils/utils';
-import { Reaction } from '../entities/reaction';
 
 const MAX_PROJECT_BOOST_LIMIT = Number(
   process.env.GIVPOWER_BOOSTING_USER_PROJECTS_LIMIT || '20',
@@ -125,12 +124,30 @@ export const insertSinglePowerBoosting = async (params: {
   }).save();
 };
 
+export const cancelProjectBoosting = async (params: {
+  userId: number;
+  projectId: number;
+}): Promise<PowerBoosting[]> =>
+  _setSingleBoosting({
+    ...params,
+    percentage: 0,
+    projectIsCanceled: true,
+  });
+
 export const setSingleBoosting = async (params: {
   userId: number;
   projectId: number;
   percentage: number;
+}): Promise<PowerBoosting[]> =>
+  _setSingleBoosting({ ...params, projectIsCanceled: false });
+
+const _setSingleBoosting = async (params: {
+  userId: number;
+  projectId: number;
+  percentage: number;
+  projectIsCanceled: boolean;
 }): Promise<PowerBoosting[]> => {
-  const { userId, projectId, percentage } = params;
+  const { userId, projectId, percentage, projectIsCanceled } = params;
 
   if (percentage < 0 || percentage > 100) {
     throw new Error(
@@ -161,7 +178,7 @@ export const setSingleBoosting = async (params: {
     const commitData: PowerBoosting[] = [];
 
     if (otherProjectsPowerBoostings.length === 0) {
-      if (percentage !== 100)
+      if (percentage !== 100 && !projectIsCanceled)
         throw new Error(
           i18n.__(
             translationErrorMessagesKeys.ERROR_GIVPOWER_BOOSTING_FIRST_PROJECT_100_PERCENT,
diff --git a/src/services/powerBoostingService.test.ts b/src/services/powerBoostingService.test.ts
index 5aa4c0a01..358bf89d8 100644
--- a/src/services/powerBoostingService.test.ts
+++ b/src/services/powerBoostingService.test.ts
@@ -51,4 +51,25 @@ function changeUserBoostingsAfterProjectCancelledTestCases() {
     assert.equal(secondUserBoostings[0].percentage, 100);
     assert.equal(secondUserBoostings[0].projectId, firstProject.id);
   });
+  it('should change user percentage to zero when project cancelled, even when just has 1 boositng', async () => {
+    const user1 = await saveUserDirectlyToDb(generateRandomEtheriumAddress());
+    const projectThatWouldGetCancelled = await saveProjectDirectlyToDb(
+      createProjectData(),
+    );
+    await setMultipleBoosting({
+      userId: user1.id,
+      projectIds: [projectThatWouldGetCancelled.id],
+      percentages: [100],
+    });
+
+    await changeUserBoostingsAfterProjectCancelled({
+      projectId: projectThatWouldGetCancelled.id,
+    });
+
+    // Changing percentages is async we sleep some milli seconds to make sure all updates has been done
+    await sleep(100);
+    const firstUserBoostings = await findUserPowerBoosting(user1.id);
+
+    assert.equal(firstUserBoostings.length, 0);
+  });
 }
diff --git a/src/services/powerBoostingService.ts b/src/services/powerBoostingService.ts
index a96a6e089..3b10a4145 100644
--- a/src/services/powerBoostingService.ts
+++ b/src/services/powerBoostingService.ts
@@ -1,6 +1,6 @@
 import {
+  cancelProjectBoosting,
   findPowerBoostings,
-  setSingleBoosting,
 } from '../repositories/powerBoostingRepository';
 
 export const changeUserBoostingsAfterProjectCancelled = async (params: {
@@ -12,10 +12,9 @@ export const changeUserBoostingsAfterProjectCancelled = async (params: {
     projectId,
   });
   powerBoostings.forEach(powerBoosting =>
-    setSingleBoosting({
+    cancelProjectBoosting({
       userId: powerBoosting.userId,
       projectId,
-      percentage: 0,
     }),
   );
 };